Packaging bag

Abstract

To provide a packaging bag which is not easily deformed and has an excellent self-supporting property in a state of being a package.SOLUTION: A packaging bag comprises: a barrel part 1a constituted by a pair of sheets 2, 3 made into a cylindrical shape by side joint parts 5, 5 on both side parts; and a bottom gazette part 1b constituted by a bottom gazette sheet 4. In at least one sheet of the pair of sheets 2, 3, a sheet higher in rigidity than the bottom gazette sheet 4 is provided on the whole or a part of an area divided into a plurality of parts in a height direction. The sheet having high rigidity is, for example, a paper sheet. By providing the sheet having high rigidity on the barrel part, the packaging bag which is not easily deformed and has an excellent self-supporting property in a state of being a package is made.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a self - standing packaging bag.

Background Art

[0002] This type of packaging bag has, for example, as shown in Patent Documents 1 and 2, a cylindrical body portion and a bottom gusset portion. In a state where no contents are contained, it is flat, but when the contents are contained, the bottom gusset portion opens to form a three - dimensional shape and becomes a self - standing packaging bag. This type of packaging bag is also called a stand - up bag or a standing pouch.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] This type of packaging bag is made of a plastic sheet. However, the plastic sheet does not have sufficient rigidity. For this reason, this type of packaging bag has a problem that it is easily deformed and does not necessarily have good self - standing property. Also, when it is deformed, when it is displayed in a store such as a convenience store, it looks bad and the commercial value is impaired.

[0005] Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging bag that is difficult to deform and has excellent self - standing property in a packaged state.

Means for Solving the Problems

[0006] First The packaging bag according to the present invention is A packaging bag comprising a body portion composed of a pair of sheets formed into a cylindrical shape by side joint portions on both sides, and a bottom gusset portion composed of a bottom gusset sheet, The body portion is, at a height position corresponding to the storage part inside the packaging bag A tape that is adhered over the entire width of the sheet to the inner surface of one of the pair of sheets and serves as opening guide means for guiding the direction of opening at the edge on the bottom gusset portion side, a tape that is not adhered to the inner surface except for the side joint part of either one of the pair of sheets and, An opening notch formed in a position on the bottom gusset portion side of the side joint portion, near the end of the tape and at a height position higher than that of the tape, A venting portion formed in a region of the side joint portion where the end of the tape is located, a vent part formed by making the region where the end of the tape is located non-joined among the side joint parts and is provided with, At least one of the pair of sheets is provided with a sheet having higher rigidity than the bottom gusset sheet, either entirely or in a part of a region divided into a plurality in the height direction, It is a packaging bag. The packaging bag according to the second aspect of the present invention a packaging bag including a body part composed of a pair of sheets formed into a cylindrical shape by side joint parts on both sides, and a bottom gusset part composed of a bottom gusset sheet The body part is at a height position corresponding to the storage part inside the packaging bag a tape that is adhered over the entire width of the sheet to the inner surface of either one of the pair of sheets and serves as opening guide means for guiding the direction of opening at the edge on the bottom gusset part side, and is not adhered to the inner surface except for the side joint part of either one of the pair of sheets an opening notch formed in a position near the end of the tape and on the bottom gusset part side rather than the height position of the tape among the side joint parts a vent part formed in the region where the end of the tape is located among the side joint parts, the vent part being formed by making the outer surface of the end of the tape and the inner surface of either one of the pair of sheets non-joined or weakly joined At least one of the pair of sheets includes a sheet having higher rigidity than the bottom gusset sheet in all or a part of the region divided into a plurality in the height direction It is a packaging bag The packaging bag according to the third aspect of the present invention a packaging bag including a body part composed of a pair of sheets formed into a cylindrical shape by side joint parts on both sides, and a bottom gusset part composed of a bottom gusset sheet The body part is at a height position corresponding to the storage part inside the packaging bag a tape that is adhered over the entire width of the sheet to the inner surface of either one of the pair of sheets and serves as opening guide means for guiding the direction of opening at the edge on the bottom gusset part side, and is not adhered to the inner surface except for the side joint part of either one of the pair of sheets an opening notch formed in a position near the end of the tape and on the bottom gusset part side rather than the height position of the tape among the side joint parts a vent part formed in the region where the end of the tape is located among the side joint parts, the vent part being formed by making the region where the end of the tape is located a narrow part among the side joint parts At least one of the pair of sheets is provided with a sheet having higher rigidity than the bottom gasket sheet, either entirely or as part of a region divided into a plurality in the height direction. It is a packaging bag.

[0007] Here, as an aspect of the packaging bag according to the present invention, The sheet having high rigidity is a paper sheet, The bottom gusset sheet is a plastic sheet A configuration with [something] can be adopted.

[0008] Also, as another aspect of the packaging bag according to the present invention, The tape is One of the pair of sheets, attached to a sheet with high rigidity A configuration with [something] can be adopted.

Advantages of the Invention

[0014] According to the present invention, by providing a sheet with high rigidity in the body portion, there is an effect of a packaging bag that is difficult to lose its shape and has excellent self-standing property in the packaged state.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Hereinafter, as an embodiment of the packaging bag according to the present invention, a packaging bag that is self-standing and suitable for packaging food that can be heated using heating means such as a microwave oven will be described with reference to FIGS. 1 to 3.

[0017] As shown in FIG. 1, the packaging bag 1 is configured to include a pair of sheets (a first sheet 2 and a second sheet 3) and a bottom gusset sheet 4. The sheets 2 and 3 have a rectangular shape (a rectangular shape) in which the lower left and right corners are diagonally cut out, and are the sheets that form the body portion 1a. The bottom gusset sheet 4 is folded in half and inserted between the lower portions of the sheets 2 and 3 so that the folded portion (the convex portion) faces upward, and is the sheet that forms the bottom gusset portion 1b.

[0018] The sheets 2 and 3 have a shape in which the ratio (W1 / H1) of the width W1 to the height H1 is 0.7 or more. Further, the ratio (H2 / H1) of the height H2 of the bottom gusset sheet 4 folded in half (H2 is half of the width of the bottom gusset sheet 4) to the height H1 of the sheets 2 and 3 is set in the range of 0.05 or more and 0.4 or less. In the present embodiment, the height H1 is 140 mm, the width W1 is 150 mm, and the height H2 is 40 mm. However, these numerical ranges and numerical values are merely examples.

[0019] Sheets 2 and 3 are made of paper, unbleached kraft paper, Japanese paper, mixed paper, synthetic paper, glassine paper, paper-like materials (collectively referred to as "paper"), or sheets (films) mainly composed of these (collectively referred to as "paper sheets" (films)). The paper may be paper containing bio-based polyethylene terephthalate (bio-based PET, so-called bio-PET). Sheets 2 and 3 have heat weldability on the inner surface side entirely or partially at necessary locations as required. For example, sheets 2 and 3 are laminated sheets (films) with a paper outer layer and a plastic sheet (film) inner layer. As one form of the laminated sheet (film), sheets 2 and 3 are formed by laminating a base material layer, an adhesive layer, and a resin layer in order from the outer surface side. Paper is used as the base material layer. As the adhesive layer, dry lamination, extrusion lamination, etc. are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. As an example, the base material layer is paper with a basis weight of about 21 g / m 2 ². The adhesive layer is dry lamination, and the resin layer is biaxially oriented polypropylene (OPP). As another example, the base material layer is oil-resistant paper with a basis weight of about 38 g / m 2 ². The adhesive layer is an extrusion lamination of polyethylene (PE), and the resin layer is cast polypropylene (CPP). Note that "sheet" is not defined by thickness and is a concept including films (the same applies hereinafter).

[0020] Alternatively, the sheets 2 and 3 are made of ordinary cellophane, moisture-proof cellophane, cellophane-like or cellophane-like materials (collectively referred to as "cellophane"), or sheets (films) mainly composed of these (collectively referred to as "cellophane sheets" (films)). The sheets 2 and 3 have heat sealability on the inner surface side, either entirely or partially at required locations, as necessary. For example, the sheets 2 and 3 are laminated sheets (films) with cellophane as the outer layer and a plastic sheet (film) as the inner layer. As one form of the laminated sheet (film), the sheets 2 and 3 are formed by laminating a base material layer, an adhesive layer, and a resin layer in that order from the outer surface side. Cellophane is used as the base material layer. As the adhesive layer, dry lamination, extrusion lamination, etc. are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. As an example, the base material layer is ordinary cellophane or moisture-proof cellophane, the adhesive layer is dry lamination, and the resin layer is biaxially stretched polypropylene (OPP).

[0021] The bottom gusset sheet 4 is a plastic sheet (film) having heat weldability such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. As an example, the bottom gusset sheet 4 is a biaxially oriented polypropylene (OPP) sheet (film) or an unoriented polypropylene (CPP) sheet (film). Alternatively, the bottom gusset sheet 4 is a laminated sheet (film). As one form of the laminated sheet (film), the bottom gusset sheet 4 is formed by laminating a base material layer, an adhesive layer, and a resin layer in order from the outer surface side. As the base material layer, resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE) are used. As the adhesive layer, dry lamination, extrusion lamination, etc. are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. As an example, the base material layer is polyethylene terephthalate (PET), the adhesive layer is dry lamination, and the resin layer is unoriented polypropylene (CPP). Note that the polypropylene sheet (film) is a concept that includes not only a polypropylene sheet (film) with a purity of 100%, but also a sheet (film) containing polypropylene as a main component and other components (for example, other resin components such as polyethylene).

[0022] The packaging bag 1 has its left and right side portions and the bottom joined together (side joining portions 5, 5 and bottom joining portion 6), has an opening 7 at the upper part, and has a storage portion inside. The opening 7 serves as a filling port for the contents. When the contents are stored (filled) in the storage portion, the upper part of the packaging bag 1 is joined to form a package.

[0023] The side joining portion 5 is formed by welding in a band shape along the outer edge of the overlapping portion of the left and right side edges of the sheets 2 and 3 (at the lower part of the sheets 2 and 3, the overlapping portion of the left and right inclined side edges of the lower part of the sheet 2 and one of the left and right inclined side edges of the bottom gusset sheet 4 folded in half, and the overlapping portion of the left and right inclined side edges of the lower part of the sheet 3 and the other of the left and right inclined side edges of the bottom gusset sheet 4 folded in half).

[0024] The bottom joint 6 is formed by welding the overlapping parts of the lower edge of the sheet 2 and one of the folded lower edges of the bottom gasket sheet 4, and the overlapping parts of the lower edge of the sheet 3 and the other folded lower edge of the bottom gasket sheet 4 in a strip shape along the outer edge of the overlapping parts.

[0025] Even if the lower inclined parts 5a, 5a of the left and right side joints 5, 5 and the bottom joint 6 are formed, the outer surfaces of the two-folded bottom gasket sheet 4 are not joined. Therefore, in the packaging bag 1, the bottom gasket sheet 4 can be opened and unfolded flat.

[0026] Openable notches 8 are provided in the left and right side joints 5, 5. The left and right notches 8, 8 are provided at the same height position H3. The ratio (H3 / H1) of the height position H3 of the notches 8, 8 to the height H1 of the sheets 2, 3 is set in the range of 0.4 or more and 0.9 or less.

[0027] In the vicinity of the notches 8, 8 and on the opening 7 side of the height position H3 of the notches 8, 8, a narrow tape 9 is provided along the width direction of the sheet 2. The tape 9 is provided across the left and right side edges of the sheet 2 and crosses the sheet 2 in the width direction. The tape 9 is adhered to the inner surface of the sheet 2 over the entire width.

[0028] The tape 9 has a strength that it will not break even when a force is applied during the opening of the package starting from the notch 8. The tape 9 is a plastic sheet (film) having heat weldability such as biaxially stretched polyester or polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), etc., cut into a narrow strip. As an example, the tape 9 has a thickness of 10 μm or more, or 20 μm or more, and 30 μm or less, or 40 μm or less. Also, the tape 9 has a width of 1.5 mm or more, or 2 mm or more, and 4 mm or less, or 3 mm or less.

[0029] In the region of the side joint portion 5 where the end of the tape 9 is located, a steam vent portion 10 is formed. The steam vent portion 10 is for discharging the steam inside the package to the outside when heating the contents (food) in the package in a microwave oven. The steam vent portion 10 can adopt various forms.

[0030] The steam vent portion 10 shown in FIGS. 1, 2(a) and 2(b) is formed by making the region of the side joint portion 5 where the end of the tape 9 is located non-joined. The both side edges of the non-joined portion are lines along the longitudinal direction of the tape 9, that is, the width direction of the sheets 2 and 3. The width of the non-joined portion in the height direction of the sheets 2 and 3 is larger than the width of the tape 9. The non-joined portion is formed in the vicinity of the notch 8.

[0031] The steam vent portion 10 shown in FIGS. 2(c) and 2(d) is formed by making the outer surface 9a of the end of the tape 9 and the inner surface of the other sheet 3 non-joined or weakly joined. The methods for making non-joined are: i) making the region not subjected to the joining process (for example, using a heat-sealing bar with a relief portion so that the region is not heat-sealed), ii) using a tape 9 whose outer surface 9a does not have heat-sealing property or a tape 9 that does not have heat-sealing property with the inner surface of the other sheet 3. The methods for making weakly joined are: iii) making the joining process of the region a weak joining (for example, using a heat-sealing bar that makes the region a weak seal), iv) using a tape 9 whose outer surface 9a has weak heat-sealing property or a tape 9 that has weak heat-sealing property with the inner surface of the other sheet 3, v) applying a coating agent (partial coating agent) such as a heat-sensitive adhesive to the outer surface 9a of the tape 9 or the inner surface of the other sheet 3 in the region.

[0032] The steam vent portion 10 shown in FIGS. 2(e) and (f) is formed by making the region where the end of the tape 9 is located in the side joint portion 5 a narrow portion 5b. The narrow portion 5b is formed by displacing a part of the inner edge of the side joint portion 5 to the outer edge side (FIG. 2(e)), or by displacing a part of the outer edge of the side joint portion 5 to the inner edge side (FIG. 2(f)). These are formed, for example, by using a heat-sealing bar having a relief portion so that the region is not heat-sealed.

[0033] The packaging bag 1 according to the present embodiment has the above configuration. As shown in FIG. 3(a), after the contents (food) are stored in the storage portion in the packaging bag 1, the upper portion of the packaging bag 1 is joined (upper joint portion 11) to form a package. The upper joint portion 11 is formed by welding the overlapping portions of the upper edges of the sheets 2 and 3 in a strip shape along the outer edge of the overlapping portion.

[0034] As described above, according to the packaging bag 1 according to the present embodiment, a paper sheet or a cellophane sheet, which is a different material from the plastic sheet and has higher rigidity than the plastic sheet, is used for the body portion 1a, and the body portion 1a is given a waist. For this reason, in the state of being a package, there is an effect that it is difficult to lose its shape and it has excellent self-standing property. Further, for this reason, when it is displayed in a store such as a convenience store, a beautiful appearance can be maintained and the purchasing desire of customers can be aroused. Note that rigidity refers to the property of being difficult to deform when a bending, torsional, or compressive force is applied from the outside. Expressions such as having a waist or not, being hard or soft are also used.

[0035] Further, according to the packaging bag 1 according to the present embodiment, the height H1 of the packaging bag 1 is 145 mm or less, the ratio (W1 / H1) of the width W1 of the packaging bag 1 to the height H1 of the packaging bag 1 is 0.7 or more, and the ratio (H2 / H1) of the height H2 (= half of the width of the bottom gusset sheet 4) of the bottom gusset sheet 4 to the height H1 of the packaging bag 1 is set in the range of 0.05 or more and 0.4 or less. For this reason, in the state of being a package, there is an effect that it has a low center of gravity, a wide bottom, and excellent self-standing stability.

[0036] Further, according to the packaging bag 1 according to the present embodiment, a plastic sheet that is softer than a paper sheet or a cellophane sheet is used for the bottom gusset portion 1b. Therefore, the opening state of the bottom of the packaging bag 1 can be improved.

[0037] Further, according to the packaging bag 1 according to the present embodiment, by using a paper sheet or a cellophane sheet, the amount of plastic used can be reduced. In recent years, waste plastic has become a global environmental problem, and this is an effective measure against this environmental problem.

[0038] When it is desired to heat and eat the food, the package is heated, for example, in a microwave oven. When placed in a microwave oven, the moisture in the food becomes steam, and the internal pressure of the packaging bag 1 increases. As shown in Fig. 3(a), when the internal pressure increases due to heating by a microwave oven, the steam can escape to the outside from the left and right steam vents 10, 10 or one of the steam vents 10, and it is possible to prevent the packaging bag from bursting.

[0039] Opening is performed starting from the notch 8. The direction from the notch 8 toward the side joint portion 5 on the opposite side becomes the cutting planned line of the sheets 2 and 3, and the tape 9 is arranged along this cutting planned line. Therefore, even if the cutting of the sheets 2 and 3 accompanying the opening is likely to deviate from the cutting planned line, the tape 9 can prevent the deviation. In particular, since the sheets 2 and 3 of a paper sheet or a cellophane sheet may not have good cutting directivity (linear cutability) in the width direction, opening guide means such as the tape 9 is effective for forming a clean opening.

[0040] As shown in Fig. 3(b), the package after opening can also stand on its own and can be used as a container as it is. Moreover, as described above, since the bottom of the package is wide, accordingly, the opening also opens wide. Therefore, there is an effect that it is easy to take out the food in the package.

[0041] Note that the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0042] In the above-described embodiment, the bottom gusset sheet 4 folded in half is inserted between the lower portions of the sheets 2 and 3 to form the bottom joint portion 6. In actuality, for continuous production, the sheets 2 and 3 and the bottom gusset sheet 4 are in the form of a long sheet web that is conveyed within the bag-making apparatus. For this reason, the inner surface of the lower edge portion of the sheet 2 and the inner surface of one of the lower edge portions of the bottom gusset sheet 4 folded in half are overlapped in a clasped shape, and the inner surface of the lower edge portion of the sheet 3 and the inner surface of the other lower edge portion of the bottom gusset sheet 4 folded in half are overlapped in a clasped shape. However, the present invention is not limited thereto. For example, as shown in FIG. 4, the inner surface of the lower edge portion of the sheet 2 and the outer surface of one of the lower edge portions of the bottom gusset sheet 4 folded in half are overlapped in an envelope shape, and the inner surface of the lower edge portion of the sheet 3 and the outer surface of the other lower edge portion of the bottom gusset sheet 4 folded in half are overlapped in an envelope shape, and the bottom gusset sheet 4 may be inserted between the lower portions of the sheets 2 and 3. In actual continuous production, an integrated sheet web in which the web of the bottom gusset sheet 4 is interposed between the webs of the sheets 2 and 3 is used, and after the web of the bottom gusset sheet 4 is halved at the central position in the width direction, the web of the bottom gusset sheet 4 is folded between the webs of the sheets 2 and 3.

[0043] Also, in the above-described embodiment, both of the sheets 2 and 3 are paper sheets or cellophane sheets. However, the present invention is not limited thereto. For example, as shown in FIG. 5, one of the sheets (sheet 3 in FIG. 5(b)) may be a paper sheet or a cellophane sheet, and the other sheet (sheet 2 in FIG. 5(a)) may be a plastic sheet.

[0044] In the above-described embodiment, all of the sheets 2 and 3 are paper sheets or cellophane sheets. However, the present invention is not limited thereto. For example, as shown in FIG. 6, a sheet (sheet 2 in the illustrated example) is divided into a plurality of regions in the height direction (three stages of upper, middle, and lower stages in the illustrated example), and paper sheets or cellophane sheets are used for some regions (upper and lower stages in the illustrated example) (upper sheet 2A and lower sheet 2C), and a plastic sheet may be used for other regions (middle stage in the illustrated example) (middle sheet 2B). The number of divided regions, whether to use a paper sheet or a cellophane sheet or a plastic sheet for each region, and whether to adopt such a combined sheet for sheet 2, sheet 3, or both sheets 2 and 3 can be appropriately selected.

[0045] In the above-described embodiment, as the opening guide means for guiding the direction of opening, a tape 9 is provided. This tape 9 is also a means for forming the steam vent portion 10. However, the present invention is not limited thereto. For example, as shown in FIG. 7(a), the tape is not essential. Note that the steam vent portion 10 does not necessarily have to be formed in the vicinity of the notch 8 for opening, but is preferably formed on the opening 7 side rather than the height position H3 of the notch 8.

[0046] In the above-described embodiment, the steam vent portion 10 is formed in the side joint portion 5. However, the present invention is not limited thereto. For example, as shown in FIG. 7(b), the steam vent portion 10 may be formed in the upper joint portion 11. When the content is a liquid or a fluid, if the steam vent portion 10 is composed of a non-joint portion, there is a risk of leakage. In this case, the steam vent portion 10 is formed by using the method of the weak joint described above.

[0047] In the present invention, the steam vent portion is not essential. That is, the present invention includes a self-supporting packaging bag, but also includes a packaging bag that is not heated using heating means such as a microwave oven.

[0048] Also, in the above-described embodiment, the notch 8 for opening is provided at the left and right side joint portions 5, 5. However, the present invention is not limited to this. The notch may be provided at either one of the side joint portions.

[0049] Also, in the above-described embodiment, the packaging body is in a form in which the upper part of the packaging bag 1 is joined and sealed by the upper joint portion 11. However, the packaging body may further be in a form in which the upper part of the sealed packaging bag is bent one or more times toward the bottom gusset portion side. Since the height position of the packaging body in this form can be lowered, it is effective when the height of the packaging bag is larger than the height inside the microwave oven and gets caught on the ceiling inside the oven.

Explanation of Reference Numerals

[0050] 1... packaging bag, 1a... body portion, 1b... bottom gusset portion, 2... first sheet, 2A... upper sheet, 2B... middle sheet, 2C... lower sheet, 3... second sheet, 4... bottom gusset sheet, 5... side joint portion, 5a... lower inclined portion, 5b... narrow portion, 6... bottom joint portion, 7... opening, 8... notch, 9... tape, 9a... outer surface, 10... venting portion, 11... upper joint portion, H1... height of the packaging bag, H2... height of the double-folded bottom gusset sheet, H3... height position of the notch, W1... width of the packaging bag

Claims

1. A packaging bag comprising a body portion composed of a pair of sheets formed into a cylindrical shape by side joint portions on both sides, and a bottom gusset portion composed of a bottom gusset sheet, The body portion is at a height position corresponding to the accommodating portion inside the packaging bag, A tape that is adhered across the entire width of the inner surface of one of the pair of sheets and serves as an opening guide means for guiding the direction of opening at the edge on the bottom gusset portion side, and the tape is not adhered to the inner surface of the other sheet of the pair of sheets except for the side joint portion, An opening notch formed in the side joint portion, near the end of the tape and at a position closer to the bottom gusset portion than the height position of the tape, A vent portion formed in the region of the side joint portion where the end of the tape is located, and the vent portion is formed by making the region of the side joint portion where the end of the tape is located non-joined, At least one of the pair of sheets includes a sheet having higher rigidity than the bottom gusset sheet in all or a part of a region divided into a plurality in the height direction Packaging bag.

2. A packaging bag comprising a body portion composed of a pair of sheets formed into a cylindrical shape by side joint portions on both sides, and a bottom gusset portion composed of a bottom gusset sheet, The body portion is at a height position corresponding to the accommodating portion inside the packaging bag, A tape that is adhered across the entire width of the inner surface of one of the pair of sheets and serves as an opening guide means for guiding the direction of opening at the edge on the bottom gusset portion side, and the tape is not adhered to the inner surface of the other sheet of the pair of sheets except for the side joint portion, An opening notch formed in the side joint portion, near the end of the tape and at a position closer to the bottom gusset portion than the height position of the tape, A vent portion formed in the region of the side joint portion where the end of the tape is located, and the vent portion is formed by making the outer surface of the end of the tape and the inner surface of the other sheet of the pair of sheets non-joined or weakly joined, At least one of the pair of sheets includes a sheet having higher rigidity than the bottom gusset sheet in all or a part of a region divided into a plurality in the height direction Packaging bag.

3. A packaging bag comprising a body portion composed of a pair of sheets formed into a cylindrical shape by side joint portions on both sides, and a bottom gusset portion composed of a bottom gusset sheet, The body portion is at a height position corresponding to the accommodating portion inside the packaging bag, A tape that serves as an opening guide means that is attached across the entire width of a sheet to the inner surface of either one of a pair of sheets and guides the direction of opening at the edge on the bottom gusset portion side, and the tape is not attached to the inner surface of either one of the pair of sheets except for the side joint portion. Among the side joint portions, an opening notch formed at a position near the end of the tape and on the bottom gusset portion side from the height position of the tape. Among the side joint portions, a vent portion formed in the region where the end of the tape is located, and the vent portion is formed by making the region where the end of the tape is located in the side joint portion a narrow portion. At least one of the pair of sheets includes a sheet having higher rigidity than the bottom gusset sheet in all or a part of a region divided into a plurality in the height direction. Packaging bag.

4. The sheet having higher rigidity is a paper sheet. The bottom gusset sheet is a plastic sheet. The packaging bag according to any one of claims 1 to 3.

5. The tape is one of the pair of sheets and is attached to the sheet having higher rigidity. The packaging bag according to any one of claims 1 to 3.

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