JP7539262B2 - Gusset bags and bag-in-box - Google Patents

Description

The present invention relates to a gusset bag and a bag-in-box.

Bag-in-boxes are known in which an inner container made of a soft packaging material is housed inside an outer container such as a cardboard box, and beverages or seasonings are housed in the inner container. When using the bag-in-box, the inner container may be removed from the outer container and held in a gripping state while discharging the contents. For bag-in-boxes intended for such use, the inner container is required to be self-supporting and easy to grip.

As a gusset bag that is self-supporting and easy to grip, a gusset bag with a side gusset and a gripping part at the end of the bag has been proposed. Patent Document 1 discloses a bag-in-box inner bag that has a side gusset and is provided with a handle (grip) that is located at the top when the bag is placed so that the film on the side is the bottom. Patent Document 2 discloses a bag-making container that has a side gusset and is provided with handle parts (grip) at both ends of the bag that sandwich the storage part. In Patent Documents 1 and 2, the gripping part is provided by forming a hole or cut that penetrates the film in the unsealed part surrounded by the sealed part where the overlapping films are joined.

JP 2001-348065 A JP 2016-74463 A

However, bag-in-boxes generally have a large capacity of 5 to 20 liters, and when the inner container made of a soft packaging material is held by the handle and lifted, a large load is applied to the handle. For this reason, the handles provided in Patent Documents 1 and 2 cannot withstand the load when lifted, and there is a risk that the film at the handle will stretch or tear.

The present invention aims to provide a gusset bag whose handle is unlikely to break even when the bag is lifted by grasping the handle, and a bag-in-box equipped with the gusset bag.

The present invention has the following aspects.
[1] A gusset bag having a pair of opposing flat surfaces and a pair of side surfaces that are folded inwardly of the bag, wherein a first end of the pair of side surfaces in the longitudinal direction of a fold line is provided with a handle formed by a linear incision that penetrates from the outer surface of one flat surface to the outer surface of the other flat surface, the incision having a first linear portion extending in a direction intersecting the fold line, a first arc-shaped portion extending continuously from each of both ends of the first linear portion, and a second arc-shaped portion extending further continuously from each of the first arc-shaped portions, wherein each of the first arc-shaped portions extends in an arc from both ends of the first linear portion toward an outer edge of the first end, and each of the second arc-shaped portions extends toward or away from each other, and further wherein a tip side portion of the gusset bag is away from the outer edge of the first end.
[2] The gusset bag described in [1], wherein the first arc-shaped portion and the second arc-shaped portion are both arc-shaped, and the radius of curvature of the second arc-shaped portion is larger than the radius of curvature of the first arc-shaped portion.
[3] A gusset bag according to [1] or [2], wherein a gripping portion seal portion is formed at the first end portion, and the gripping portion formed by the incision is formed within the gripping portion seal portion.
[4] A gusset bag described in any one of [1] to [3], wherein a grip portion is also provided at a second end portion opposite to the first end portion in the longitudinal direction of the fold line of the pair of side portions.
[5] A gusset bag described in any of [1] to [4], having a joint portion at the first end side where the pair of side portions are folded in, where the pair of planar portions are joined directly to each other or partially together with the folded side portions.
[6] A bag-in-box in which any one of the gusset bags [1] to [5] is contained within an outer container.

The present invention provides a gusset bag in which the handle is not easily broken even when the bag is lifted by grasping the handle, and a bag-in-box equipped with the gusset bag.

FIG. 2 is a front view showing a flattened state of the gusset bag of the embodiment. FIG. 2 is a perspective view showing the state in which the gusset bag of FIG. 1 is filled with contents. 2 is an enlarged front view of a grip portion at a first end of the gusset bag of FIG. 1. FIG. 13 is an enlarged front view of a grip portion at a first end of a gusset bag according to another embodiment. FIG. FIG. 2 is an enlarged front view of a grip portion at a first end of a gusseted bag outside the scope of the present invention. 3 is a perspective view showing a state in which the gusset bag of FIG. 2 is gripped with both hands and the contents are discharged. FIG.

The following describes a gusset bag 1 according to one embodiment of the present invention with reference to the drawings. Note that the dimensions of the drawings shown in the following description are merely examples, and the present invention is not necessarily limited to them. Appropriate modifications can be made without departing from the gist of the present invention.

As shown in FIG. 1, the gusset bag 1 is a gusset-shaped bag having a pair of opposing flat surfaces 11, 12 and a pair of side surfaces 21, 22 that are folded inwardly of the bag. The pair of side surfaces 21, 22 are folded in half at fold lines 21a, 22a, respectively, and are disposed between the pair of flat surfaces 11, 12 with the fold lines 21a and 22a butting against each other and facing each other. The gusset bag 1 is also a bag mainly made of a synthetic resin film.

At the first end 2 in the length direction (vertical direction) of the fold lines 21a, 22a of the pair of side portions 21, 22, an upper end seal portion 31 is formed in which the edges of the pair of flat portions 11, 12 and the pair of side portions 21, 22 are joined by heat sealing. At the second end 3 opposite to the first end 2 of the gusset bag 1, a lower end seal portion 32 is formed in which the edges of the pair of flat portions 11, 12 and the pair of side portions 21, 22 are joined by heat sealing. At the left and right side ends 4, 5 of the gusset bag 1, side seal portions 33, 34 are formed in which the edges of the pair of flat portions 11, 12 and the pair of side portions 21, 22 are joined by heat sealing. In this way, the gusset bag 1 is closed all around the periphery by the upper end seal portion 31, the lower end seal portion 32, and the side seal portions 33, 34.

As shown in FIG. 2, the gusset bag 1 of this embodiment expands into a cube or rectangular parallelepiped when filled with contents, and in the bag-in-box, it is an inner container that is shaped like a cube or rectangular parallelepiped and is contained in an outer container with the first end 2 on the upper side and the second end 3 on the lower side. Note that the gusset bag of the present invention is not limited to being contained in an outer container with the first end on the upper side and the second end on the lower side. For example, it may be contained in an outer container with one outer surface of a pair of flat parts facing upward and the first end and second end facing to the side.

Below the upper end seal portion 31 of the gusset bag 1, there is provided an upper storage section seal portion 35 formed by heat sealing, which extends from one side end 4 to the other side end 5. Above the lower end seal portion 32 of the gusset bag 1, there is provided a lower storage section seal portion 36 formed by heat sealing, which extends from one side end 4 to the other side end 5.

In this way, the gusset bag 1 has a contents storage section 6 partitioned by the storage section upper seal section 35 and the storage section lower seal section 36, and contents can be stored in the contents storage section 6. The upper and lower ends of the contents storage section 6 in the gusset bag 1 are closed by the storage section upper seal section 35 and the storage section lower seal section 36. The upper contents unstoring section 41 below the upper end seal section 31 and above the storage section upper seal section 35, and the lower contents unstoring section 42 above the lower end seal section 32 and below the storage section lower seal section 36 are designed not to store contents.

In the gusset bag 1, an upper diagonal seal portion 37a is provided from the intersection of the upper seal portion 35 of the storage section and the fold line 21a of one side surface portion 21 through the contents storage section 6 toward the side seal portion 33 on the side surface portion 21 side. Also, an upper diagonal seal portion 37b is provided from the intersection of the upper seal portion 35 of the storage section and the fold line 22a of the other side surface portion 22 through the contents storage section 6 toward the side seal portion 34 on the side surface portion 22 side. Similarly, lower diagonal seal portions 38a, 38b are provided from the intersection of the lower seal portion 36 of the storage section and the fold lines 21a, 22a of the side surfaces 21, 22 through the contents storage section 6 toward the respective side seal portions 33, 34. The contents are stored in the portion of the contents storage section 6 surrounded by the upper diagonal seal portions 37a, 37b and the lower diagonal seal portions 38a, 38b.

As shown in Figures 1 to 3, a gripping portion 50 is provided below the top end seal portion 31 at the first end 2 of the gusset bag 1 and in the upper content-uncontained portion 41 above the containment portion upper seal portion 35. The gripping portion 50 is formed by a linear cut 51 that penetrates from the outer surface of one flat portion 11 to the outer surface of the other flat portion 12. This allows the first end 2 of the gusset bag 1 to be gripped by inserting a hand into the cut 51 of the gripping portion 50.

The notch 51 that forms the gripping portion 50 has a first linear portion 52, first arc-shaped portions 53, 53 that extend continuously from both ends of the first linear portion 52, and second arc-shaped portions 54, 54 that further extend continuously from each of the first arc-shaped portions 53.

When viewed from the front surface of one of the flat surfaces 11, the first linear portion 52 is linear and extends in a direction (horizontal direction) perpendicular to the length direction of the fold lines 21a, 22a of the pair of side portions 21, 22. That is, the first linear portion 52 extends linearly in a direction intersecting with the fold lines 21a, 22a of the pair of side portions 21, 22. Each of the first arc-shaped portions 53, 53 extends in an arc shape from both ends of the first linear portion 52 toward the outer edge 2a of the first end portion 2. Each of the second arc-shaped portions 54 extends toward the center of the first linear portion 52 so as to approach each other, and furthermore, the portion on the tip 54a side is arc-shaped so as to move away from the outer edge 2a of the first end portion 2. In this way, the second arc-shaped portions 54, 54 are provided at a position that is above the first arc-shaped portions 53, 53 when the gusset bag 1 is lifted.

As described above, the first arc-shaped portion 53 and the second arc-shaped portion 54 in the cut 51 form an arc, and the tip 54a of the second arc-shaped portion 54 extends away from the outer edge 2a of the first end 2 toward the content storage portion 6, so that even if the gripping portion 50 is gripped and the gusset bag 1 is lifted, the film is unlikely to break from the gripping portion 50. Here, the direction in which the gusset bag 1 is lifted is the opposite side of the gripping portion 50 from the content storage portion 6, that is, toward the outer edge 2a of the first end 2, as shown by the arrow in Figure 2.

This effect will be described in more detail below in comparison with the gusseted bag 100 shown in FIG.
The gusset bag 100, like the gusset bag 1, has an upper end seal portion 131 formed by joining the edges of the pair of flat portions 111, 112 and the pair of side portions 121, 122 by heat sealing at a first end portion 102 in the longitudinal direction of the fold lines 121a, 122a of the pair of side portions 121, 122. Below the upper end seal portion 131 at the first end portion 102, a grip portion 150 formed by a cut 151 is provided.

The notch 151 forming the gripping portion 150 has a first linear portion 152, and first arc-shaped portions 153, 153 continuing on both sides of the first linear portion 152, and second arc-shaped portions 154, 154, similar to the gripping portion 50. The notch 151 has the same shape as the gripping portion 50, except that the portion on the tip 154a side of the second arc-shaped portion 154 does not move away from the outer edge 102a of the first end 102 and is linear in the horizontal direction.

In the case of a gusset bag 100 having a gripping portion 150 consisting of a slit 151 of this shape, when the gusset bag 100 is gripped by inserting a hand into the slit 151 and lifted in the same direction as the arrow in Fig. 2, a large load is concentrated on the tip 154a of the second arc-shaped portion 154 on both sides, and the film is likely to stretch or tear starting from the tip 154a of the gripping portion 150, leading to breakage. In contrast, in the case of the gusset bag 1, the tip 54a side of the second arc-shaped portion 54 on both sides of the slit 51 is arc-shaped so that it moves away from the outer edge 2a of the first end 2. Therefore, even when the gripping portion 50 is gripped and the gusset bag 1 is lifted in the direction of the arrow in Fig. 2, the load is unlikely to concentrate on the tip 54a of the second arc-shaped portion 54, and the gripping portion 50 is unlikely to break. That is, the portions of the second arc-shaped portion 54 on both sides of the notch 51 on the side of the tip 54a extend in the direction opposite to the lifting direction, which prevents the film from stretching or tearing starting from the tip 54a of the second arc-shaped portion 54. This prevents the load from concentrating on the tip 54a of the second arc-shaped portion 54, making it difficult for the film to break from the gripping portion 50.

The size of the gripping portion 50 is preferably large enough to accommodate the index finger through little finger of one hand, regardless of the size of the gusset bag 1. Specifically, the horizontal length L (Fig. 3) of the gripping portion 50 is preferably 7 to 11 cm. The vertical height H (Fig. 3) of the gripping portion 50 is preferably 2 to 3 cm.

In the gripping portion 50, it is preferable that the first arc-shaped portion 53 and the second arc-shaped portion 54 are arc-shaped on both sides of the first linear portion 52 of the cut 51, and that the radius of curvature of the second arc-shaped portion 54 located higher in the lifting direction is larger than the radius of curvature of the first arc-shaped portion 53. When the gripping portion 50 is gripped and the gusset bag 1 is lifted in the direction of the arrow in FIG. 2, a larger load tends to be applied to the second arc-shaped portion 54 than to the first arc-shaped portion 53. By making the radius of curvature of the second arc-shaped portion 54 larger than the radius of curvature of the first arc-shaped portion 53, the force applied to the second arc-shaped portion 54 can be dispersed, making it easier to further prevent the film from breaking from the gripping portion 50.

The radius of curvature of the first arcuate portion 53 is preferably 1 to 15 mm, and more preferably 5 to 10 mm.
The radius of curvature of the second arcuate portion 54 is within a range larger than the radius of curvature of the first arcuate portion 53, and is preferably 10 to 29 mm, and more preferably 15 to 25 mm.

The shape of the notch 51 forming the gripping portion 50 is not limited to the embodiment in which the first arc-shaped portion 53 and the second arc-shaped portion 54 are both arc-shaped, and may be, for example, a shape in which the radius of curvature increases continuously from the first linear portion 52 side of the first arc-shaped portion 53 to the tip 54a of the second arc-shaped portion 54.

In the length direction (vertical direction) of the fold lines 21a, 22a of the pair of side portions 21, 22, the distance D (FIG. 3) between the point on the second arc-shaped portion 54 closest to the outer edge 2a of the first end 2 and the tip 54a of the second arc-shaped portion 54 is preferably 2 to 8 mm, more preferably 4 to 6 mm. That is, the distance D is preferably 6.7% to 40% of the vertical height H, more preferably 13% to 30%. If the distance D is equal to or greater than the lower limit of the range, when the gripping portion 50 is gripped and the gusset bag 1 is lifted, the tip 54a of the second arc-shaped portion 54 extends in the opposite direction to the lifting direction, so that the film can be prevented from stretching or tearing starting from the tip 54a of the second arc-shaped portion 54, and the effect of the load being less likely to concentrate on the tip 54a of the second arc-shaped portion 54 is easily achieved, and therefore tearing of the film from the gripping portion is easily suppressed. If the distance D is equal to or less than the upper limit of the range, vertical breakage is more likely to be prevented when the gripping portion 50 is gripped and the gusset bag 1 is lifted.

In the gusset bag 1, a gripping portion seal portion 55 is formed near the portion where the gripping portion 50 is provided below the upper end seal portion 31 at the first end portion 2; in other words, a cut 51 is formed within the gripping portion seal portion 55. In this way, by forming the cut 51 within the gripping portion seal portion 55, breakage when the gripping portion 50 is gripped and the gusset bag 1 is lifted is further suppressed. This is because even if a defect such as a scratch occurs at the end of the cut 51, the gripping portion seal portion 55 makes it difficult for breakage to progress from the defect. In addition, the film around the gripping portion 50 is less likely to come apart, making it easier to grip, and it is possible to suppress the intrusion of foreign matter between the films.

In this example, the gripping portion seal portion 55 is formed in a ring shape along the notch 51, and is connected to the upper end seal portion 31. The notch 51 of the gripping portion 50 is located in the center of the gripping portion seal portion 55 and the upper end seal portion 31 connected thereto. If the gripping portion seal portion 55 and the gripping portion 50 have such a configuration, it is easier to prevent the gripping portion 50 from breaking. This is because even if a defect such as a scratch occurs in the notch 51, the distance from the notch 51 to the portion not containing the contents is the same at any position.
It should be noted that the gripping portion seal portion 55 and the gripping portion 50 are not limited to such an embodiment. For example, the gripping portion seal portion 55 does not have to be annular, and may be formed away from the upper end seal portion 31. In Figures 1 to 3, the upper edge of the upper end seal portion 31 has a recessed shape in two places because the notch 51 is located in the center of the seal portion.

In the gusset bag 1, a gripping portion 60 is also provided at the second end 3 opposite the first end 2 in the longitudinal direction of the fold lines 21a, 22a of the pair of side portions 21, 22. As a result, as shown in FIG. 6, the gusset bag 1 can be gripped on both sides of the contents storage portion 6 with both hands, making it easier to discharge the contents from the spout 7 described below, and since the force applied to each gripping portion 50, 60 can be dispersed and reduced, breakage of the film from each gripping portion 50, 60 can be suppressed.

In this example, the gripping portion 60 provided at the second end 3 is inverted from the gripping portion 50 provided at the first end 2. A gripping portion seal portion 65 is formed at the portion of the second end 3 where the gripping portion 60 is provided above the lower end seal portion 32, and a cut 61 forming the gripping portion 60 is formed in the gripping portion seal portion 65.

The shape of the gripping portion 60 provided at the second end 3 is not limited to that of this embodiment, and may be any shape as long as it allows gripping. For example, the gripping portion 60 may be a U-shaped incision, in addition to the incision 61 having the same shape as the incision 51. The gripping portion 60 may be formed by hollowing out the portions of the pair of flat portions 11, 12 and the pair of side portions 21, 22 where the gripping portion 60 is to be provided, into a predetermined shape such as a substantially rectangular shape. It is preferable that the incision 61 has the same shape as the incision 51, since the same blade as that used to form the incision 51 can be used during manufacturing.

As shown in FIG. 1, in the gusset bag 1, a joint 81 is provided at the position of the upper seal portion 35 of the storage section on the first end 2 side where the side portion 21 is folded, where the pair of flat portions 11, 12 are directly joined together or partially joined together with the folded side portion 21. For example, the joint 81 can be formed by providing a hole at the position where the joint 81 is to be provided in the side portion 21 and directly joining the pair of flat portions 11, 12 together at the hole by heat sealing. In addition, a film having heat sealability may be used for the outermost layer of the side portion 21, or a heat seal coating may be applied, and the outer surfaces of the side portion 21 may be partially joined together by heat sealing to form the joint 81 where the flat portions 11, 12 are joined together with the side portion 21. The joint 81 may be formed by partially joining the outer surfaces of the side portion 21 together using an adhesive. In addition, the joint 81 may be formed by partially joining the outer surfaces of the side portion 21 together by means other than external heating, such as ultrasonic sealing or high frequency sealing.

Similarly, in the gusset bag 1, a joint 82 is provided at the position of the upper seal portion 35 of the storage section on the first end 2 side where the side portion 22 is folded in, where a pair of planar portions 11, 12 are joined together directly or partially together with the folded side portion 22.
When providing such a joint on the first end side, it is sufficient that at least one joint is provided in each folded portion of the side surface, and there are no particular limitations on the number or shape.

By providing the joints 81, 82, the gusset bag 1 can be lifted in the direction of the arrow in FIG. 2 by inserting a hand or a machine hand into the content storage section 6 side of the joints 81, 82 at the portion where the pair of side sections 21, 22 are folded. This makes it possible to fill the contents in a state where the gusset bag 1 is lifted using the joints 81, 82, for example, by a machine. In addition, by providing the joints 81, 82, the force applied to the gripping section 50 can be further dispersed when the gripping section 50 is gripped to lift the gusset bag 1 in the direction of the arrow in FIG. 2, so that bag breakage from the gripping section 50 can be further suppressed.

In this example, similarly, at the position of the storage section lower seal portion 36 on the second end 3 side where the side portions 21, 22 are folded, joint portions 83, 84 are provided where the pair of flat portions 11, 12 are joined directly to each other or partially to the folded side portions 21, 22. This provides the same effect on the second end 3 side of the gusset bag 1.
The gusset bag of the present invention may have no joints on the first end side and the second end side.

The size of the gusset bag 1 is not particularly limited and can be set appropriately, but it is preferable that the size corresponds to the weight that can be held in one or both hands when filled with the contents.
For example, the size of the gusset bag 1 in a flattened state can be 420 mm to 670 mm in length in the vertical direction, 180 to 350 mm in width, and 350 mm to 600 mm in length between the upper seal part 35 of the storage section and the lower seal part 36 of the storage section, and is preferably 500 mm to 600 mm in length, 180 to 300 mm in width, and 350 mm to 500 mm in length between the upper seal part 35 of the storage section and the lower seal part 36 of the storage section. The most suitable size of the gusset bag 1 is 570 mm in length, 250 mm in width, and 460 mm in length between the upper seal part 35 of the storage section and the lower seal part 36 of the storage section, with a capacity of about 10 liters of contents.

The gusset bag 1 of the present embodiment can be a double bag consisting of an outer bag and an inner bag mainly made of a synthetic resin film. That is, each of the pair of flat portions 11, 12 and the pair of side portions 21, 22 constituting the gusset bag 1 can be made of two films, an outer bag film forming the outer bag and an inner bag film forming the inner bag. When the gusset bag of the present invention is used as an inner container of a bag-in-box, such a double bag is preferable. This makes it easier to prevent pinholes from opening in the gusset bag due to friction or impact with the outer container of the bag-in-box or the flow of the contents, causing the contents to leak out.
The gusset bag of the present invention is not limited to a double bag, and may be, for example, a single-ply bag in which a pair of flat surfaces and a pair of side surfaces are each made of a single film, or a triple or more-ply bag in which a pair of flat surfaces and a pair of side surfaces are each made of three or more films.

When the gusset bag 1 is a double bag consisting of an outer bag and an inner bag, the outer bag film is not particularly limited, and examples thereof include a laminate of an outer layer film having heat resistance and impact resistance and an inner layer film having sealing properties.
The outer layer film is not particularly limited, and examples thereof include a biaxially oriented polyamide film, a biaxially oriented polyethylene terephthalate film, etc. In addition, for the purpose of suppressing the penetration of oxygen or moisture from the outside, a vapor deposition film of a metal oxide or metal may be provided on the exterior film.

The inner layer film is not particularly limited, and examples thereof include unstretched films of polyolefins such as polyethylene (low density polyethylene, linear low density polyethylene, high density polyethylene, etc.) and polypropylene, or films obtained by extruding these resins in a layer on the outer layer film.
The laminate of the outer layer film and the inner layer film can be produced by a known method such as a dry lamination method or an extrusion lamination method.

The inner bag film in the gusset bag 1 can be, for example, the unstretched film exemplified as the inner layer film of the outer bag film. The inner layer film of the outer bag film and the inner bag film are preferably made of the same type of resin, as this provides excellent sealing properties.

A stopper 7 is attached to the flat surface 11 of the content storage section 6 of the gusset bag 1, which is located at the top when the bag expands to store the contents. The stopper 7 is for filling or discharging the contents of the content storage section 6. The stopper 7 is made up of a tube section 71 and a flange section 72.

The tubular portion 71 is cylindrical and has a threaded portion on its outer circumferential surface so that it can be sealed by fitting a cap (not shown) having a threaded portion on its inner circumferential surface. The flange portion 72 extends horizontally in an annular shape from the lower end of the tubular portion 71. The surface of the flange portion 72 facing the tubular portion 71 is joined to the inner surface of one of the flat portions 11 of the gusset bag 1. Therefore, it is preferable that at least the joining surface of the flange portion 72 with the inner surface of the flat portion 11 is formed of a synthetic resin or the like that can be heat-sealed to the inner bag film that forms the inner surface of the flat portion 11 of the gusset bag 1.

In this embodiment, an opening is provided in one of the flat portions 11, and the tubular portion 71 of the spout 7 protrudes from the inside of the gusset bag 1 to the outside through the opening in one of the flat portions 11. The surface of the flange portion 72 of the spout 7 facing the tubular portion 71 is joined by heat fusion to the inner surface of the flat portion 11 of the gusset bag 1. Note that the manner in which the spout 7 is attached is not limited to this manner.

A method of using the gusset bag 1 of this embodiment will be described below.
In the gusset bag 1, the contents, which are mainly liquid, are filled into the contents storage section 6 through the spout 7. When the contents are stored, the contents storage section 6 expands into a substantially cubic or rectangular parallelepiped shape as shown in Fig. 2. When the contents are filled and placed, the lower unstored portion 42 is sandwiched between the contents storage section 6 and the placement surface, and the upper unstored portion 41 is in a shape that protrudes upward or is in a shape that falls along the contents storage section 6. For example, the gusset bag 1 containing the contents is stored in the outer container of a bag-in-box with the first end 2 on the upper side and the second end 3 on the lower side.

The gusset bag 1 can be lifted by inserting a hand into the notch 51 of the gripping portion 50 provided at the first end 2 and gripping it, so that the contents of the content storage portion 6 can be easily discharged. In addition, since the shape of the notch 51 of the gripping portion 50 is the specific shape as described above, when the gusset bag 1 is lifted in the direction of the arrow in FIG. 2, the load is distributed and is not likely to be applied locally to a specific part of the gripping portion 50, so that breakage of the film from the gripping portion 50 is suppressed. In addition, by holding the gripping portion 50 with one hand to lift the gusset bag 1, and then holding the gripping portion 60 provided at the second end 3 with the other hand to tilt the gusset bag 1, it becomes even easier to discharge the contents of the content storage portion 6, the load is further distributed, and breakage of the film from the gripping portions 50, 60 is further suppressed.

As described above, the gusset bag of the present invention prevents the film from breaking at the gripping portion even when the gripping portion at the first end is gripped and the gusset bag is lifted. Furthermore, by providing a gripping portion at the second end as well, the contents can be easily removed by gripping the gusset bag with both hands, and further prevents the film from breaking at the gripping portion.

The gusset bag of the present invention can be suitably used as an inner container for a bag-in-box. However, the use of the gusset bag of the present invention is not limited to an inner container for a bag-in-box.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and their modifications.
For example, as shown in Fig. 4, gripping portion 50A may be provided at first end 2 instead of gripping portion 50. Grip portion 50A has the same configuration as gripping portion 50, except that second arc-shaped portions 54, 54 in cuts 51A extend in an arc away from each other and portions on the tip ends 54a, 54a side are away from outer edge 2a of first end 2. When gripping portion 50A of this configuration is provided, breakage of the film from gripping portion 50A can be similarly suppressed when gripping portion 50A is gripped to lift up the gusset bag.

The gusset bag of the present invention may not have a gripping portion at the second end, and may not have an upper uncontained portion or a lower uncontained portion. In the above embodiment, the upper end seal portion and the upper part of the container are described as separate seal portions, but they may be one seal portion including the upper end seal portion and the upper part of the container. Similarly, in the above embodiment, the lower end seal portion and the lower part of the container are described as separate seal portions, but they may be one seal portion including the lower end seal portion and the lower part of the container. In addition, in the above embodiment, the outer edges of the first end and the second end are cut along the upper and lower edges of the upper end seal portion and the lower end seal portion, respectively, but this is not limited to this, and for example, the outer sides of each seal portion may be cut in a straight line. In addition, in FIG. 1, the upper part of the container and the lower part of the container are wider at the joint 81, but this is not limited to this shape, and they may be strip-shaped seal portions of the same width over the entire length.
In the case where the joint is formed by providing a hole in the side surface, it is preferable that the upper seal portion of the storage section and the lower seal portion of the storage section are shaped to cover the entire joint. In addition, addition, omission, substitution, and other modifications of the configuration are possible within the scope of the spirit of the present invention.

In this specification, words indicating directions such as "upper, lower, left, right, vertical, horizontal, outer and inner" are used to describe these directions in the context of the present invention. Therefore, these words used to describe the specification of the present invention should be interpreted relatively in the context of the present invention.

1...gusset bag, 2...first end, 3...second end, 4, 5...side end, 6...content storage section, 7...mouthpiece, 11, 12...flat section, 21, 22...side section, 21a, 22a...fold line, 31...upper end seal section, 32...lower end seal section, 33, 34...side seal section, 35...storage section upper seal section, 36...storage section lower seal section, 37a, 37b...upper diagonal seal section 38a, 38b...lower diagonal seal portion, 41...upper portion not containing contents, 42...lower portion not containing contents, 50, 50A...gripping portion, 51, 51A...notch, 52...first linear portion, 53...first arc-shaped portion, 54...second arc-shaped portion, 54a...tip, 55...gripping portion seal portion, 60...gripping portion, 61...notch, 65...gripping portion seal portion, 81-84...joint portion.

Claims (5)

A gusset bag having a pair of opposing flat surfaces and a pair of side surfaces that are folded inwardly of the bag,
A gripping portion formed by a linear cut penetrating from the outer surface of one planar portion to the outer surface of the other planar portion is provided at a first end of the fold line of the pair of side surface portions in the longitudinal direction,
The cut includes a first linear portion extending in a direction intersecting the fold line and intersecting the fold line, a first arc- shaped portion extending continuously from both ends of the first linear portion, and a second arc-shaped portion further extending continuously from each of the first arc-shaped portions,
Each of the first arcuate portions extends in an arc shape from both ends of the first linear portion toward an outer edge of the first end portion,
Each of the second arcuate portions extends toward or away from each other and has a distal portion that is away from an outer edge of the first end portion,
The first end portion includes an upper end seal portion formed by heat sealing the end edges of the pair of flat portions and the pair of side portions, and a grip portion seal portion formed near the grip portion formed by the cut,
the grip portion formed by the incision is within the grip portion seal portion,
The gripping portion seal portion is formed in an annular shape along the cut and is connected to the upper end seal portion,
A gusset bag, wherein the notch of the gripping portion is located at a center portion of the gripping portion seal portion and the upper end seal portion connected thereto. The gusset bag according to claim 1, wherein the first arc-shaped portion and the second arc-shaped portion are both arc-shaped, and the radius of curvature of the second arc-shaped portion is greater than the radius of curvature of the first arc-shaped portion. The gusset bag according to claim 1 or 2, wherein a gripping portion is also provided at a second end portion opposite to the first end portion in the length direction of the fold lines of the pair of side portions. The gusset bag according to any one of claims 1 to 3, wherein the pair of flat surfaces are joined directly to each other or partially to the folded side surfaces at the first end side of the folded portion. A bag-in-box in which the gusset bag according to any one of claims 1 to 4 is housed in an outer container.

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