JP7469659B2 - Packaging Bag - Google Patents

Description

The present invention relates to a self-supporting packaging bag for use in a microwave oven, in which a flexible film is formed into a bag shape.

There are known packaging bags filled with contents such as retort food, which can be heated in a microwave oven or the like while standing upright. For example, the packaging bag in Patent Document 1 has excellent self-standing stability, making it effective for displaying in stores.

JP 2005-306426 A

On the other hand, it is possible to use the container-shaped main body obtained by removing the cut-out portion above the opening portion as tableware when eating the contents. In such cases, there is a problem that it is difficult to open when opened.

The present invention was made in consideration of these circumstances, and aims to provide a packaging bag for use in a microwave oven that is easy to open and highly convenient for users.

According to the present invention, there is provided a self-supporting packaging bag for a microwave oven, in which a flexible film is formed into a bag shape, the packaging bag having a bottom portion and a peripheral portion provided to rise from the bottom portion, the peripheral portion having a front portion and a back portion opposed to each other, the bottom portion, the front portion and the back portion being welded together to form the bag shape, the packaging bag being configured so that the central lower end, which is the lower end of the central portion in the left-right direction of the packaging bag, opens more in the front-rear direction than the side lower ends, which are the lower ends of the side portions in the left-right direction, the packaging bag having a recessed portion at the central lower end, which is a portion recessed upward from a reference line along the side lower ends in a plan view.

With this configuration, when the container is opened, both left and right ends of the lower end are firmly in contact with the ground, and a load is applied to the left and right central portion of the lower end, causing the left and right ends to tilt inward. This brings the upper ends of the left and right ends closer to each other, causing the left and right central portion to expand in the front and back. In this way, the container is easier to open when opened, improving convenience for the user.

Various embodiments of the present invention will be described below. The embodiments described below can be combined with each other.
Preferably, the recessed portion is formed in a curved shape.
Preferably, the recessed portion is formed in a trapezoidal shape.
Preferably, when the length of the packaging bag in the left-right direction is L1 and the length of the recessed portion in the left-right direction is L, L/L1≧0.5.
Preferably, the peripheral portion is provided with an opening portion for opening the packaging bag, and when the length from the lower end of the packaging bag to the opening portion is H1 and the vertical length of the recessed portion is H, H/H1 ≧ 0.05.

Fig. 1A is a perspective view of a packaging bag 1 according to a first embodiment of the present invention in which contents are contained, and Fig. 1B is a perspective view of the packaging bag 1 in an opened state. FIG. 2 is a plan view of the packaging bag 1 of FIG. 1 . A perspective view of the bottom film 20a that constitutes the bottom portion 2. Fig. 4A is a side view of the peripheral wall film 20b, and Fig. 4B is a diagram showing a state in which a part of the peripheral wall film 20b has been cut and the bottom film 20a has been inserted into the cut portion. 1A and 1B are diagrams showing how the packaging bag 1 is manufactured by welding the peripheral wall film 20b and the bottom film 20a. Fig. 6A is an enlarged view of the bottom portion 2 in a state where the lower end of the central portion of the packaging bag 1 is widely opened in the front-rear direction. Fig. 6B is a detailed view of the vicinity of the lower end of the packaging bag 1 in Fig. 2. Fig. 7A is a perspective view of a packaging bag P as a comparative example in an opened state. Fig. 7B is a perspective view of a packaging bag 1 in an opened state. FIG. 11 is a plan view showing a packaging bag 1 according to a second embodiment.

The following describes the embodiments of the present invention. The various features shown in the embodiments below can be combined with each other. In addition, each feature can be an invention independently.

<1. First embodiment>
(1-1. Configuration of packaging bag 1)
As shown in Figures 1 and 2, a packaging bag 1 in an embodiment of the present invention is a self-supporting packaging bag for a microwave oven in which a flexible film is formed into a bag shape. The packaging bag 1 has a bottom portion 2 and a peripheral portion 21 provided to rise from the bottom portion 2. The peripheral portion 21 has a front portion 3 and a back portion 4 opposed to each other. The front portion 3 and the back portion 4 are welded to each other at their left and right ends (hereinafter also referred to as side ends). The bottom portion 2 is welded (heat sealed) to the front portion 3 and the back portion 4. In this way, the bottom portion 2, the front portion 3, and the back portion 4 are welded to each other, and the film is formed into a bag shape.

In this disclosure, the top, bottom, left and right of FIG. 2 will be described as the top, bottom, left and right of the packaging bag 1. Specifically, the bottom portion 2 side will be the lower side, and the front portion 3 (and back portion 4) side will be the upper side. In addition, the left and right sides when the front portion 3 is placed in front will be the left and right sides of the packaging bag 1. Furthermore, the front portion 3 side will be the front side, and the back portion 4 side will be the rear side.

The front surface 3 has a lower front surface 3a and an upper front surface 3b. The lower front surface 3a is welded to the bottom surface 2. The lower front surface 3a and the upper front surface 3b are folded over each other and welded to each other at a joint portion 10 formed by overlapping the inner surfaces of the lower front surface 3a and the upper front surface 3b.

The peripheral surface portion 21 of the packaging bag 1 is provided with an opening portion 24. The opening portion 24 is a portion for opening the packaging bag 1, and in this embodiment, the opening portion 24 includes a tear initiation portion 24a which is a starting point for tearing the peripheral surface portion 21, and a cut line 24b on which a line is printed indicating the portion to cut out to open the packaging bag 1. The packaging bag 1 may be opened by tearing the peripheral surface portion 21 starting from the tear initiation portion 24a, or by cutting the peripheral surface portion 21 along the cut line 24b using a cutting tool such as scissors.

The tear initiation portion 24a is a portion that makes it easy to tear the peripheral portion 21, and is formed, for example, by a notch or cut. One of the tear initiation portion 24a and the cut line 24b can be omitted. The opening portion 24 may also have another configuration that allows the packaging bag 1 to be opened. For example, instead of the cut line 24b, a half-cut line extending in the circumferential direction of the peripheral portion 21 may be provided, or a strip-shaped film may be arranged to extend in the circumferential direction of the peripheral portion 21. The strip-shaped film is welded to the peripheral portion 21, and by grasping and pulling the end of the strip-shaped film, it is possible to tear the peripheral portion 21 along the strip-shaped film.

The packaging bag 1 has an upper cutout portion 5 and a lower main body portion 6 in the vertical direction, with the opening portion 24 as the boundary. The container-shaped main body portion 6 is obtained by tearing the peripheral surface portion 21 in the circumferential direction at the opening portion 24 and removing the cutout portion 5 above the opening portion 24. As shown in FIG. 1B, an opening 7 is formed in the main body portion 6. The main body portion 6 is used as a dish to eat the contents of the packaging bag 1.

The opening section 24 is located closer to the bottom section 2 than the joint section 10. In other words, the joint section 10 is located at the cutout section 5. Therefore, when the cutout section 5 is removed during opening, the joint section 10 is also removed. Therefore, the joint section 10 does not get in the way when eating the contents.

Figure 2 is a diagram showing the packaging bag 1 in a plan view. A plan view means that the packaging bag 1 is flattened without any contents and viewed from a direction perpendicular to the front portion 3 of the packaging bag 1. As shown in Figure 2, the packaging bag 1 is formed so as to be linearly symmetrical with respect to a center line in the left-right direction.

The packaging bag 1 is formed with a steam release seal portion 11. The steam release seal portion 11 is provided at the joint portion 10. The steam release seal portion 11 is a welded portion with a lower weld strength than other welded portions. When the internal pressure of the packaging bag 1 increases due to steam generated inside the packaging bag 1 by heating the packaging bag 1, a steam flow path is formed in the steam release seal portion 11. The steam inside the packaging bag 1 is discharged to the outside through the steam release seal portion 11.

The vertical length H1 of the main body 6 (i.e., the length from the bottom end of the packaging bag to the opening portion 24) is, for example, 6 to 14 cm, preferably 12 cm or less, and more preferably 10 cm or less. If it is greater than this, it becomes difficult to remove the contents. Specifically, H1 is, for example, 6, 7, 8, 9, 10, 11, 12, 13, or 14 cm, and may be within a range between any two of the numerical values exemplified here.

Furthermore, the length H1 is preferably longer than the length H3 from the center line E to the bottom end of the bottom film 20a, and more preferably is at least 2 cm longer than H3. The value of (H1-H3) is, for example, 2 to 8 cm, specifically, for example, 2, 3, 4, 5, 6, 7, or 8 cm, and may be within a range between any two of the values exemplified here.

The vertical length H2 of the cutout portion 5 can be, for example, 6 to 10 cm. Specifically, H2 can be, for example, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, or 10 cm, and may be within a range between any two of the values exemplified here.

The packaging bag 1 has side end welds 12 at its side ends, which weld the front portion 3 and the back portion 4 together. This fixes the front portion 3 and the back portion 4 in the front-to-rear direction. Furthermore, the lower end of the packaging bag 1 has a lower end weld 13 at its lower end, which welds the bottom portion 2 and the front portion 3, and the bottom portion 2 and the back portion 4 together. As shown in FIG. 1A, when the contents are placed in the packaging bag 1, the upper end of the packaging bag 1 has an upper end weld 22 at its upper end, which welds the front portion 3 and the back portion 4 together.

The lower end welded portion 13 is the area below the center line E, and welds the bottom portion 2 to the front portion 3, and the bottom portion 2 to the back portion 4 at the side and bottom ends of the packaging bag 1 (areas surrounded by dashed lines in FIG. 2).

A recessed portion 25 that is recessed upward is formed in the center of the lower end welded portion 13 in the left-right direction (hereinafter also simply referred to as the center portion). The recessed portion 25 is formed in a curved shape. Details of the recessed portion 25 will be described later.

As shown in Figures 3 to 5, the packaging bag 1 is manufactured by inserting the bottom film 20a, which is folded into a V-shape at the center line E, between the front part 3 and the back part 4. Here, the length H3 from the center line E to the bottom end of the bottom film 20a is preferably 3 to 6 cm, and more specifically, is any one of the values of 3, 3.5, 4, 4.5, 5, 5.5, and 6 (unit: cm), and may also be within a range between any two of the numerical values exemplified here, for example, 4.5 cm. As mentioned above, the main body part 6 is preferably about this size because it is also used as tableware. A notch R is formed on both ends of the bottom film 20a.

The length r1 from the center line E of the bottom film 20a to the center of the notch R is preferably 1 to 3 cm, and more specifically, is any of the values 1, 1.5, 2, 2.5, or 3 (unit: cm), and may also be within a range between any two of the values exemplified here, for example, 2.5 cm.

The diameter of the notch R is preferably 1 to 4 cm, more specifically, any of the values 1, 1.5, 2, 2.5, 3, 3.5, or 4 (unit: cm), and may also be within a range between any two of the values exemplified here, for example, 2 cm.

The manufacturing procedure for the packaging bag 1 is briefly explained below with reference to Figures 4 and 5.

First, as shown in FIG. 4A, the inner surfaces of the ends of one peripheral wall film 20b are overlapped to form an overlapping portion 10a, and as shown in FIG. 4B, the overlapping portion 10a is welded to form a joint portion 10, and the remaining portion forms an elliptical ring C.

Next, as shown in Figures 4A to 4B, one end C1 of the ring C is cut and a bottom film 20a bent into a V shape is inserted. Next, as shown in Figures 4B to 5, the bottom film 20a and the peripheral wall film 20b are welded together and the other end C2 of the ring C is cut off to form the bottom portion 2, the front portion 3, and the back portion 4.

Here, the bottom film 20a and the peripheral wall film 20b are preferably laminated films having a base layer and a sealant layer, and it is even more preferable to have an adhesive layer and a printing layer between the base layer and the sealant layer.

The base layer is arranged so as to be exposed on the outer surface of the packaging bag 1, and the sealant layer is arranged so as to be exposed on the inner surface of the packaging bag 1. The sealant layers are welded (heat sealed) together to form a welded portion.

The substrate layer is formed from a material that has excellent strength and high impact resistance. For example, polyamide, polyolefin, polyethylene, polyester, etc. can be used as the substrate layer. More specifically, stretched polyethylene terephthalate film, silica-deposited stretched polyethylene terephthalate film, alumina-deposited stretched polyethylene terephthalate film, stretched nylon film, stretched polypropylene film, polypropylene/ethylene-vinyl alcohol copolymer co-extruded co-stretched film, etc. can be used. As the film that constitutes the substrate layer, one that has linear cutability in the MD direction (the direction in which the film flows during production) is preferable.

The adhesive layer is a layer for bonding the base layer and the sealant layer together. The bonding method may be, for example, extrusion lamination using polyethylene or the like as an adhesive layer, or dry lamination using a polyvinyl acetate adhesive, a polyacrylic ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, an amino resin adhesive, an epoxy adhesive, a polyurethane adhesive, or the like as an adhesive.

The sealant layer can be formed from a resin with excellent weldability. The sealant layer can be formed from a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, or ethylene-propylene block copolymer, and more specifically, unstretched polypropylene or linear low-density polyethylene can be used. The film constituting the sealant layer is preferably one that has linear cutability in the MD direction.

An intermediate layer may be provided between the base layer and the sealant layer. The intermediate layer may be a film of polyethylene terephthalate, polyamide, polyethylene, polypropylene or other polyolefin, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, saponified ethylene-vinyl acetate copolymer, or the like, or a film of these coated with polyvinylidene chloride, or a film of silicon oxide, aluminum oxide, or other inorganic material vapor-deposited thereon, or a film of polyvinylidene chloride, or the like.

As shown in FIG. 6A, the packaging bag 1 is configured so that the lower end of the center in the left-right direction (hereinafter also referred to as the lower end of the center) opens more in the front-to-back direction than the lower ends of the sides in the left-right direction (hereinafter also referred to as the lower ends of the sides). This is because the front portion 3 and the back portion 4 are directly welded at the notch R (see FIG. 3) formed in the bottom film 20a, forming a fixing portion 15 that fixes the front portion 3 and the back portion 4 in the front-to-back direction. Note that as the lower end of the center opens in the front-to-back direction, the center line E of the bottom portion 2 is pulled downwardly of the packaging bag 1.

As shown in FIG. 6B, the bottom end welded portion 13 has a pair of sloped portions 13a and a central portion 13b. The sloped portions 13a are welded at an angle (diagonally) from the side ends of the packaging bag 1 toward the bottom end of the central portion. By providing the sloped portions 13a in this way, the distance from the center line E to the bottom end welded portion 13 gradually increases from the side ends toward the central portion in the left-right direction (W1<W2). This configuration can prevent pinholes from occurring at the bottom ends of the sides.

The central portion 13b is provided between a pair of the sloped portions 13a and is formed in a straight line. By providing the central portion 13b in a straight line, it becomes easier to use the main body portion 6 as tableware.

An air pocket 14 is provided on the outside of the sloped portion 13a. The air pocket 14 is formed in a triangular shape, and is a space in which air that could not be completely expelled to the outside by welding at the lower end welding portion 13 remains. By providing the air pocket 14, the remaining air in the lower end welding portion 13 is collected in the air pocket 14, improving the strength of the welding.

The length L1 in the left-right direction at the bottom end of the packaging bag 1 is preferably 15 to 25 cm, more specifically, any of the values 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, and 25 (unit: cm), and may also be within a range between any two of the values exemplified here, for example, 20 cm. If it is made larger than 25 cm, there is a possibility that it will not fit on the turntable of a microwave oven.

The length L2 of the sloped portion 13a in the left-right direction is preferably 3 to 6 cm, and more specifically, is any of the values 3, 3.5, 4, 4.5, 5, 5.5, and 6 (unit: cm), and may also be within a range between any two of the values exemplified here, for example, 4 cm. If it is made smaller than this, it becomes difficult to completely open the lower end of the central portion in the front-to-rear direction.

The length L3 in the left-right direction of the central portion 13b is preferably 5 to 15 cm, and more specifically, is any one of the values 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 (unit: cm), and may also be within a range between any two of the values exemplified here, for example, 10 cm.

The length L4 in the left-right direction on the inside of the packaging bag 1 is preferably 10 to 23 cm, more specifically, any of the values 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 (unit: cm), or may be within a range between any two of the values exemplified here, for example, 18 cm.

The length W2 from the center line E to the top end of the central portion 13b is preferably 3 to 6 cm, and more specifically, is any of the values 3, 3.5, 4, 4.5, 5, 5.5, and 6 (unit: cm), and may be within a range between any two of the values exemplified here, for example, 4 cm. It is more preferable that the length W2 is the same length as the length L2 of the sloped portion 13a in the left-right direction.

It is desirable that the length H4 from the center line E to the upper end of the fixing part 15, relative to the length H3 from the center line E to the lower end, satisfies H4/H3≧0.2. It is preferable that 0.5≧H4/H3≧0.2, and more specifically, the value of H4/H3 is any of 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, and 0.50, and may also be within a range between any two of the numerical values exemplified here. In this way, by ensuring the length H4 from the center line E to the fixing part 15, it is possible to reliably keep the opening 7 open in the front-to-rear direction.

The angle θ of the sloped portion 13a relative to the upper end of the central portion 13b is preferably between 30 degrees and 60 degrees, more specifically, any of the values of 30, 35, 40, 45, 50, 55, and 60 (unit: degrees), and may be within a range between any two of the numerical values exemplified here, and more preferably 45 degrees. In this way, by making the angle θ of the sloped portion 13a greater than 30 degrees, the width Wn in the front-to-rear direction between the adjacent regions R of the side ends of the packaging bag 1 can be secured, and the self-supporting stability of the packaging bag 1 is improved (see FIG. 6A).

A recessed portion 25 is provided at the lower end of the central portion of the packaging bag 1. In a plan view, the recessed portion is a portion that is recessed upward from a reference line S along the edge portion 17 of the lower end of the side portion of the packaging bag 1.

In this embodiment, the recessed portion 25 is curved so as to connect the inner edges of the side end welds 12 in the left-right direction. That is, the recessed portion 25 is formed so that the vertical length is the longest at the center in the left-right direction, and the vertical length gradually decreases from there toward the left-right ends. The left-right length L of the recessed portion 25 is equal to the left-right length L4 on the inside of the packaging bag 1. However, this is not limited to this form, and it is desirable that the length L is L/L1≧0.5 with respect to the left-right length L1 of the packaging bag 1. It is preferable that 0.9≧L/L1≧0.5, and more specifically, the value of L/L1 is any one of 0.5, 0.6, 0.7, 0.8, and 0.9, and may be within a range between any two of the numerical values exemplified here.

The vertical length H of the recessed portion 25 is preferably H/H1≧0.05, where H1 (see FIG. 2) is the length from the bottom end of the packaging bag to the opening portion. Preferably, 0.2≧L/L1≧0.05. More specifically, the value of H/H1 is 0.05, 0.10, 0.15, or 0.20, or may be within a range between any two of the numerical values exemplified here. More specifically, the length H is preferably 0.5 to 2 cm, or more specifically, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0 (unit: cm), or may be within a range between any two of the numerical values exemplified here, for example, 1.0 cm.

It is preferable that the bottom film 20a has a tensile modulus that decreases with increasing temperature. In this case, when the packaging bag 1 is heated, the film softens and the lower end of the central part of the packaging bag 1 is likely to open in the front-to-rear direction. Here, the tensile modulus of the film constituting the bottom part 2 in the TD direction (corresponding to the front-to-rear direction of the packaging bag 1) at 23.5°C and 100°C are M1 and M2, respectively. The tensile modulus can be determined by conducting a tensile test in accordance with JIS K 7127. The tensile test speed is 50 mm/min, and the dumbbell shape used for the test is No. 5.

M1 is preferably 600 to 1400 MPa, and more preferably 800 to 1200 MPa. Specific examples of M1 include 600, 700, 800, 900, 1000, 1100, 1200, 1300, and 1400 MPa, and may be within a range between any two of the numerical values exemplified here.

M2 is preferably 200 to 600 MPa, and more preferably 300 to 500 MPa. Specifically, M2 may be, for example, 200, 250, 300, 350, 400, 450, 500, 550, or 600 MPa, or may be within a range between any two of the numerical values exemplified here.

The value of M1/M2 is, for example, 1.2 to 4, and preferably 1.5 to 3. Specific examples of this value are 1.2, 1.5, 2, 2.5, 3, 3.5, and 4, and may be within a range between any two of the numerical values exemplified here.

The peripheral wall film 20b may have the same physical properties as the bottom film 20a, or may have different physical properties.

(1-2. Usage of the packaging bag 1)
A usage mode of the packaging bag 1 will be described with reference to Figures 7A and 7B. Figure 7A shows, as a comparative example, a packaging bag P that does not have a recessed portion 25 at the lower end of the center. In Figure 7A, Dp indicates the length in the front-to-rear direction at the center of the opening 7 when the packaging bag P is placed on a placement surface in an opened state.

In contrast, as shown in FIG. 7B, the packaging bag 1 of this embodiment has a recessed portion 25 at the lower end of the central portion, so that when opened, the weight of the contents is applied to the lower end of the central portion with both left and right ends (areas N1 and N2 in FIG. 7B) firmly in contact with the ground, causing the side end welds 12 to tilt inward. This brings the upper ends of the side end welds 12 (areas M1 and M2 in FIG. 7B) closer together, causing the central portion to expand in the front-to-back direction. As a result, the front-to-back length D1 of the central portion of the opening 7 becomes longer than Dp, making the opening larger, improving convenience for users.

<2. Second embodiment>
A second embodiment of the present invention will be described with reference to Fig. 8. This embodiment is similar to the first embodiment, and differs mainly in that the shape of the recessed portion 25 is trapezoidal. The following description will focus on the difference.

In this embodiment, as shown in FIG. 8, the recessed portion 25 is formed in a trapezoidal shape. Even in this case, the same effect as in the above embodiment can be obtained by forming the left-right length L and the up-down length H under the same conditions as in the above embodiment.

3. Other embodiments
Although the embodiments have been described above, the technical ideas of the present disclosure can also be adopted in the following aspects.
The shape of the recessed portion is not limited to that in the above embodiment, and may be other shapes, such as a triangular shape.
The recessed portion 25 may be shaped to follow the lower welded portion 13. In other words, the recessed portion 25 may be formed so that the left and right ends and the center of the recessed portion 25 have the same vertical length.
In the above embodiment, the fixing portion 15 is configured as a semicircular notch R formed in the bottom surface portion 2, but is not limited to this form. For example, the opposing surfaces of the bottom film may be bonded together using an adhesive, or the front surface portion 3 and the rear surface portion 4 may be fixed in the front-rear direction by a fastening means such as a stapler.
In the above embodiment, the bottom portion 2 is made of a film folded into a V shape, but this is not limited to this form and may be made of a film folded into a W shape, for example.
The packaging bag 1 does not need to have a steam release seal portion 11. In that case, for example, the bag can be opened slightly to release steam generated during heating.
The steam release seal portion 11 may be provided in a portion other than the joint portion 10 .
The method for manufacturing the packaging bag 1 is not limited to the method described in the above embodiment.

1: Packaging bag 2: Bottom portion 3: Front portion 3a: Lower front portion 3b: Upper front portion 4: Back portion 5: Cut-out portion 6: Main body portion 7: Opening 10: Joint portion 10a: Overlap portion 11: Steam release seal portion 12: Side end welded portion 13: Lower end welded portion 13a: Sloped portion 13b: Central portion 14: Air pocket 15: Fixed portion 17: Edge portion 20a: Bottom film 20b: Peripheral wall film 21: Peripheral portion 22: Upper end welded portion 24: Opening portion 24a: Tear start portion 24b: Cut line 25: Setback portion

Claims (3)

A self-supporting microwave packaging bag in which a flexible film is formed into a bag shape,
The packaging bag includes a bottom surface portion and a peripheral surface portion provided so as to rise from the bottom surface portion,
The peripheral portion includes a front portion and a rear portion opposed to each other,
the bottom surface portion, the front surface portion, and the rear surface portion are welded together to form the bag shape,
The packaging bag is configured so that a central lower end, which is a lower end of a central portion in a left-right direction of the packaging bag, opens more widely in the front-rear direction than a side lower end, which is a lower end of a side portion in the left-right direction,
The packaging bag has a curved or trapezoidal recessed portion at a lower end of the central portion,
The recessed portion is a portion that is recessed upward from a reference line along the lower end of the side portion in a plan view. The packaging bag according to claim 1 ,
A packaging bag, wherein L/L1≧0.5 is satisfied, where L1 is the left-right length of the packaging bag and L is the left-right length of the recessed portion. The packaging bag according to claim 1 or 2 ,
The peripheral surface portion is provided with an opening portion for opening the packaging bag,
A packaging bag, wherein H/H1 is greater than or equal to 0.05, where H1 is the length from the bottom end of the packaging bag to the opening portion and H is the vertical length of the recessed portion.