Zippered gusset bag and zippered gusset bag packaging

Abstract

To provide a gazette bag body with a zipper capable of securing a sufficiently large opening even with a lateral surface connection part provided and capable of reducing a gap and sealing to the opening to such a degree that can be used without problems practically, and the gazette bag package with the zipper.SOLUTION: A gazette bag body with a zipper comprises a gazette bag body having: a pair of flat surfaces including a front surface and a back surface; a pair of lateral surfaces with a lateral gazette including foldings in a gazette shape and forming a cylindrical part connecting the front surface and the back surface and having a rectangular cross section with the pair of flat surfaces; a lateral surface connection part connecting a first region of a front surface side and a second region of a back surface side of the pair of lateral surfaces and projecting outward along a vertical direction at the center of the lateral surface; and an opening which opens one end side of the cylindrical part. The gazette bag body with a zipper also comprises a linear zipper 12 formed at the opening and having engaging projections, and the zipper 12 comprises a plurality of slits 12C arranged at an interval in a direction crossing with a longitudinal direction where engaging projections 122, 126 extend.SELECTED DRAWING: Figure 9

Description

Technical Field

[0006] , ,

[0001] The present invention relates to a gusseted bag body with a chuck and a gusseted bag package with a chuck.

Background Art

[0002] As is well known, in order to increase the internal volume of a packaging bag, a gusseted bag having gusseted side portions connecting a front portion and a rear portion that constitute a pair of flat portions is known. Such a gusseted bag has the advantage that the opening can be widened by expanding the side portions. In addition, among gusseted bags, those provided with a chuck portion in the vicinity of the opening portion so that the opening portion can be opened and closed are widely used.

[0003] For example, when providing a chuck portion in a gusseted bag having gusseted side portions, there is a case where the side portions are provided from the bottom of the bag body to the lower part of the chuck portion, and a chuck portion having a male type and a female type is arranged on each of the pair of flat portions in the same manner as a bag without side portions (see, for example, Patent Document 1).

[0004] In addition, when providing a chuck portion in a gusseted bag having gusseted side portions, the side portions are formed over the entire vertical length from the bottom of the bag body to the opening portion, the side portions are brought closer to one of the flat portions (for example, the rear portion), and one of the chuck portions having a male type and a female type is arranged over the entire width direction of the flat portion of the pair of flat portions where the side portions are not brought closer (for example, the front portion), and the other is arranged on the flat portion where the side portions are brought closer (for example, the rear portion) (see, for example, Patent Document 2). [[ID=​​​​​​​For example, the zippered gusset bag described in Patent Document 3 has a zipper section with male and female parts that can be fitted together on opposing surfaces when the side sections are folded, allowing the zipper section to be fitted while the side sections are folded. Since a male and female zipper section is arranged on each of the pair of planes, the side sections have a male zipper section on one side and a female zipper section on the other, with the V-shaped fold line of the gusset as the boundary, which is thought to involve a complicated manufacturing process.

[0007] Furthermore, a gusseted bag with a fitting device has been proposed in which a band-shaped fitting device having two or more anchor-shaped projections that can be fitted together is provided along the entire circumference of the inner surface of a gusseted bag body formed by a pair of flat sections and a pair of side sections, and the opening can be closed (see, for example, Patent Document 4). In the gusseted bag with a fitting device disclosed in Patent Document 4, a first notch is provided in the fitting section provided on the side section, corresponding to each fold line of the side section, and a second notch is provided in the fitting section provided on the flat section, corresponding to the first notch when the opening is closed, so that it can be folded with the notch as a base point, the fitting section can be brought closer to each other while maintaining its linearity without curving, and the opening can be stably sealed so that it can be opened. In the fitting section described in Patent Document 4, there are a total of six notches, one notch per bag body. In manufacturing this bag, it was difficult to position a single notch in the corresponding location on the bag.

[0008] On the other hand, some gusseted bags have side joints at the V-shaped tops of the gusseted side sections on both sides. This type of gusseted bag is advantageous because it can be manufactured from a single rectangular film, even if it has side sections and a bottom section (see, for example, Patent Document 5). [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2004-010055 [Patent Document 2] Japanese Patent Application Publication No. 8-282689 [Patent Document 3] Japanese Patent Publication No. 2011-006103 [Patent Document 4] Japanese Patent Publication No. 2012-051614 [Patent Document 5] Japanese Patent Publication No. 2020-055585 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] However, while Patent Document 5 mentions the provision of a zipper in a gusseted bag, it does not disclose the specific configuration of the zipper. Therefore, there has been a demand for a new technology to provide a gusseted bag with a zipper, formed from a single rectangular film and having side seams.

[0011] The present invention has been made in consideration of these circumstances, and aims to provide a zippered gusset bag and a zippered gusset bag packaging that, even though they are formed from a single rectangular film and have side joints, can secure a sufficiently large opening, and when the opening is closed, can be sealed by reducing the gap to a level that does not pose a practical problem. [Means for solving the problem]

[0012] According to embodiment 1 of the present invention, Formed from a single rectangular film A gusseted bag with a zipper, comprising a pair of flat sections consisting of a front section and a rear section, and side gussets consisting of gusset-shaped folds, connecting the front section and the rear section and forming a cylindrical section with a rectangular cross-section together with the pair of flat sections. , consisting of a left side section and a right side section A gusset bag having a pair of side sections, a side joint section formed in the center of the side section, projecting outward along the vertical direction, joining a first region on the front side and a second region on the rear side of the pair of side sections, and an opening that opens one end of the cylindrical section, and an engaging projection formed in the opening A pair of identical shapes A chucked gusset bag body comprising a linear chuck portion, wherein the chuck portion has The chuck portions are interlocked with each other and are interlocked with the same chuck portions, and the engaging projection is crushed and melted together with the side joint at a position sandwiched between the side joints, one chuck portion extends from one side joint through the front side region of the left side, the front and the front side regions of the right side, to the other side joint, and is arranged around half of the inner circumferential surface on the front side of the cylindrical portion, the other chuck portion extends from one side joint through the rear side region of the left side, the rear and the rear side regions of the right side, to the other side joint, and is arranged around half of the inner circumferential surface on the rear side of the cylindrical portion, and the chuck portion is, a plurality of cut portions arranged at intervals in a direction intersecting the longitudinal direction in which the engaging protrusion extends. A constant length along the entire length of the chuck portion It is possible to bend it so that any of the multiple notches acts as a pivot point, with the engaging projection being folded back 180° outward or inward. A chucked gusset bag body is provided.

[0013] According to aspect 2 of the present invention, in the chucked gusset bag body of aspect 1, the cut portions are formed at intervals of 1 mm or more and 3 mm or less.

[0014] According to aspect 3 of the present invention, in the chucked gusset bag body of aspect 1 or aspect 2, at the four corners of the cylindrical portion connecting the pair of flat portions and the pair of side portions, there are four-corner joints below the chuck portion along the vertical direction.

[0015] According to aspect 4 of the present invention, in the chucked gusset bag body according to any one of aspects 1 to 3, the other end of the cylindrical portion has a bottom portion.

[0016] According to aspect 5 of the present invention, a chucked gusset bag package containing contents is provided in the chucked gusset bag body according to any one of aspects 1 to 4.

Advantages of the Invention

[0017] According to the chucked gusset bag body and the chucked gusset bag package according to the present invention, even if a side joint portion is provided, a sufficiently large opening can be secured, and when the opening is closed, the gap can be reduced to a practically non-problematic level and sealed.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view for explaining a schematic configuration of a chucked gusset bag body according to an embodiment. [Figure 2]It is a conceptual diagram for explaining a schematic configuration in a state where the contents are stored in a gusseted bag with a chuck according to an embodiment, the side gussets are protruded outward from the gusseted bag, and the opening is closed. (A) shows a front view, and (B) shows a perspective view. [Figure 3] It is a conceptual diagram for explaining a schematic configuration in a state where the contents are stored in a gusseted bag with a chuck according to an embodiment, the side gussets are protruded inward from the gusseted bag, and the opening is closed. (A) shows a front view, and (B) shows a perspective view. [Figure 4] It is a conceptual diagram for explaining a schematic configuration of a gusseted bag with a chuck according to an embodiment. (A) shows a cross-sectional view taken along the arrow IVA-IVA in FIG. 1, and (B) shows a bottom view. [Figure 5] It is a cross-sectional view taken along the arrow V-V in FIG. 1 for explaining a schematic configuration of a gusseted bag with a chuck according to an embodiment. [Figure 6] It is a partial perspective view showing the inside of a gusseted bag with a chuck according to an embodiment. [Figure 7] It is a front view of a gusseted bag with a chuck according to an embodiment, in which the side gussets are folded inward. [Figure 8] It is a cross-sectional conceptual diagram of a linearly extending chuck portion according to an embodiment. (A) shows a non-engaged state, and (B) shows an engaged state. [Figure 9] (A) is a perspective view for explaining a schematic configuration of a chuck portion of a gusseted bag with a chuck according to an embodiment, and (B) is a perspective view showing a schematic configuration of another chuck portion. [Figure 10] (A) is a conceptual diagram partially showing the chuck portion in a state where the opening of a gusseted bag with a chuck according to an embodiment is closed, and (B) is a conceptual diagram for explaining a configuration according to a comparative example in which chucks are provided around the entire circumference of the side of the gusseted bag. [Figure 11] It is a front view for explaining a schematic configuration of a flat bag in a flat bag forming process according to a manufacturing method of an embodiment. [Figure 12] It is a perspective view for explaining a schematic configuration of a gusseted bag with a chuck without four-corner joints. [Modes for carrying out the invention]

[0019] An embodiment of the present invention will be described below with reference to Figures 1 to 12. As shown in Figure 1, the gusseted bag body 10 with a zipper in this embodiment comprises a gusseted bag body 11 and a zipper portion 12.

[0020] The gusseted bag 11 is formed into a bag shape by folding a single rectangular film. The film is, for example, a laminate consisting of at least a base layer and a heat-sealable layer. The base layer forms the outermost layer of the laminate, and the heat-sealable layer forms the innermost layer. The base layer is made of a biaxially oriented or uniaxially oriented film such as polyethylene terephthalate, polypropylene, or polyamide, which has excellent printability and strength, and may be made of a single layer or multiple layers using these materials. It may also be made of paper or nonwoven fabric. The heat-sealable layer is made of an unstretched film or layered resin of polyethylene-based resins such as polypropylene resin, low-density polyethylene, or linear low-density polyethylene. Furthermore, to provide gas barrier functionality that blocks oxygen and water vapor, one or more layers of a film, or a vapor-deposited film or metal foil, which has metals such as aluminum, aluminum oxide, or silicon oxide deposited on it, may be used as a functional layer between the substrate layer and the heat-sealed layer. These layers are bonded together by known methods such as dry lamination or extrusion lamination to form a laminate. Furthermore, the film is not limited to a laminated structure, but may also be a single-layer film.

[0021] The gusseted bag body 11 of this embodiment includes a pair of flat sections 2 consisting of a front section 3 and a rear section 4, a pair of side sections 5 having a side gusset 51 made of a gusset-like fold, connecting the front section 3 and the rear section 4 and forming a cylindrical section 8 with the pair of flat sections 2 having a rectangular cross-section, a side joint section 52 formed in the center of the side section 5, projecting outward along the vertical direction, and an opening 9 that opens one end of the cylindrical section 8. The gusseted bag body 11 of this embodiment further includes a bottom section 1 at the other end of the cylindrical section 8 and four corner joint sections 14 at the four corners of the rectangular cylindrical section 8. In addition, the gusseted bag body 11 of this embodiment has a fold section 24 connecting the bottom section 1 and the side section 5 on the inside of the side section 5. As will be described in more detail later, the chuck portion 12 is linear and is formed along the inner circumferential surface of the opening 9. Also, as shown in Figure 7, the four corner joint portions 14 are formed below the lower end 12T of the chuck portion 12.

[0022] A zippered gusseted bag 10, which has a zipper section 12 on a gusseted bag body 11, can be closed after the contents are placed inside by either having the side gussets 51 protrude outward from the gusseted bag body 11 to close the opening 9, as shown in Figures 2(A) and (B), or by having the side gussets 51 protrude inward from the gusseted bag body 11 and bent to close the opening 9, as shown in Figures 3(A) and (B).

[0023] As shown in Figures 1 and 4(A), the bottom portion 1 is provided at the other end of the cylindrical portion 8 and has a pair of long sides 1A which are the first pair of opposite sides, and a pair of short sides 1B which are the second pair of opposite sides, and is formed in a substantially rectangular shape when viewed from above. The pair of long sides 1A of the bottom portion 1 are connected to the front portion 3 and the rear portion 4 of the pair of flat portions 2, respectively. Each of the two short sides 1B of the bottom portion 1 is connected to a folding portion 24, which will be described later, and these folding portions 24 are connected to a pair of side portions 5, consisting of a right side portion 6 and a left side portion 7.

[0024] Furthermore, as shown in Figures 4 and 7, the bottom portion 1 has a gusset-like fold, i.e., a bottom gusset 21. The bottom gusset 21 is folded so as to be convex inward when the gusset bag body 11 is folded. The bottom gusset 21 has a valley fold portion 25 which is folded so as to be convex inward, and a mountain fold portion 26 which is folded so as to be convex outward. The valley fold portion 25 is formed in the middle of the front portion 3 and the rear portion 4, having a straight portion 25a that is parallel to the front portion 3 and the rear portion 4 and ends inward from the periphery of the bottom portion 1, and V-shaped portions 25b that extend from both ends 25c of the straight portion 25a toward the corresponding corners of the bottom portion 1. The mountain fold portion 26 extends almost perpendicularly from both ends 25c of the straight portion 25a in the valley fold portion 25 toward the short side 1B of the bottom portion 1. The bottom gusset 21 is folded so that it protrudes inward, causing the bottom portion 1 to be folded so that the front portion 3 and the rear portion 4 are close to each other. Thus, the gusseted bag 11 of this embodiment is configured to be easily self-supporting by having a bottom surface 1 at the other end of the cylindrical portion 8. Furthermore, since the gusseted bag 11 of this embodiment has a bottom gusset 21 formed on the bottom surface 1, the internal volume can be increased and the self-supporting ability can be improved.

[0025] The pair of flat sections 2 (hereinafter sometimes simply referred to as flat section 2) consist of a front section 3 and a rear section 4, as shown in Figures 1 and 4. Furthermore, the front portion 3 and the rear portion 4 are formed in a long rectangular shape when viewed from the front, and each rises upward from a pair of long sides 1A of the bottom portion 1 via a bottom joint portion 22, which will be described later, and faces each other across the bottom portion 1.

[0026] As shown in Figures 1 and 4, the pair of side sections 5 (hereinafter sometimes simply referred to as side section 5) comprises a right side section 6 and a left side section 7, and has a gusset-like fold, i.e., a side gusset 51, which is folded so as to be convex inward of the gusset bag body 11. Furthermore, the right side portion 6 and the left side portion 7 are formed in a long, rectangular shape when viewed from the side. The pair of side sections 5 connect the front section 3 and the rear section 4 to form a rectangular cross-section cylindrical section 8 that creates an internal storage space consisting of a rectangular parallelepiped with the shape of the bottom section 1.

[0027] As shown in Figures 1, 4, and 6, the side joint portion 52 is formed in the center of the width direction of the side portion by joining the front portion side region 53 located on the front portion 3 side of the right side portion 6 and the left side portion 7, and the rear portion side region 54 located on the rear portion 4 side, and is formed to protrude outward along the vertical direction from the center of the side portion 5. The front side region 53 and the rear side region 54 are connected via the side joint portion 52. The side joint 52 is formed by overlapping and welding together a film connected from the front side region 53 and a film connected from the rear side region 54 in the thickness direction.

[0028] As shown in Figure 6, isosceles triangular folded portions 24 are formed on the inner surface of each side portion 5. Figure 6 shows only the right side portion 6. Furthermore, the folded portion 24 is formed in the shape of a right-angled isosceles triangle, with the shorter side 1B of the bottom portion 1 being the hypotenuse 24L, as viewed from inside the zippered gusset bag 10.

[0029] As shown in Figure 5, the side portion 5 and the folded portion 24 on the back of the zippered gusset bag 10 are formed by overlapping three layers of film in the thickness direction. The overlapping of three layers of film at the folded portion 24 improves the self-supporting ability of the zippered gusset bag 10. The two outermost of the three films are joined together by inclined joints 55 (see Figure 6) formed on the side portion 5. In other words, the inclined joints 55 are formed along the two equal sides 24M of the isosceles triangle that constitutes the folded portion 24, thereby joining the folded portion 24 and the side portion 5.

[0030] The bottom-side end 24a, where the upper outer edge of the inclined joint 55, which is formed with a certain width, intersects with the bottom joint 22, serves as the base point for the four sides of the bottom portion 1 of the gusseted bag 11.

[0031] As a result, the gap between the equal-length 24M of the folded portion 24 and the side portion 5 is closed, preventing contents from entering the gap between the folded portion 24 and the side portion 5 when the contents are filled into the zippered gusset bag 10.

[0032] The four corner joints 14 connect the two sides in the width direction of the pair of flat sections 2 and the two sides in the width direction of the pair of side sections at the four corners of the rectangular cylindrical section 8 of the gusset bag body 11. The four corner joints 14 are located below the zipper section 12 formed in the opening 9. In the parts where the four corner joints 14 are formed in the vertical direction of the four corners of the rectangular cylindrical section 8, the right side section 6 and the left side section 7 are connected to the front section 3 and the rear section 4, respectively, along the vertical direction via the four corner joints 14.

[0033] As shown in Figures 1 to 3, 6, and 7, the four corner joints 14 are formed in an area below the lower end 12T of the chuck portion 12 (towards the bottom surface 1). As a result, the chuck portion 12 is positioned without being sandwiched between the four corner joint portions 14.

[0034] In the vertical direction of the gusseted bag body 11, in the parts of the rectangular cylindrical portion 8 where the corner joints 14 are not formed, the right side portion 6 and the left side portion 7 are connected to the front portion 3 and the rear portion 4, respectively, along the vertical direction via boundary lines 10L. The boundary lines 10L are the outer edges of the corner joints 14 and their extensions.

[0035] In this embodiment, the zippered gusset bag 10 has four corner joints 14 formed at the four corners of the gusset bag 11, and together with the side joints 52, it has six joints that extend in the vertical direction. Therefore, the zippered gusset bag 10 of this embodiment has a structure that makes it easy to stand on its own, and the folding positions of the four corners are clearly defined by the four corner joints 14, making it easy to fold and giving it excellent shape retention, resulting in a superior appearance. In addition, the position for fitting the zipper is determined and not ambiguous, so fitting the zipper is easy despite the large opening 9. Furthermore, since the four corner joints 14 are formed below the zipper 12, the zipper 12 is not pinched by the four corner joints 14, so a sufficiently large opening 9 can be secured when the zipper 12 is opened.

[0036] In this embodiment, the gusseted bag packaging 100, in which contents are contained in the gusseted bag body 11 with a zipper, is preferably configured such that the dimension L1 from the lower end 12T of the zipper portion 12 to the upper end 14T of the corner joint portion 14 is approximately equal to the dimension L0 from both ends in the width direction of the side portion 5 to the gusseted fold line of the side portion 5. As a result, as shown in Figure 2, when the side gusset 51 protrudes outward from the gusseted bag body 11 to close the opening 9, the gusseted bag body 11 with a zipper is formed in a substantially rectangular parallelepiped shape with the same shape as the bottom portion 1 from the lower end up to the height where the corner joint portion 14 is formed, and above the corner joint portion 14, an inclined portion is formed that slopes at approximately 45° from the upper end 14T of the corner joint portion 14 toward the intersection of the lower end 12T of the zipper portion 12 and the gusseted fold line of the side portion, which provides an aesthetic effect. However, although dimensions L1 and L0 are approximately equal, it is preferable to make L1 slightly longer, about 1 to 1.5 times longer than L0, taking into consideration dimensional accuracy during bag manufacturing. Furthermore, as shown in Figures 2(A) and (B), when the side gusset 51 is made to protrude outward from the gusset bag body 11 to close the opening 9, the opening 9 is not obstructed by the four corner joints 14, and the front side region 53 of the right side, the front side region 53 of the left side, and the rear side region 54 of the right side, the rear side 4, and the rear side region 54 of the left side extend in a straight line, allowing the two opposing zipper portions 12 to also extend in a straight line, so that the zipper portions 12 can be easily fitted and the opening 9 can be closed. The configuration of the zipper portion 12 will be described later.

[0037] Furthermore, as shown in Figures 3(A) and (B), even when the side gusset 51 is made to protrude inward from the gusset bag body 11 and the gusset is folded to close the opening 9, the dimension L1 from the lower end 12T of the zipper portion 12 to the upper end 14T of the corner joint portion 14 is set to be approximately equal to the dimension L0 from both ends in the width direction of the side portion 5 to the gusset-shaped fold line of the side portion 5. As a result, from the lower end up to the height where the corner joint portion 14 is formed, it is formed into a roughly rectangular parallelepiped with the same shape as the bottom portion 1. Above the corner joint portion 14, the upper end 14T of the corner joint portion 14 serves as the starting point, and an inclined portion is formed that slopes at approximately 45° from the upper end 14T toward the intersection of the lower end 12T of the zipper portion 12 and the gusset-shaped fold line of the side portion, which provides an aesthetic effect. However, although dimensions L1 and L0 are approximately equal, it is preferable to make L1 slightly longer, about 1 to 1.5 times longer than L0, taking into consideration dimensional accuracy during bag manufacturing.

[0038] Furthermore, it is desirable that the shape of the upper end portion 14T of the four corner joint portion 14 be either an arc shape or an inclined shape that slopes in either the width direction. This prevents the film from tearing from the boundary line near the upper end portion 14T of the four corner joint portion 14.

[0039] Furthermore, it is preferable that the four corner joints 14 are formed in a position that does not overlap with the inclined joints 55. Specifically, it is preferable that they are formed above the inclined joints 55 to the extent that they do not come into contact with the inclined joints 55. As a result, the base portion 1 can expand in a rectangular shape without being hindered by the corner joints 14.

[0040] Furthermore, as shown in Figures 1 to 3, the gusseted bag body 11 has bottom joint portions 22 that extend on the same plane as the front portion 3, rear portion 4, right side portion 6, and left side portion 7, on the lower outer sides of the four sides of the bottom portion 1.

[0041] The bottom joint portion 22 is formed at the lower end of the gusseted bag body 11, circumferentially around the periphery of the bottom surface portion 1, and extends around the entire circumference of the gusseted bag body 11. As shown in Figures 1 to 3 and Figure 7, the bottom joint portion 22 protrudes downward from the bottom surface portion 1. This allows the gusseted bag body 11 to stand on its own, with the bottom joint portion 22 acting as its legs.

[0042] The front portion 3 and the rear portion 4 are connected to the inner edge of the bottom joint portion 22, and the inner edge of the bottom joint portion 22 coincides with the long side 1A of the bottom portion 1. Therefore, the front portion 3 and the rear portion 4 are connected to the bottom portion 1 via the bottom joint portion 22.

[0043] Next, the chuck portion 12 will be described with reference to Figures 8 to 10. The chuck portion 12 is formed on the inner surface of the opening 9. In this embodiment, the chuck portion 12 includes a pair of identically shaped chuck portions 12A and 12B, each having engaging projections 122 and 126 that fit together with each other, as shown in Figures 8(A) and (B).

[0044] The shape and number of rows of the engaging projections 122 of the chuck portion 12A are not particularly limited, but for example, the chuck portion 12A has a base end wall portion 123 of a certain thickness that extends vertically from the base portion 121, and a projection with an anchor-shaped cross-section that is connected to the top of the base end wall portion 123 as a wide claw portion 124, and each of the four rows of engaging projections 122 extending linearly in parallel. Similarly, the shape and number of rows of the engaging projections 126 of the chuck portion 12B are not particularly limited, but for example, the chuck portion 12B has a base end wall portion 127 of a certain thickness that extends vertically from the base portion 125, and a projection with an anchor-shaped cross-section that is connected to the top of the base end wall portion 127 as a wide claw portion 128, and each of the four rows of engaging projections 126 extending linearly in parallel.

[0045] In this embodiment, the chuck portion 12A is joined to the film of the gusset bag 11 by welding a joint portion 121A located outward from the engaging projection portion 122 on the back surface of the base portion 121 when viewed along the longitudinal direction. Furthermore, the chuck portion 12B is joined to the film of the gusset bag 11 by welding a joint portion 125A located outward from the engaging projection portion 126 on the back surface of the base portion 125 when viewed along the longitudinal direction.

[0046] The material forming the chuck portion 12 can be arbitrarily set, but for example, it is preferable that at least the layers of the base portions 121 and 125 facing the gusseted bag 11 be made of a resin that can be heat-sealed to the heat-sealable layer, which is the innermost layer of the film forming the gusseted bag 11. Furthermore, the material of the engaging projections 122 and 126 is not particularly limited, but it is preferable to use polyolefin resin, and among them polyethylene resin in particular, because it provides flexibility and ease of engagement.

[0047] In the area where the chuck portion 12 is sandwiched by the side joint portion 52, it melts together with the side joint portion 52, crushing the engaging protrusions 122 and 126, thereby preventing insufficient bonding strength of the side joint portion 52 in the area where it overlaps with the chuck portion 12. For this reason, in the area where the side joint portion 52 overlaps with the engaging protrusions 122 and 126, it is integrated by melting due to heat as shown in Figure 10(A), and has a partially joined area with a partially strong seal. However, in the case where there are multiple rows of engaging protrusions 122 and 126 as in this embodiment, a large amount of resin is melted when the engaging protrusions 122 and 126 are crushed, and it is possible that crushing alone may not be enough to suppress insufficient bonding strength. Therefore, in the area where the chuck portion 12 overlaps with the side joint portion 52, the engaging protrusions 122 and 126 may be removed in advance before welding to the film.

[0048] As shown in Figure 1, the chuck portion 12A extends from one side joint portion 52 through the front side region 53 of the left side portion 7, the front side region 53 of the front portion 3 and the right side portion 6, to the other side joint portion 52, and is positioned around half of the inner circumferential surface on the front side of the cylindrical portion 8. The chuck portion 12B extends from one side joint portion 52, through the rear side region 54 of the left side portion 7, the rear portion 4, and the rear side region 54 of the right side portion 6, to the other side joint portion 52, and is positioned around half of the inner circumference of the rear side of the cylindrical portion 8.

[0049] The chuck portions 12A and 12B are able to fit together because the engaging projection 126 of chuck portion 12B fits into the groove between the engaging projections 122, 122 of chuck portion 12A, and the engaging projection 122 of chuck portion 12A fits into the groove between the engaging projections 126, 126 of chuck portion 12B.

[0050] For example, as shown in Figures 2(A) and (B), when the side gusset 51 is made to protrude outward from the gusset bag body 11 to close the opening 9, the opening 9 takes on a shape similar to that of a flat bag with side joints 52, 52 at both ends. That is, with side joints 52, 52 at both ends, the front side region 53 of the left side portion 7, the front portion 3 and the front side region 53 of the right side portion 6 become one surface, and the rear side region 54 of the left side portion 7, the rear portion 4 and the rear side region 54 of the right side portion 6 become the other surface opposite the first surface, resulting in a shape similar to that of a flat bag. In this case, the zipper portions 12A and 12B each extend into a single piece, and the zipper portion 12A and zipper portion 12B fit together to close the opening 9 without any gaps.

[0051] Furthermore, it is possible to fit two chuck parts 12A together by having the engaging projection 122 of one chuck part 12A fit into the groove between the engaging projections 122, 122 of the other chuck part 12A. Similarly, it is possible to fit two chuck parts 12B together by having the engaging projection 126 of one chuck part 12B fit into the groove between the engaging projections 126, 126 of the other chuck part 12B.

[0052] Here, when fitting together zipper portions 12A or zipper portions 12B, for example, as shown in Figures 3(A) and (B), the side gusset 51 may be folded and protrude inward from the gusset bag 11 to close the opening 9. In this case, on both sides in the width direction of the gusset bag 11, the opening 9 is such that the front portion 53 of the side portion 5 faces the front portion 3, and the rear portion 54 faces the rear portion 4, so that the side portion 5 and the flat portion 2 face each other. At the position where the front portion 53 and the front portion 3 face each other, the zipper portions 12A fit together, and at the position where the rear portion 54 and the rear portion 4 face each other, the zipper portions 12B fit together. On the other hand, at the center in the width direction of the gusset bag 11, the opening 9 is such that the front portion 3 and the rear portion 4 face each other, and the zipper portions 12A and 12B fit together. In this case, the opening 9 can be closed by fitting together the chuck parts 12A with each other, the chuck parts B with each other, and the chuck part A and the chuck part B, as described above.

[0053] Thus, the zipper portion 12A and the zipper portion 12B are zipper portions 12 of the same shape, with their respective engaging projections 122 and 126 being able to fit together. Therefore, as shown in Figures 2(A) and (B), the zippered gusset bag body 10 of this embodiment can also be used to close the opening 9 by projecting the side gusset 51 outward from the gusset bag body 11, and as shown in Figures 3(A) and (B), the side gusset 51 can also be projected inward from the gusset bag body 11, and the gusset can be folded to close the opening 9.

[0054] In this embodiment, as shown in Figure 9(A), the chuck portions 12A and 12B have multiple notches 12C formed on the engaging projections 122 and 126 at intervals P in a direction intersecting the longitudinal direction of the chuck portion 12.

[0055] Here, we will describe the configuration of a comparative example to the zippered gusset bag 10 of this embodiment. The difference between the configuration of the comparative example and the configuration of the zippered gusset bag 10 of this embodiment is the presence or absence of a notch formed in the zipper portion 12.

[0056] As shown in Figure 10(B), the comparative example zippered gusset bag 10A differs from the zippered gusset bag 10 of this embodiment only in that the zipper portion 112 does not have a notch formed therein. In the comparative example, the zippered gusset bag 10A, as shown in Figure 10(B), when attempting to close the opening by folding the side gusset 51 so that it protrudes inward from the gusset bag 11A, the gusset bag 11A is bent nearly 180° at the boundary 15 between the side joint 52 and the side portion 5, with the linear zipper portion 112 facing outward.

[0057] Since the side joint 52 is formed by joining two regions of the side portion 5 equipped with the chuck portion 112, at the boundary between the side joint 52 and the side portion 5, the films are folded nearly 180° with the linear chuck portion 112 facing outwards, and the two films overlap side by side. Because the chuck portion 112, which is bent outwards in this way, is designed to face the chuck portion 112 provided on each of the pair of flat portions, the chuck portion 112 is bent and curved to a large extent, and the overlapping of the films equipped with the chuck portion 112 makes it bulky, resulting in a gap S1 that cannot be created between the opposing chuck portions 112, as shown in Figure 10(B). Furthermore, at the boundary line 10L between the flat section 2 and the side section 5, the chuck section 112 is bent inward by nearly 180° and curved, so the opposing chuck sections 112 cannot be brought close together, resulting in a gap S2. Thus, in the case of the comparative example gusseted bag 10A with a zipper, the opposing zipper portions 112 cannot fit together properly, resulting in gaps S1 and S2, which prevent the opening 9 from being adequately sealed.

[0058] Therefore, it is conceivable to provide only one notch in the zipper portion 112 at a position corresponding to the folded portion. However, with only one notch, it is not easy to fold it nearly 180°. Furthermore, in a gusseted bag 11A having a side joint portion 52, if the film with the zipper portion 112 is folded nearly 180°, the thickness of the zipper portion 112 will overlap with the overlapping film, so a gap S will still be created when the opening 9 of the gusseted bag 11A is closed. Moreover, if there is only one notch at the folding position, and the position of the notch is off from the intended folding position of the gusseted bag 11A, the gusseted bag 11A will fold at the position of the notch, and the shape of the gusseted bag 11A will be distorted.

[0059] In contrast, the gusseted bag body 10 with a zipper of this embodiment, as shown in Figure 9(A), has multiple notches 12C formed in the engaging projections 122 and 126 at intervals P in the longitudinal direction of the zipper portion 12. The notches 12C are formed perpendicular to the longitudinal direction of the zipper portion 12. Note that the notches 12C may be formed at an intersection angle other than 90° with the longitudinal direction of the zipper portion 12. The notches 12C are formed, for example, by cutting the engaging projections 122 and 126 with a cutter. In Figure 9(A), the gaps caused by the notches 12C formed by the cutter are shown enlarged for easier viewing.

[0060] In this embodiment, the notches 12C are arranged along the entire length of the chuck portion 12. The notches 12C only need to be provided in multiple locations corresponding to the folding positions of the gusset bag 11. They should be provided in a predetermined range including at least the boundary 15 between the side joint 52 and the front and rear regions 53 and 54 (see Figure 10(A)), a predetermined range including the boundary line 10L, and a predetermined range including the position corresponding to the flat portion 2 facing the boundary 15 between the side joint 52 and the front and rear regions 54 when the opening 9 is closed with the side gusset 51 protruding inward from the gusset bag 11 and the side portion 5 folded.

[0061] In the chuck portion 12 of this embodiment, the space between the notches 12C of the engaging projections 122 and 126 is provided by an engaging projection piece 13, and the engaging projections 122 and 126 each constitute a plurality of engaging projection pieces 13 in the longitudinal direction. That is, the chuck portions 12A and 12B each have a plurality of engaging projection pieces 13. In the chuck portion 12 of this embodiment, the opening 9 can be closed by fitting the opposing engaging projection pieces 13 together.

[0062] In this embodiment, the chuck portion 12A has notches 12C arranged at intervals PA in the longitudinal direction, and the chuck portion 12B has notches 12C arranged at intervals PB in the longitudinal direction. The spacing PA of the chuck portion 12A and the spacing PB of the chuck portion 12B may be set to the same dimension or to different dimensions. The shorter the spacing PA and PB, and the shorter the length of each engaging projection 13, the greater the number of engaging projections 13. Therefore, the shorter the spacing PA and PB, the more engaging projections 13 engage when the chuck parts 12 are engaged together, producing a louder sound, making it easier to recognize that the chuck parts 12 are securely engaged and the opening 9 is closed. Similarly, when disengaging the chuck parts 12, many engaging projections 13 are disengaged, producing a louder sound, allowing the user to recognize that the chuck parts 12 have been securely disengaged and the opening 9 is open, even by sound alone.

[0063] In this embodiment, the notches 12C are formed at intervals of 1 mm to 3 mm. When the intervals of the notches 12C are set to 1 mm to 3 mm, the opening 9 can be opened and closed easily and stably.

[0064] Here, if the spacing between the notches 12C is 1 mm or more, the length of each engaging projection 13 formed between the notches 12C will be 1 mm or more. If the length of each engaging projection 13 is 1 mm or more, it is less likely that problems will occur where the engaging projections 13 are too short and do not engage with each other. Therefore, by reliably engaging the opposing engaging projections 13 with each other, the opening 9 can be closed properly.

[0065] On the other hand, if the spacing between the notches 12C is greater than 3 mm, and the notches 12C are misaligned with the intended folding area, the gusset bag 11 may be closed in a distorted state. In contrast, in this embodiment, by setting the spacing between the notches 12C to 3 mm or less, even if the notches 12C are misaligned with the intended folding area, it is possible to suppress the gusset bag 11 from being closed in a significantly distorted state.

[0066] The depth of the notch 12C in the chuck portion 12 is not particularly limited, as long as it is not deep enough to completely separate the chuck portion 12. For example, as shown in Figure 9(B), the notch may be deep enough to separate only the engaging projections 122 and 126 while also extending to the base portions 121 and 125. Furthermore, a portion of the notch 12C may penetrate the base portions 121 and 125, as long as it does not completely separate the chuck portion 12.

[0067] In the zippered gusset bag 10 of this embodiment, as shown in Figure 10(A), when the side gusset 51 is folded inward and protrudes from the gusset bag 11 to close the opening 9, the engaging projections 122 and 126 at the boundary 15 between the front side region 53 and the rear side region 54 of the side portion 5 and the side joint portion 52 bend significantly by nearly 180° without curving outward.

[0068] In this embodiment, the chuck portion 12 has multiple notches 12C formed in a direction intersecting the longitudinal direction of the engaging projections 122 and 126. Therefore, even if the gusset bag 11 is folded to nearly 180 degrees, each notch 12C of the chuck portion 12 expands, allowing it to easily fold using one of the notches 12C as a pivot point. As a result, the chuck portion 12 does not curve and easily folds following the gusset bag 11. At this time, the flat portion 2 facing the boundary 15 also folds, but the chuck portions 12 provided on the pair of flat portions 2 also have multiple notches 12C arranged at intervals P, so each notch 12C expands and does not curve, allowing it to easily fold using these notches 12C as pivot points.

[0069] In the chuck portion 12 of this embodiment, the spaces between each notch 12C are provided by a plurality of short, linear engaging projections 13, and each of the engaging projections 13 corresponding to the bending position engages with the opposing engaging projection 13 or engaging projections 122, 126. Therefore, the gap can be reduced and the opening 9 can be closed as shown in Figure 10(A).

[0070] Furthermore, at the boundary line 10L between the front portion 3 and the side portion 5, or between the rear portion 4 and the side portion 5, the chuck portion 12 is bent so that the engaging projections 122 and 126 face inward. At this time, the chuck portion 12 can be easily bent even when the engaging projections 122 and 126 face inward, thanks to the multiple notches 12C provided in the chuck portion 12, and the engaging projection pieces 13 near the boundary line 10L fit together, so that the gap of the opening 9 can be reduced and closed even near the boundary line 10L, as shown in Figure 10(A).

[0071] Furthermore, with the zippered gusset bag 10 of this embodiment, the gusset bag 11 can be easily folded at any position within the range where the multiple notches 12C are provided. This makes it possible to easily fold the gusset bag 11 at the intended folding position, preventing it from becoming misshapen when folded and resulting in a superior aesthetic appearance when folded. Even if the folding position of the film is slightly off when closing the opening 9, the area around the intended folding position is easily foldable due to one of the notches 12C, allowing the opening 9 to be closed with a smaller gap. Furthermore, since the zippered gusset bag 10 can be easily bent using the notched portion 12C as a pivot point, the opening 9 can be easily maintained in a wide, rectangular shape.

[0072] Furthermore, since the chuck portion 12 of this embodiment has multiple rows of engaging projections 122 and 126, even if some engaging projections 13 do not engage in a portion of the longitudinal direction of the chuck portion 12, other engaging projections 13 that are shifted in the row direction will engage with each other, thereby ensuring that the opening 9 is securely closed.

[0073] <Method for manufacturing a gusseted bag with a zipper> Next, an example of a manufacturing method for the zippered gusset bag 10 of this embodiment will be described. Figure 11 is a front view of the flat bag 10B according to this embodiment.

[0074] The zippered gusseted bag 10 is manufactured by deforming a flat bag 10B formed from a zippered film. The method for manufacturing the zippered gusseted bag 10 includes manufacturing it from a pre-manufactured flat bag 10B, and manufacturing the zippered gusseted bag 10 either continuously or not continuously after the process of manufacturing the flat bag 10B. The method for manufacturing the zippered gusset bag 10 comprises (1) a zippered film formation step, (2) a flat bag formation step, (3) a flat bag expansion step, (4) a folding step, and (5) a corner joint formation step. Each step will be described below.

[0075] (1) Film formation process with zipper First, multiple notches 12C are formed on the long material of the chuck portion 12, in a direction perpendicular to the longitudinal direction of the engaging projections, and spaced apart from the engaging projections 122 and 126. Specifically, the long material of the chuck portion 12 is cut in a direction perpendicular to the longitudinal direction using a cutter or the like to form a plurality of notches 12C that are spaced apart in the longitudinal direction. At this time, the spacing of the notches 12C can be set arbitrarily, but it is preferable to set it to, for example, 1 mm or more and 3 mm or less. Alternatively, the notches 12C may be formed in the long material of the chuck portion 12 at an intersection angle other than perpendicular to the longitudinal direction. Next, a long strip of film is formed, and multiple notches 12C are formed along the longitudinal direction of the chuck portion 12. These long strips of material are then joined together by heat welding to form a long chuck-equipped film (not shown). Specifically, a long material with linear chuck sections 12 is joined by welding to the vicinity of both ends in the width direction of a single film whose width dimension, when viewed along the longitudinal direction, is the sum of the dimensions of a pair of flat sections 2, a bottom section 1, and two bottom joint sections 22 that were unfolded before joining.

[0076] (2) Flat bag forming process A flat bag 10B, which can become a zippered gusseted bag 10, is formed from a single zippered film. The flat bag 10B is formed by folding a single zippered film into a W shape and then joining predetermined locations. As shown in Figure 11, the flat bag 10B has a pair of base portions 20 which will later become a pair of flat portions 2, 2 and a pair of side portions 5, 5, a bottom gusset 21, a side joint portion 52, a bottom joint portion 22, and an inclined joint portion 55. In Figure 11, the dashed line indicates the boundary line 10L between the later formed flat portions 2 and side portions 5, and the reference numerals (2) and (5) indicate the regions which will later constitute the flat portions 2 and side portions 5.

[0077] In the process of forming the flat bag 10B, first, a bottom gusset 21 is formed by folding a single resealable film into a W-shape. The bottom gusset 21 of the flat bag 10B becomes the bottom surface portion 1 and the folded portion 24 of the resealable gusset bag body 10. The bottom gusset 21 is a double fold that protrudes inward into the bag. The bottom gusset 21 is formed between a pair of base portions 20 that are formed by folding the resealable film. The pair of base portions 20 of the flat bag 10B become a pair of flat portions 2 and a pair of side portions 5 of the resealable gusset bag body 10.

[0078] Next, a side joint 52 is formed by joining the edges of both ends of the pair of base portions 20. At the position where the bottom gussets 21 overlap, the base portion 20 and the bottom gusset 21 are joined at the side joint 52. When joining the bottom gussets 21 at the position where the bottom gussets 21 overlap, joining can be done by applying a heat-sealable coating agent to the base material layer of the film at least at that position and welding, joining by using a base material layer having a heat-sealable layer and welding, or joining with an adhesive. Next, a bottom joint 22 is formed by joining the boundary between the pair of base portions 20 and the bottom gusset 21. Both ends of the bottom joint 22 are connected to the side joint 52. The bottom joint 22 is provided on one side and the other side of the pair of base portions 20.

[0079] Next, an inclined joint 55 is formed to connect the side joint 52 and the bottom joint 22 at an angle. The inclined joint 55 connects the base 20 and the bottom gusset 21. At this time, the inclination angle of the inclined joint 55 with respect to the bottom joint 22 is approximately 45°. The end of the inclined joint 55 on the side joint 52 side is provided at a position equivalent to the fold line of the bottom gusset 21 in the longitudinal direction of the side joint 52.

[0080] The aforementioned side joint 52, bottom joint 22, and inclined joint 55 are formed by fusing and joining the heat-sealable layers of the chuck-equipped film together. The order in which the side joint 52, bottom joint 22, and inclined joint 55 are formed is not limited to the order described above. The side joint 52, bottom joint 22, and inclined joint 55 may be formed simultaneously.

[0081] (3) Flat bag expansion process In the flat bag expansion process, the flat bag 10B is expanded by separating the pair of base portions 20 of the flat bag 10B so that an isosceles triangular folded portion 24 is formed along the inclined joint portion 55.

[0082] First, the pair of base portions 20 of the flat bag 10B are separated from each other and bent along the four boundary lines 10L. This forms the front portion 3, the rear portion 4, and the pair of side portions 5 from the pair of base portions 20. Furthermore, a rectangular bottom portion 1 is formed on the side opposite to the opening 9. In addition, as the pair of base portions 20 are separated, an isosceles triangular folded portion 24 is formed along the inclined joint portion 55. At this stage, a gusseted bag body 11 without corner joint portions 14 is formed from the expanded flat bag 10B.

[0083] (4) Folding process In the folding process, after the unfolding process, the pair of side portions 5 and the bottom portion 1 are made to protrude inward towards the bag, and the front portion 3 and the rear portion 4 are brought into close contact, thereby forming the bottom gusset 21 and side gussets 51 as shown in Figure 7, and a folded zippered gusset bag is formed. However, at this point, the zippered gusset bag 10 shown in Figure 7 does not have the four corner joints 14.

[0084] (5) Four corner joint formation process In the corner joint formation process, corner joints 14 are formed along four boundary lines 10L, which are the boundaries between a pair of flat sections 2 and a pair of side sections 5 of the zippered gusset bag, extending down to below the zipper section 12. As shown in Figure 1, the corner joints 14 have a height in the height direction of the zippered gusset bag that extends below the lower end 12T of the zipper section 12. The corner joints 14 are formed by fusing the heat-sealable layers of the film of the zippered gusset bag together, similar to other joints. By forming the corner joints 14 on the zippered gusset bag, the zippered gusset bag 10 is completed.

[0085] The gusseted bag body 10 with a zipper is filled with contents such as stick-shaped contents, powdered contents, or granular contents, such as instant coffee or sugar, to form a gusseted bag package 100. The filling of the contents may be carried out as a contents filling process immediately following the corner joint formation process, or it may be carried out after the gusseted bag body 10 with a zipper is set separately in a filling machine.

[0086] According to the gusseted bag packaging 100 of this embodiment, the gap in the opening 9 can be reduced to a degree that does not pose a practical problem, thus providing excellent preservation of the contents. The size of the opening 9 is sufficiently large, allowing for easy and efficient insertion and removal of the contents, and the packaging can stand upright stably.

[0087] As described above, the gusseted bag body 10 with a zipper according to this embodiment has multiple notches 12C formed in the zipper portion 12, thereby forming multiple engaging projections 13 in the longitudinal direction of the engaging projections 122 and 126. This makes it easy to fold the bag body 10 at the boundary 15 between the side joint portion 52 and the front portion side region 53 or the rear portion side region 54, or at the position of the boundary line 10L, or when the side gusset 51 is folded to protrude inward from the gusseted bag body 11 as shown in Figures 3(A) and (B) to close the opening 9, and by engaging each engaging projection 13 with each other, the gap of the opening 9 can be reduced and the bag body 10 can be closed. In addition, the notches 12C act as a base point for easy folding, allowing the opening 9 to be kept wide open. Therefore, according to this embodiment, even with the side joint portion 52, it is possible to provide a zippered gusset bag 10 that can securely enlarge the opening 9 and tightly seal the opening 9 while suppressing the occurrence of gaps.

[0088] Although embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the contents of the above embodiments. It is possible to make various changes to or delete each component, or to change the combination of each component beyond the embodiments, without departing from the spirit of the present invention.

[0089] For example, in the above embodiment, the case in which the spacing of the notches 12C is set to 1 mm or more and 3 mm or less was described, but the spacing of the notches 12C can be set arbitrarily, and for example, the spacing of the notches 12C may be set to less than 1 mm or greater than 3 mm.

[0090] For example, in the above embodiment, the case in which the notches 12C are arranged endlessly along the entire length of the chuck portion 12 was described, but for example, the notches 12C may be formed only at positions (ranges) on both sides of the side joint portion 52.

[0091] Furthermore, although the above embodiment described a case in which the chuck portion 12 has three rows of linear engaging protrusions, the number of engaging protrusions is not limited to three rows, and a configuration with two rows or four or more engaging protrusions is also possible. Furthermore, although the above embodiment described a case in which the chuck portion 12 is equipped with male engaging projections 122 and 126 arranged opposite each other, female engaging projections may also be used, or the number of projections may be arbitrarily set within a range that allows the front portion 3 and the rear portion 4 to be opened and closed by engagement.

[0092] Furthermore, although the above embodiment described a case having a bottom portion 1, a configuration without a bottom portion 1 is also possible. For example, a gusseted bag with a zipper may be used in which the bottom is formed by folding a flat portion without providing a bottom portion.

[0093] Furthermore, although the above embodiment described a case in which four corner joints 14 are provided at the four corners of the cylindrical portion 8, whether or not four corner joints 14 are provided at the four corners of the cylindrical portion 8 can be set arbitrarily, and as shown in Figure 12, a configuration in which four corner joints 14 are not formed is also possible. In addition, although the above embodiment described a case in which the four corner joints 14 are formed only in the area below the lower end 12T of the zipper portion 12 (towards the bottom surface portion 1), so-called case in which only lower four corner joints are present, upper four corner joints that do not overlap with the zipper portion 12 may also be formed in the area above the upper end of the zipper portion 12. In this case, by having four corner joints above and below the zipper portion 12 at the four corners, the folding positions of the four corners of the zippered gusset bag become clearer, making it easier to fold, and the position in which the zipper portion 12 is fitted is determined, resulting in excellent shape retention, a superior appearance, and the ability to stand stably on its own.

[0094] Furthermore, although the above embodiment described a case in which the side portion 5 is connected to the bottom portion 1 via the folded portion 24, whether or not the side portion 5 is connected to the bottom portion 1 via the folded portion 24 can be set arbitrarily, and the side portion 5 may be connected to the bottom portion 1 without using the folded portion 24.

[0095] Alternatively, the side joint portion 52 may be folded over the side portion 5 and fixed in place by joining it with the side portion 5 in at least a portion of it.

[0096] Furthermore, without departing from the spirit of the present invention, the components in the embodiments described above may be replaced with well-known components, and the embodiments described above may be combined as appropriate. [Explanation of Symbols]

[0097] 1...Bottom part, 2...Flat part, 3...Front part, 4...Rear part, 5...Side part, 6...Right side part (one of a pair of side parts), 7...Left side part (the other of a pair of side parts), 8...Cylindrical part, 9...Opening, 10...Gusseted bag with zipper, 11...Gusseted bag, 12,12A,12B...Zipper part, 12C...Notch part, 14...Four corner joints, 51...Side gusset, 52...Side joint, 53...Front side area (first area), 54...Rear side area (second area), 100...Gusseted bag packaging, 121A,125A...Joint part, 122,126...Engaging projection, P,PA,PB...Spacing.

Claims

1. A gusseted bag with a zipper, formed from a single rectangular film, A pair of flat sections consisting of a front section and a rear section, It has a side gusset made of a gusset-like fold, and connects the front portion and the rear portion to form a cylindrical portion having a rectangular cross-section together with the pair of flat portions, consisting of a left side portion and a right side portion, A first region on the front side and a second region on the rear side of the pair of side portions are joined, and a side joint portion is formed in the center of the side portion, projecting outward along the vertical direction, An opening is provided at one end of the cylindrical portion, A gusseted bag having, The opening comprises a pair of linear chuck portions of the same shape having engaging projections, The aforementioned chuck portion is, The chuck portions can be fitted together with each other and with identical chuck portions, and the engaging projection is crushed and melted together with the side joint at a position sandwiched between the side joints. One of the chuck portions extends from one of the side joint portions, through the front side region of the left side portion, the front portion, and the front side region of the right side portion, to the other side joint portion, and is positioned around half of the inner circumferential surface on the front side of the cylindrical portion. The other chuck portion extends from one side joint through the rear side region of the left side portion, the rear portion, and the rear side region of the right side portion to the other side joint, and is arranged around half of the inner circumferential surface on the rear side of the cylindrical portion. The chuck portion has a plurality of notches arranged at regular intervals along the entire length of the chuck portion in a direction intersecting the longitudinal direction in which the engaging projection extends, The engagement projection can be bent 180°, with any of the aforementioned multiple notches acting as a pivot point, so that it is folded back either outward or inward. A gusseted bag with a zipper, characterized by the following features.

2. A gusseted bag with a zipper according to claim 1, The aforementioned cut portion is They are formed at intervals of 1 mm to 3 mm. A gusseted bag with a zipper, characterized by the following features.

3. A gusseted bag with a zipper according to claim 1 or 2, A zippered gusset bag characterized in that, at the four corners of the cylindrical portion connecting the pair of planar portions and the pair of side portions, the four corner joints are located below the zipper portion in the vertical direction.

4. A gusseted bag with a zipper according to claim 1 or 2, The other end of the cylindrical portion has a bottom surface. A gusseted bag with a zipper, characterized by the following features.

5. A gusseted resealable bag packaging containing contents, wherein the contents are contained in a gusseted resealable bag according to claim 1 or 2.

Images