Gusset bag with zipper and gusset bag package

Abstract

To provide a gazette bag body with a zipper that can secure a sufficient size of an opening part and stably stand by itself, and a gazette bag package.SOLUTION: There is provided a gazette 10, which comprises: a gazette bag body 11 having a pair of plane parts 2 formed of front parts 3 and rear parts 4, a pair of side parts 5 forming a cylindrical part 8 connecting the front parts 3 and rear parts 4, an opening part 9 opened at an upper part of the cylindrical part 8, and a side gazette 51, and four corner joint parts 14; and a linear zipper part 12, wherein the four corner joint parts 14 are formed within a range up to below a lower end of the zipper part 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gusset bag with a zipper and a gusset bag package. [Background technology]

[0002] As is well known, in order to increase the internal volume of a packaging bag, a gusset bag is known, which has a gusset-like side portion connecting a front portion and a rear portion that constitute a pair of flat portions. Such a gusset bag has the advantage that the opening can be made large by expanding the side portion. Furthermore, gusset bags that have a zipper near the opening so that the opening can be freely opened and closed are widely used.

[0003] For example, when providing a zipper portion on a gusset bag having a gusset-shaped side portion, the side portion is provided from the bottom of the bag body to the bottom of the zipper portion, and zipper portions having male and female types are arranged on each of a pair of flat portions, just like bags without side portions (see, for example, Patent Document 1).

[0004] Furthermore, when a zipper portion is provided on a gusset bag having a gusset-shaped side portion, the side portion is formed over the entire vertical length from the bottom of the bag body to the opening, and the side portion is pressed against one of the flat portions (e.g., the rear surface), with one of the zipper portions having a male and female type being positioned over the entire width direction length of the pair of flat portions to which the side portion is not pressed (e.g., the front surface), and the other being positioned on the flat portion to which the side portion is pressed (e.g., the rear surface) (see, for example, Patent Document 2).

[0005] However, although the zippered gusseted bags disclosed in Patent Documents 1 and 2 have a pair of flat surfaces and a pair of side surfaces, the opening is composed of only the pair of flat surfaces, making it difficult to increase the opening area.

[0006] Therefore, a gusseted bag with a zipper has been developed, which does not restrict the opening of the opening (see Patent Documents 3 and 4). For example, the zippered gusset bag described in Patent Document 3 has zipper sections with matable male and female parts arranged on the surfaces that face each other when the side sections are folded, allowing the zipper sections to be mated while the side sections are folded in. As male and female zipper sections are arranged on each of the pair of flat surfaces, the side sections have a male zipper section on one side and a female zipper section on the other, with the gusset-like V-shaped fold line as the boundary, and it is thought that the manufacturing process is complicated.

[0007] Furthermore, the zippered gusset bag described in Patent Document 4 has linear zipper portions provided around the periphery of a pair of flat portions and a pair of side portions near the opening. These linear zipper portions have two or more anchor-shaped protrusions as claws, and can be fitted in any position. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-010055 [Patent Document 2] Japanese Patent Application Publication No. 8-282689 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-006103 [Patent Document 4] Japanese Patent Application Laid-Open No. 2006-290373 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the zippered gusset bag described in Patent Document 4 has a zipper near the opening, making the top heavy. Furthermore, the only joining portion extending vertically is the back panel, so it lacks sufficient self-standing ability when the contents are lightweight. The zippered gusset bag described in Patent Document 4 is manufactured by folding a cylindrical base film with a back panel into a V-shape at the side gusset folds to form side gussets, sealing the top and bottom, and then cutting to a specified length. The side gussets are folded, and the four corners of the gusset bag, which are the boundaries between the side gussets, the front panel, and the back panel, are simply folded. After the zippered gusset bag is filled with contents, the side gussets expand. When the contents are powdery, for example, the fold lines at the four corners of the bag become gentle curves and lack clear fold lines. This makes it unclear where to fit the zipper, making it difficult to seal the bag and resulting in a poor appearance.

[0010] The present invention has been made in consideration of the above circumstances, and aims to provide a gusset bag body with a zipper, and a gusset bag package, which have a clear folding position even at the zipper part, are easy to fold, and do not leave the fitting position of the zipper part unclear, have an excellent appearance, and can stand stably on its own. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a gusset bag with a zipper, comprising: a pair of flat surfaces consisting of a front surface and a rear surface; a pair of side surfaces connecting the front surface and the rear surface and having a gusset-like fold to form a tubular portion with a rectangular cross section together with the pair of flat surfaces; an opening formed at one end of the tubular portion; and four-corner joints formed at four corners of the tubular portion located at both widthwise ends of the pair of flat surfaces and both widthwise ends of the pair of side surfaces; and a linear zipper portion formed in the circumferential direction of the tubular portion below the opening, wherein the four-corner joints are formed in a range extending below the zipper portions.

[0012] According to the gusset bag with a zipper of this invention, the four corners of the gusset bag have four-corner joints, so the folding positions of the four corners are clear even at the position of the zipper, making it easy to fold, and the fitting position of the zipper is not unclear, so it has an excellent appearance and can stand on its own stably. Also, because the four-corner joints are formed below the zipper, there are no four-corner joints at the opening, so a large opening can be ensured. Here, the lower end of the zipper portion refers to the bottommost part of the zippered gusset bag in the vertical direction, including the base of the zipper portion. Similarly, the upper end of the zipper portion, which will be described later, refers to the topmost part of the zippered gusset bag in the vertical direction, including the base of the zipper portion.

[0013] (2) In the zippered gusset bag described in (1) above, the dimension L1 from the lower end of the zipper portion to the upper end of the four-corner joint may be formed to be approximately equal to the dimension L0 from the widthwise end of the side portion to the gusset-shaped fold line.

[0014] According to the gusset bag body with a zipper of this invention, the dimension L1 from the bottom end of the zipper portion to the top end of the four corner joints is formed to be approximately equal to the dimension L0 from the widthwise end of the side portion to the gusset-like fold line. Therefore, when the side gussets protrude outward from the gusset bag body to close the opening while the contents are contained in the gusset bag package, as shown in Figures 2(A) and (B), in the height direction of the gusset bag with a zipper, from the bottom end to the height where the four corner joints are formed, an inclined portion is formed that is inclined at approximately 45° from the top end of the four corner joints toward the intersection of the bottom end of the zipper portion and the gusset-like fold line of the side portion, thereby achieving a design effect. In addition to being able to secure a large opening, when the side gussets are protruded outward from the gusset bag body to close the opening, as shown in Figures 2(A) and (B), the opening is not obstructed by the joints at the four corners, and the two opposing zipper portions can extend in a straight line, allowing the zipper portions to easily fit together. Furthermore, as shown in Figures 3(A) and (B), even when the side portions are protruded toward the inside of the gusset bag body and the gusset is folded to close the opening, the bag is formed into an approximately rectangular parallelepiped of the same shape as the bottom portion from the lower end to the height where the four corner joints are formed, and above the four corner joints, an inclined portion is formed that is inclined at approximately 45° from the upper end of the four corner joints to the intersection of the lower end of the zipper portion and the gusset-like fold line of the side portion, thereby achieving a design effect.

[0015] (3) The zippered gusset bag described in (1) above may have a dimension L1 from the lower end of the zipper portion to the upper end of the four-corner joint, and a dimension L0 from the widthwise end of the side portion to the gusset-shaped fold line, such that dimension L1 ≧ dimension L0.

[0016] According to the zippered gusset bag body of this invention, when the dimension L1 from the lower end of the zipper portion to the upper end of the four corner joint and the dimension L0 from the widthwise end of the side portion to the gusset-shaped fold line side gusset are taken as being equal to or greater than the dimension L0, it is possible to ensure a large opening.In addition, when the side gusset is protruded outward from the gusset bag body to close the opening as shown in Figures 2(A) and (B), the two opposing zipper portions can each extend in a straight line, allowing the zipper portions to easily fit together and close the opening.

[0017] (4) In the zippered gusset bag body described in any one of (1) to (3) above, the side portion may have a side joint portion in the center of the width direction of the side portion, which joins the front portion side region and the rear portion side region along the vertical direction.

[0018] According to the zippered gusset bag body of this invention, there is a side joint portion in the center of the width of the side portion, which joins the front side region and the rear side region along the vertical direction, so that the side joint portion, together with the four corner joints, can improve the self-standing ability.

[0019] (5) In the gusset bag with a zipper described in any one of (1) to (4) above, the zipper portion may have a notch at a position corresponding to a folding position of the gusset bag.

[0020] According to the zippered gusset bag of this invention, the zipper portion has a cut portion at a position corresponding to the folding position of the gusset bag. Therefore, as shown in Figures 3(A) and (B), when the side portion is protruded toward the inside of the gusset bag and the side gusset is folded to close the opening, the zipper portion can also be easily folded at the folded portion using the cut portion as a trigger, so that the folding of the gusset bag is not hindered by the zipper portion and the opening can be sealed substantially without any gaps. Here, the cut portion refers to a portion cut to the extent that the zipper portion can be bent.

[0021] (6) The gusset bag with a zipper described in any one of (1) to (5) above may further include upper four corner joints formed in an area above the zipper portion and not overlapping with the zipper portion.

[0022] According to the zippered gusset bag of this invention, the four corners of the gusset bag have four corner joints above and below the zipper portion, so that the corner folding positions above and below the zipper portion are defined, making the folding positions clearer, making it easier to fold, and the position where the zipper portion fits together is not unclear, resulting in an excellent appearance and allowing the bag to stand stably on its own.

[0023] (7) The gusset bag with a zipper according to any one of (1) to (6) above may have a rectangular bottom surface portion provided at the other end of the tubular portion.

[0024] The gusset bag with a zipper according to the present invention has a rectangular bottom surface, which increases the internal volume and improves its self-standing ability. Furthermore, when the gusset bag with a zipper according to the present invention has side joints and a bottom surface, it is possible to form a gusset bag with a square bottom from a single rectangular film.

[0025] (8) In the zippered gusset bag body described in any one of (1) to (7) above, the zipper portion may have an engaging protrusion portion consisting of multiple rows of protrusions, and the engaging protrusion portion may have the same shape throughout the entire circumference of the tubular portion.

[0026] According to the zippered gusset bag of this invention, the side gusset can be protruded outward from the gusset bag to close the opening, or the side gusset can be protruded inward from the gusset bag to fold the gusset to close the opening.

[0027] (9) In the gusset bag with a zipper described in any one of (1) to (7) above, the zipper portion may be a hook-and-loop fastener that can be either male or female.

[0028] The zippered gusset bag of this invention has excellent flexibility because it is provided with a zipper portion made of a hook-and-loop fastener. Therefore, it can be easily folded without providing a cutout in the zipper portion at the folding location, and the zipper portion does not hinder the folding of the gusset bag. A non-gendered hook-and-loop fastener is closed by the engagement of hook-to-hook engaging portions, but since the zipper portion does not hinder folding, the hooks can stably engage with each other, allowing the opening to be sealed with virtually no gaps.

[0029] (10) A second aspect of the present invention is a gusset bag package in which contents are accommodated in the gusset bag with a zipper according to any one of (1) to (9) above.

[0030] The gusset bag package according to the present invention has an opening large enough to allow the contents to be easily and efficiently put in and taken out, and can stand stably on its own. [Effects of the Invention]

[0031] According to the gusset bag with zipper and the gusset bag package of the present invention, the folding positions of the four corners are clear even at the position of the zipper part, making it easy to fold, and the position where the zipper part fits is not unclear, so it has an excellent appearance, can stand stably, and the opening size is sufficiently secured so that it can be opened and closed freely. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a perspective view illustrating a schematic configuration of a zippered gusset bag according to an embodiment of the present invention; [Figure 2]This is a conceptual diagram illustrating the general configuration of one embodiment of a zippered gusset bag in which contents are placed and the side gusset protrudes outward from the gusset bag to close the opening, (A) showing a front view and (B) showing an oblique view. [Figure 3] This is a conceptual diagram illustrating the general configuration of one embodiment of a zippered gusset bag in which contents are placed and the side gusset protrudes inward to close the opening, (A) showing a front view and (B) showing an oblique view. [Figure 4] 1A and 1B are conceptual diagrams illustrating the schematic configuration of a zippered gusset bag according to one embodiment, in which (A) is a cross-sectional view taken along the line IVA-IVA in FIG. 1, and (B) is a bottom view. [Figure 5] 2 is a cross-sectional view taken along the arrow VV in FIG. 1, illustrating the schematic configuration of a gusseted bag with a zipper according to one embodiment. FIG. [Figure 6] FIG. 2 is a partial perspective view showing the inside of a zippered gusset bag according to one embodiment. [Figure 7] FIG. 2 is a front view of a zippered gusseted bag according to one embodiment with the side gussets folded inward. [Figure 8] 1A and 1B are cross-sectional conceptual diagrams of a linearly extending zipper portion according to one embodiment, in which (A) shows the disengaged state and (B) shows the engaged state. [Figure 9] 1 is a front view illustrating a schematic configuration of a flat bag in a flat bag forming step according to a manufacturing method of one embodiment. FIG. [Figure 10] 10A and 10B are perspective views showing the configuration of a modified example of a gusseted bag with a zipper. [Figure 11] FIG. 10 is a perspective view showing the configuration of a zippered gusset bag according to a modified example in which a cutout portion is provided. [Figure 12] FIG. 10 is a perspective view illustrating the general configuration of a zippered gusset bag according to a modified example in which upper four corner joining portions are provided. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 7 illustrate the schematic configuration of a zippered gusset bag according to this embodiment. FIG. 1 is a perspective view, FIG. 2 is a conceptual diagram of the bag with contents placed inside and the side gussets protruding outward to close the opening, FIG. 3 is a conceptual diagram of the bag with the side gussets protruding inward to close the opening, FIG. 4(A) is a cross-sectional view taken along arrows IVA-IVA in FIG. 1, FIG. 4(B) is a bottom view, FIG. 5 is a cross-sectional view taken along arrows VV in FIG. 1, FIG. 6 is a partial perspective view showing the interior, and FIG. 7 is a front view with the side gussets folded inward. Note that the thickness of the film is omitted in FIGS. 2 and 3. Also, the diagonal lines in FIGS. 1 to 3, 6, and 7 indicate joints, and the diagonal lines in FIGS. 4(A) and 4(B) indicate tubular sections. In these figures, the thickness of the film may be exaggerated to facilitate understanding.

[0034] In the figure, symbol 1 indicates the bottom portion, symbol 2 indicates a pair of flat portions, symbol 3 indicates the front portion, symbol 4 indicates the rear portion, symbol 5 indicates a pair of side portions, symbol 6 indicates the right side portion, symbol 7 indicates the left side portion, symbol 10 indicates a gusset bag body with a zipper, symbol 11 indicates a gusset bag body, symbol 12 indicates a zipper portion, symbol 14 indicates four corner joints, symbol 21 indicates a bottom gusset, symbol 51 indicates a side gusset, symbol 52 indicates a side joint, and symbol 55 indicates an inclined joint.

[0035] As shown in FIG. 1, the gusset bag body 10 with a zipper comprises a gusset bag body 11 and a zipper portion 12.

[0036] The gusset bag body 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-sealing layer. The base layer forms the outermost layer of the laminate, and the heat-sealing layer forms the innermost layer of the laminate. The base layer is formed of a biaxially oriented film or a uniaxially oriented film such as polyethylene terephthalate, polypropylene, or polyamide, which has excellent printability and strength, and may be formed as a single layer or a multilayer using multiple layers. It may also be formed from paper or nonwoven fabric. The heat-sealing layer is formed from an unstretched film or layered resin of a polyethylene-based resin such as a polypropylene-based resin, low-density polyethylene, or linear low-density polyethylene. In addition, to exhibit a gas barrier function of blocking oxygen and water vapor, the above-mentioned film or a vapor-deposited film or metal foil formed by vapor-depositing a metal such as aluminum or a metal oxide such as aluminum oxide or silicon oxide onto the substrate layer may be used as a functional layer in one or more layers between the substrate layer and the heat-sealing layer. These layers are bonded together by a known method such as dry lamination or extrusion lamination to form a laminate. The film is not limited to a laminate, but may be a single-layer film.

[0037] The gusset bag 11 has a pair of flat portions 2 consisting of a front portion 3 and a back portion 4, and side portions 5 with a pair of gusset-like folds, and further has a tubular portion 8 with a rectangular cross section formed by the pair of flat portions 2 and the pair of side portions 5, one end of which is an opening 9 and the other end of which is a bottom portion 1. Furthermore, the gusset bag 11 has four corner joints 14 at the four corners of the rectangular tubular portion 8 and a side joint 52 at the position of the gusset-like fold in the center in the width direction of the side portions 5. In this embodiment, the gusset bag 11 also has a fold-in portion 24 on the inside of the side portions 5 that connects the bottom portion 1 and the side portions 5. Although details will be described later, the chuck portion 12 is linear and is formed in the circumferential direction of the tubular portion 8 below the opening 9. In addition, the four corner joints 14 are formed below the lower end 12T of the chuck portion 12.

[0038] A zippered gusset bag 10 having a zipper portion 12 on a gusset bag 11 may close the opening 9 by causing the side gusset 51 to protrude outward from the gusset bag 11 as shown in Figures 2(A) and (B) after the contents have been placed inside, or may close the opening 9 by causing the side portion 5 to protrude inward from the gusset bag 11 and folding the gusset as shown in Figures 3(A) and (B).

[0039] [Bottom part] As shown in Figures 1 and 4(A), the bottom surface portion 1 is provided at the other end of the tubular portion 8, and has a pair of long sides 1A which are a pair of first opposite sides, and a pair of short sides 1B which are a pair of second opposite sides, and is formed in an approximately rectangular shape when viewed in a plane. A pair of long sides 1A of the bottom surface portion 1 are connected to the front surface portion 3 and the rear surface portion 4 of the pair of flat surface portions 2, respectively. A pair of short sides 1B of the bottom surface portion 1 are connected to respective fold-in portions 24 described below, and are connected to a pair of side surfaces 5 consisting of a right surface portion 6 and a left surface portion 7 via the fold-in portions 24.

[0040] As shown in FIGS. 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 convexly extend inward when the gusset bag body 11 is folded. The bottom gusset 21 has a valley fold 25 that is folded so as to convexly extend inward, and a mountain fold 26 that is folded so as to convexly extend outward. The valley fold 25 is formed at the intermediate portion between the front portion 3 and the rear portion 4, and has a linear portion 25a that is parallel to the front portion 3 and the rear portion 4 and terminates inside the peripheral edge of the bottom portion 1, and V-shaped portions 25b that extend from both ends 25c of the linear portion 25a toward the corresponding corners of the bottom portion 1. The mountain folds 26 extend substantially perpendicularly from both ends 25c of the linear portion 25a of the valley fold 25 toward the short side 1B of the bottom portion 1. By folding the bottom gusset 21 so that it is convex inward, the bottom portion 1 is folded so that the front portion 3 and the rear portion 4 are close to each other.

[0041] [Plane part] The pair of planar portions 2 (hereinafter, sometimes simply referred to as planar portions 2) are made up of a front portion 3 and a rear portion 4, as shown in FIGS. In addition, when viewed from the front, the front portion 3 and the rear portion 4 are formed into a rectangular shape that is long in the vertical direction, and each rises upward from a pair of long sides 1A of the bottom portion 1 via the bottom joint portion 22 described below, and faces each other across the bottom portion 1.

[0042] [Side part] As shown in Figures 1 and 4, the pair of side portions 5 (hereinafter sometimes simply referred to as side portions 5) have a right side portion 6 and a left side portion 7, and have a gusset-like fold, i.e., a side gusset 51, and are folded so as to convex toward the inside of the gusset bag body 11. Further, the right side surface portion 6 and the left side surface portion 7 are formed in a rectangular shape that is long in the vertical direction when viewed from the side. A pair of side portions 5 connect the front portion 3 and the rear portion 4 to form a cylindrical portion 8 with a rectangular cross section that defines an internal storage space consisting of a rectangular parallelepiped that forms the shape of the bottom portion 1.

[0043] As shown in Figures 1, 4, and 6, the side joint 52 connects, in the vertical direction, a front side region 53 located on the front side 3 side of the right side portion 6 and the left side portion 7, and a rear side region 54 located on the rear side 4 side, at the center of the width of the side portion. The front surface region 53 and the rear surface region 54 are connected via a side joint 52 . In the side joining portion 52, the film positioned in the front surface portion side region 53 and the film positioned in the rear surface portion side region 54 are overlapped in the thickness direction and welded together.

[0044] As shown in Fig. 6, an isosceles triangular fold 24 is formed on the inner surface of each side surface portion 5. Fig. 6 shows only the right side surface portion 6 side. Further, when viewed from the inside of the zippered gusset bag 10, the fold-in portion 24 is formed in the shape of a right-angled isosceles triangle with the short side 1B of the bottom portion 1 as the hypotenuse 24L.

[0045] The side surface 5 and the portion where the folded-in portion 24 is formed on the back surface of the zippered gusset bag 10 are formed by three layers of film overlapping in the thickness direction, as shown in FIG. The two outermost films of the three films are joined together by inclined joints 55 (see FIG. 6) formed on the side surface portions 5. In other words, inclined joints 55 are formed along the two equal sides 24M of the isosceles triangle that constitutes the fold-in portion 24, thereby joining the fold-in portion 24 and the side surface portions 5.

[0046] The bottom side end portion 24a, where the outer edge of the inclined joint portion 55 formed with a constant width, which is on the upper side in the vertical direction, intersects with the bottom joint portion 22, forms the corner of the four sides of the bottom portion 1 of the gusset bag body 11.

[0047] This closes the gap between the equal side 24M of the folded-in part 24 and the side part 5, preventing the contents from entering the gap between the folded-in part 24 and the side part 5 when the contents are filled into the zippered gusset bag body 10.

[0048] The four-corner joints 14 join both widthwise sides of the pair of planar portions 2 and both widthwise sides of the pair of side portions 5 at the four corners of the rectangular tubular portion 8 of the gusset bag body 11. The four-corner joints 14 are provided below the zipper portions 12 that are provided in the circumferential direction of the tubular portion 8 below the opening 9. At the portions where the four-corner joints 14 are formed in the vertical direction at the four corners of the rectangular tubular portion 8, the right side portion 6 and the left side portion 7 are connected to the front portion 3 and the rear portion 4, respectively, in the vertical direction via the four-corner joints 14.

[0049] As shown in FIGS. 1 to 3, 6 and 7, the four corner joints 14 are formed in a range below the lower end 12T of the chuck portion 12 (toward the bottom surface portion 1). As a result, the chuck portion 12 is arranged without being sandwiched between the four corner joint portions 14.

[0050] In the vertical direction of the gusset bag body 11, at the four corners of the rectangular tubular portion 8 where the four-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 four-corner joints 14 and their extensions.

[0051] As shown in Figure 7, the four-corner joint 14 is preferably formed so that the dimension L1 from the lower end 12T of the zipper portion 12 to the upper end 14T of the four-corner joint 14 is approximately equal to the dimension L0 from both widthwise ends of the side portion 5 to the gusset-like fold line of the side portion 5. By setting it up in this way, when the side gusset 51 is protruded outward from the gusset bag body 11 to close the opening 9, the gusset bag package 100 in which contents are contained in the gusset bag body 11 with the zippered gusset bag body as shown in Figure 2, in the height direction of the gusset bag body 11, from the lower end to the height where the four corner joints 14 are formed, is formed into an approximately rectangular parallelepiped of the same shape as the bottom surface portion 1, and above the four corner joints 14, an inclined portion is formed that slopes at an angle of approximately 45° from the upper end 14T of the four corner joints 14 to the intersection of the lower end 12T of the zipper portion 12 and the gusset-like fold line of the side surface portion, with the upper end 14T as the base point, thereby achieving a design effect. Furthermore, as shown in Figures 2(A) and (B), when the side gusset 51 is protruded 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 surface, the front portion 3, the front side region 53 of the left side surface, and the rear side region 54 of the right side surface, the rear portion 4, and the rear side region 54 of the left side surface each extend in a straight line, and the two opposing zipper portions 12 can also each extend in a straight line, allowing the zipper portions 12 to be easily fitted together and the opening 9 to be reliably closed.

[0052] Also, as shown in Figure 3, even when the side gusset 51 is protruded toward the inside of the gusset bag body 11 and the gusset is folded to close the opening 9, it is formed into an approximately rectangular parallelepiped of the same shape as the bottom surface portion 1 from the lower end to the height where the four corner joints 14 are formed, and above the four corner joints 14, an inclined portion is formed that slopes at an angle of approximately 45° from the upper end 14T of the four corner joints 14 toward the intersection of the lower end 12T of the zipper portion 12 and the gusset-shaped fold line of the side surface portion, thereby achieving a design effect.

[0053] Furthermore, it is not necessary for the dimensions L1 and L0 to be approximately equal, but as long as the dimensions L1 are greater than or equal to the dimensions L0, when the side gusset 51 is protruded outward from the gusset bag body 11 to close the opening 9, as shown in Figure 2, the opening 9 is not obstructed by the four corner joints 14, and the front side region 53 of the right side portion 6, the front portion 3, the front side region 53 of the left side portion 7, and the rear side region 54 of the right side portion 6, the rear portion 4, and the rear side region 54 of the left side portion 7 can each extend in a straight line, and the two opposing zipper portions 12 can also each extend in a straight line, allowing the zipper portions 12 to be easily fitted together and the opening 9 to be reliably closed, which is preferable. Note that "L1 and L0 are approximately equal" does not necessarily mean L1=L0, but means approximately 0.9·L0≦L1≦1.1·L0.

[0054] Furthermore, it is preferable that the four corner joints 14 are formed so that the upper ends 14T of the four corner joints 14 are aligned with the height (vertical length or filling amount) of the contents to be contained. The shape of the upper ends 14T of the four corner joints 14 is preferably arc-shaped or inclined in either the width direction, as this prevents the film from tearing at the boundary line near the upper ends 14T of the four corner joints 14.

[0055] Moreover, it is preferable that the four corner joints 14 are formed at positions that do not overlap with the inclined joints 55. Specifically, it is preferable that the four corner joints 14 are formed above the inclined joints 55 so as not to come into contact with the inclined joints 55. As a result, the bottom surface portion 1 can expand into a rectangular shape without being hindered by the four corner joints 14.

[0056] As shown in Figures 1 to 3, the gusset bag body 11 has bottom joint portions 22 formed on the lower outer sides of the lower end edges of the front portion 3, rear portion 4, right side portion 6, and left side portion 7, and the four sides of the bottom portion 1, which extend on the same plane as the front portion 3, rear portion 4, right side portion 6, and left side portion 7.

[0057] The bottom joint 22 is formed at the lower end of the gusset bag body 11 in the circumferential direction around the periphery of the bottom surface 1, over the entire periphery of the gusset bag body 11. As shown in Figures 1 to 3 and 7, the bottom joint 22 protrudes downward from the bottom surface 1. This allows the gusset bag body 11 to stand on its own, with the bottom joint 22 acting as feet.

[0058] The front surface portion 3 and the rear surface 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 surface portion 1. Thus, the front surface portion 3 and the rear surface portion 4 are connected to the bottom surface portion 1 via the bottom joint portion 22.

[0059] Next, the chuck portion 12 will be described with reference to Fig. 8. The chuck portion 12 is formed in a linear shape and arranged along the circumferential direction of the cylindrical portion 8 below the opening 9, and Fig. 8 is a conceptual cross-sectional view of the linearly extending chuck portion 12. In this embodiment, the chuck portion 12 has engaging protrusions 121, 125 that have the same shape over the entire circumferential direction of the cylindrical portion 8. That is, the chuck portion 12 is a pair of chuck portions 12A, 12B that have the same shape and have engaging protrusions 121, 125 that fit together. The pair of chuck portions 12A, 12B are clamped and fitted together at the side joint portion 52. One of the chuck portions 12, 12A, extends from one side surface joint 52, passing through a front surface side region 53 of the left side surface portion 7, the front surface portion 3, and the front surface side region 53 of the right side surface portion 6, to the other side surface joint portion 52, and is disposed on half the circumference of the front side of the tubular portion 8. The other chuck portion 12B extends from one side surface joint 52, passing through a rear surface side region 54 of the left side surface portion 7, the rear surface portion 4, and the rear surface side region 54 of the right side surface portion 6, to the other side surface joint portion 52, and is disposed on half the circumference of the rear side of the tubular portion 8.

[0060] Not only can the chuck portions 12A and 12B be fitted together, but the chuck portions 12A can also be fitted together, or the chuck portions 12B can also be fitted together. 2, when the side gusset 51 is protruded outward from the gusset bag body 11 to close the opening 9, the opening 9 has the same shape as a flat bag with side joints 52, 52 at both ends. That is, the opening 9 has the same shape as a flat bag, with the side joints 52, 52 at both ends, the front side region 53 of the left side portion 7 and the front side regions 53 of the front portion 3 and right side portion 6 forming one side, and the rear side region 54 of the left side portion 7 and the rear side regions 54 of the rear portion 4 and right side portion 6 forming the other side opposite the one side. As a result, the zippers 12A and 12B each have a shape that extends in a single line, and the opening 9 can be closed by fitting the zippers 12A and 12B together.

[0061] 3, when the side gussets 51 are protruded inward of the gusset bag body 11 and folded to close the opening 9, the opening 9 is formed on both widthwise sides of the gusset bag body 11 such that the front portion-side region 53 of the side portion 5 faces the front portion 3, the rear portion-side region 54 faces the rear portion 4, and the side portion 5 faces the flat portion 2. Meanwhile, at the widthwise center of the gusset bag body 11, the opening 9 has the shape of a gusset bag in which the front portion 3 faces the rear portion 4. As a result, the opening 9 can be closed by fitting the zipper portions 12A together at the position where the front portion-side region 53 faces the front portion 3, by fitting the zipper portions 12B together at the position where the rear portion-side region 54 faces the rear portion 4, and by fitting the zipper portions 12A and 12B together at the position where the front portion 3 faces the rear portion 4. Since the zipper portions 12A and 12B are zipper portions 12 of the same shape, with their respective engaging protrusions 121, 125 being able to fit into each other, the zippered gusset bag body 10 can close the opening 9 by causing the side gusset 51 to protrude outward from the gusset bag body 11, as shown in Figure 2, or can close the opening 9 by causing the side gusset 51 to protrude inward from the gusset bag body 11 and folding the gusset, as shown in Figure 3.

[0062] 8(A) and 8(B), the chuck portions 12A and 12B have four rows of engaging protrusions 121 and 125 in the width direction on a linearly extending base portion 120, and the engaging protrusions 125 of the chuck portion 12B fit into the grooves between the engaging protrusions 121 and 121 of the chuck portion 12A, and the engaging protrusions 121 of the chuck portion 12A fit into the grooves between the engaging protrusions 125 and 125 of the chuck portion 12B, thereby fitting the chuck portions 12A and 12B together. Also, the engaging protrusions 121 of the chuck portion 12A that face the grooves between the engaging protrusions 121 and 121 of the chuck portion 12A fit into each other, thereby fitting the chuck portions 12A together. Similarly, the engaging protrusions 125 of the chuck parts 12B fit into the grooves between the engaging protrusions 125, 125 of the chuck parts 12B, thereby fitting the chuck parts 12B together.

[0063] The shape and number of rows of the engaging protrusions 121 of the chuck portion 12A are not particularly limited, but the chuck portion 12A of this embodiment has, for example, a base end wall portion 122 of a constant thickness extending vertically from the base portion 120, and wide claw portions 123 connected to the top of the base end wall portion 122 and having an anchor-shaped cross section, and has four rows of engaging protrusions 121 each extending in a linear manner parallel to one another. Similarly, the shape and number of rows of the engaging protrusions 125 of the chuck portion 12B are not particularly limited, but the chuck portion 12B of this embodiment has, for example, a base end wall portion 126 of a constant thickness extending vertically from the base portion 120, and a wide claw portion 127 connected to the top of the base end wall portion 126 and having an anchor-shaped cross section, and has four rows of engaging protrusions 125 each extending in a linear manner parallel to one another. In order for chuck portion 12A to fit with chuck portion 12B, or chuck portions 12A to fit with each other, or chuck portions 12B to fit with each other, it is not necessary for all of the engaging protrusions 121, 125 to fit into all of the grooves; it is sufficient that at least one row of engaging protrusions fits into the grooves.

[0064] The material for forming the zipper portion 12 can be set arbitrarily, but it is preferable that at least the layer of the base portion 120 facing the gusset bag body 11 is formed from a resin that can be heat-sealed to the heat-sealing layer that is the innermost layer of the film that forms the gusset bag body 11. In addition, the material for the engaging protrusions 121 and 125 is not particularly limited, but it is preferable to use polyolefin resin, especially polyethylene resin, because it is flexible and easy to engage.

[0065] Furthermore, as shown in FIG. 3, the zipper portion 12 preferably has a notch 12D, for example, consisting of one or more notches 12C as shown in FIG. 11, at a position where it can be folded to correspond to the gusset bag body 11 when the side gusset 51 is protruded inward from the gusset bag body 11 and folded to close the opening 9. Specifically, the notch 12D is preferably formed at six locations: four boundary lines 10L that form the boundaries between both widthwise sides of the pair of flat portions 2 and both widthwise sides of the pair of side portions 5, and positions corresponding to the gusset-like fold lines of the side portions 5. The formation of the six notches 12D in the zipper portion 12 allows it to be easily folded at the boundary lines 10L and the side gussets 51, and the engaging protrusions engage with each other, allowing the opening 9 to be closed substantially without gaps. Here, "substantially without gaps" means that the contents do not spill out. Each incision 12D may consist of one incision 12C or multiple incisions 12C. In addition, the incision 12D may be provided along the entire length of the linear zipper portion 12. If the incision 12D is provided along the entire length of the linear zipper portion 12, it is not necessary to align the folding position of the gusset bag body 11 with the position of the incision 12D of the zipper portion 12 when manufacturing the zippered gusset bag body 10, and it is also suitable for gusset bags 10 of various sizes. The depth of each incision 12C is not particularly limited as long as it is deep enough not to divide the linear zipper portion 12.

[0066] Furthermore, it is preferable that the chuck portion 12 melts and crushes the engaging protrusions 121, 125 together with the heat-sealing layer of the film at the position corresponding to the side joint portion 52, thereby preventing insufficient bonding strength of the side joint portion 52 at the portion sandwiching the chuck portion 12. For this reason, it is preferable that the side joint portion 52 has a partial joint portion where a strong seal is applied partially at the portion overlapping with the engaging protrusions 121, 125. Furthermore, when there are multiple rows of engaging protrusions, crushing the engaging protrusions requires a large amount of melted resin, and crushing alone may not be enough to prevent insufficient bonding strength. Therefore, at the position of the chuck portion 12 that overlaps with the side joint portion 52, the engaging protrusions 121, 125 may be removed in advance and then welded to the film.

[0067] <Manufacturing method of zippered gusset bag> Next, an example of a method for manufacturing the zippered gusset bag 10 will be described. FIG. 9 is a front view of a flat bag 10B according to this embodiment.

[0068] The gusset pouch 10 with a zipper is manufactured by deforming a flat bag 10B formed from a film with a zipper. There are two methods for manufacturing the gusset pouch 10 with a zipper: one is to manufacture the gusset pouch 10 from a pre-manufactured flat bag 10B, and the other is to manufacture the gusset pouch 10 either continuously or discontinuously after the process for manufacturing the flat bag 10B. The method for manufacturing the zippered gusset bag 10 includes (1) a zippered film forming process, (2) a flat bag forming process, (3) a flat bag expanding process, (4) a folding process, and (5) a four-corner joining section forming process. Each process will be described below.

[0069] (1) Zippered film forming process First, a long piece of material for the zipper portion 12 is joined by heat welding along the longitudinal direction of one piece of film formed in a long strip shape, to form a linear zippered film (not shown). Specifically, a single film is formed whose width dimension when viewed along the longitudinal direction is the sum of the dimensions of a pair of flat portions 2, a bottom portion 1, and two unfolded bottom joint portions 22 before joining, and a long piece of linear zipper portion 12 is welded to the vicinity of both widthwise ends of the film. At this time, it is preferable to form a cut portion 12D in advance in the long material of the zipper portion 12 at a position corresponding to the gusset-like fold line of the side portion 5 of the gusset bag body 11 and the boundary line 10L between the pair of flat portions 2 and the pair of side portions 5.

[0070] (2) Flat bag forming process A flat bag 10B that can become a gusseted bag body 10 with a zipper is formed from a single sheet of zipper film. The flat bag 10B is formed by folding a single sheet of zipper film into a W shape and then joining predetermined locations. As shown in FIG. 9, the flat bag 10B has a pair of base portions 20 that will later become a pair of flat portions 2, 2 and a pair of side portions 5, 5, a bottom gusset 21, a side joining portion 52, a bottom joining portion 22, and an inclined joining portion 55. In FIG. 9, the dashed two-dot line indicates the boundary line 10L between the flat portion 2 and the side portion 5 that will later be formed, and the symbols (2) and (5) indicate the areas that will later constitute the flat portion 2 and the side portion 5.

[0071] In the step of forming the flat bag 10B, first, a bottom gusset 21 is formed by folding a piece of zippered film into a W shape. The bottom gusset 21 of the flat bag 10B becomes the bottom portion 1 and fold-in portion 24 of the zippered gusset bag body 10. The bottom gusset 21 is folded in half so that it protrudes toward the inside of the bag. The bottom gusset 21 is formed between a pair of base portions 20 formed by folding the zippered film. The pair of base portions 20 of the flat bag 10B become the pair of flat portions 2 and the pair of side portions 5 of the zippered gusset bag body 10.

[0072] Next, the side joints 52 are formed by joining both end edges of the pair of base portions 20. The side joints 52 join the base portion 20 and the bottom gusset 21 at the positions where the bottom gussets 21 overlap. When joining the bottom gussets 21 at the positions where the bottom gussets 21 overlap, the joining can be achieved by applying a heat-sealable coating agent to the base layer of the film at least at that position and joining by welding, by using a material with a heat-sealable layer on the base layer and joining by welding, or by adhesive. Next, the boundaries between the pair of base portions 20 and the bottom gusset 21 are joined to form the bottom joints 22. Both ends of the bottom joints 22 are connected to the side joints 52. The bottom joints 22 are provided on one side and the other side of the pair of base portions 20, respectively.

[0073] 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 joins 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 located at the same position as the fold line of the bottom gusset 21 in the longitudinal direction of the side joint 52.

[0074] The side joints 52, bottom joints 22 and inclined joints 55 are formed by joining the films with zippers by welding, thereby fusing the heat-sealable layers of the films together. The order in which the side joints 52, the bottom joints 22, and the inclined joints 55 are formed is not limited to the above order. The side joints 52, the bottom joints 22, and the inclined joints 55 may be formed simultaneously.

[0075] (3) Flat bag expansion process In the flat bag expanding step, the pair of base portions 20 of the flat bag 10B are separated to expand the flat bag 10B so that the fold-in portion 24 having an isosceles triangle shape is formed along the inclined joint portion 55.

[0076] First, the pair of base portions 20 of the flat bag 10B are separated from each other and bent at the four boundary lines 10L. As a result, the pair of base portions 20 form the front portion 3, the rear portion 4, and the pair of side portions 5. Furthermore, the rectangular bottom portion 1 is formed on the side opposite the opening 9. As the pair of base portions 20 are separated from each other, an isosceles triangular fold-in portion 24 is formed along the inclined joint 55. At this stage, a gusset bag body 11 without four-corner joints 14 is formed from the flat bag 10B in an unfolded state.

[0077] (4) Folding process In the folding process, after the unfolding process, the pair of side portions 5 and the bottom surface 2 are each protruded toward the inside of the bag, and the front portion 3 and the rear portion 4 are tightly attached to each other, thereby forming a bottom gusset 21 and a side gusset 51 as shown in Figure 6, and a gusseted bag body with a zipper in a closed state is formed.

[0078] (5) Four corner joint formation process In the four-corner joint forming process, four-corner joints 14 are formed along four boundary lines 10L that define the boundaries between a pair of flat portions 2 and a pair of side portions 5 of the resealable gusset bag body, extending to below the resealable portion 12. As shown in FIG. 1 , the four-corner joints 14 extend below the lower end 12T of the resealable portion 12 in the height direction of the resealable gusset bag body. The four-corner joints 14, like other joints, are formed by welding the film of the resealable gusset bag body together, thereby fusing the heat-sealable layers of the film together. By forming the four-corner joints 14 on the resealable gusset bag body, the resealable gusset bag body 10 is completed.

[0079] The gusset bag 10 with a zipper is filled with stick-shaped contents such as instant coffee or sugar, powdered contents, granular contents, or the like to form the gusset bag package 100. The filling of the contents may be carried out as a contents filling step following the four-corner joining section forming step, or may be carried out with the gusset bag 10 with a zipper set in a separate filling machine.

[0080] According to the gusset bag 10 with a zipper of this embodiment, four-corner joints 14 are formed at the four corners of the gusset bag 11, so the folding positions of the four corners are clear even at the position of the zipper, making it easy to fold, and the fitting position of the zipper is not unclear, resulting in an excellent appearance and allowing the bag to stand stably. Furthermore, because the four-corner joints 14 are formed only below the zipper 12, a sufficiently large opening 9 can be secured when the zipper 12 is opened. Furthermore, since two side joints 52 are formed, together with the four corner joints 14, the self-supporting property can be improved.

[0081] Furthermore, with the zippered gusset bag body 10, the dimension L1 from the lower end 12T of the zipper portion 12 to the upper end of the four corner joint 14 is formed to be approximately equal to the dimension L0 from the widthwise end of the side portion to the side gusset. Therefore, when the side gusset 51 is protruded outward from the gusset bag body 11 to close the opening 9, the gusset bag package 100 containing the contents is formed into an approximately rectangular parallelepiped of the same shape as the bottom surface portion 1 in the height direction of the zippered gusset bag body 11 from the lower end to the height where the four corner joints 14 are formed, and above the four corner joints 14, an inclined portion is formed that is inclined at approximately 45° from the upper end 14T of the four corner joint 14 toward the intersection of the lower end 12T of the zipper portion 12 and the gusset-like fold line of the side portion, thereby achieving a design effect. Furthermore, as shown in Figure 2, when the side gusset 51 is protruded 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 surface, the front portion 3, the front side region 53 of the left side surface, and the rear side region 54 of the right side surface, the rear portion 4, and the rear side region 54 of the left side surface each extend in a straight line, and the two opposing zipper portions 12 can also each extend in a straight line, allowing the zipper portions 12 to be easily fitted together and the opening 9 to be reliably closed. Furthermore, as shown in Figure 3, even when the side gusset 51 is protruded toward the inside of the gusset bag body 11 and the gusset is folded to close the opening 9, it is formed into an approximately rectangular parallelepiped of the same shape as the bottom surface portion 1 from the lower end to the height where the four corner joints 14 are formed, and above the four corner joints 14, an inclined portion is formed that is inclined at approximately 45° from the upper end 14T of the four corner joints 14 toward the intersection of the lower end 12T of the zipper portion 12 and the gusset-like fold line of the side surface portion, thereby achieving a design effect. Furthermore, it is not necessary for the dimensions L1 and L0 to be approximately equal, but as long as the dimensions L1 are greater than or equal to the dimensions L0, when the side gusset 51 is protruded outward from the gusset bag body 11 to close the opening 9 as shown in Figure 2, the opening 9 is not obstructed by the four corner joints 14, and the front side region 53 of the right side portion 6, the front portion 3, the front side region 53 of the left side portion 7, and the rear side region 54 of the right side portion 6, the rear portion 4, and the rear side region 54 of the left side portion 7 can each extend in a straight line, which is preferable because the zipper portion 12 can be easily fitted and the opening 9 can be closed reliably.

[0082] 3, when the side gusset 51 is caused to protrude inward from the gusset bag 11 and the gusset is folded to close the opening 9, it is preferable that a cut portion 12D as shown in FIG. 11 is provided at least at the boundary line 10L where the gusset bag 11 is folded to correspond to the gusset bag 11 and at the position of the fold line of the side gusset 51. By providing a cut portion at this position, the gusset bag 11 can be easily folded, and the engaging protrusions 121, 125 can be engaged with each other, 121, 121 with each other, and 125, 125 with each other even in the folded portion, thereby forming a gusset bag package 100 containing contents that can close the opening 9 substantially without gaps.

[0083] Furthermore, according to the zippered gusset bag 10, the bottom gusset 21 is formed on the bottom surface portion 1, so that the internal volume can be increased and the self-standing property can be improved.

[0084] The above describes an embodiment of the present invention, but the technical scope of the present invention is not limited to the content of the above embodiment, and various changes and deletions can be made to or from each component, or the combination of each component can be changed beyond the embodiment, without departing from the spirit of the present invention.

[0085] For example, in the above embodiment, the chuck portion 12 is described as having four rows of linear engaging protrusions 121, 125, but the number of engaging protrusions 121, 125 is not limited to four, and the configuration may include three or five or more rows of engaging protrusions. Furthermore, in the above embodiment, the zipper portion 12 is described as having male engaging protrusions 121, 125 arranged opposite each other, but female engaging protrusions may also be applied, or a fastener that does not have multiple rows of engaging protrusions may be used, for example, a hook-and-loop fastener that does not have a distinction between male and female. Examples of non-gendered hook-and-loop fasteners include Kuraray Fastening's "Multilock" (consisting of hooks), Aplix's "Easylock," and 3M's "Grip Lock Strip." The zipper portion of such non-gendered hook-and-loop fasteners, consisting of hooks and hooks, is more flexible than zipper portions with multiple rows of engaging protrusions. Therefore, the zipper portion can be easily folded without providing a notch in the folding portion. Therefore, the zipper portion does not hinder the folding of the gusset bag body, and the hooks can stably engage with each other, sealing the opening with virtually no gaps. The zipper portion 12 may be arbitrarily sized as long as it can open and close the opening 9 by engaging it.

[0086] Furthermore, in the above embodiment, the zipper portion 12 is described as having a notch portion 12D formed at a position corresponding to the bending position of the gusset bag body 11, but whether or not to form the notch portion 12D at the position corresponding to the bending position can be set arbitrarily.

[0087] Furthermore, in the above embodiment, the side joint portion 52 of the side surface 5 is described as having a shape that protrudes outward. However, the side joint portion 52 may be folded down toward either the front surface region 53 or the rear surface region 54 of the side surface 5 and partially or entirely joined at either position, thereby being fixed to the front surface region 53 or the rear surface region 54. Furthermore, in the above embodiment, the side joint portion 52 is described as being formed on the side surface 5. However, whether or not the side joint portion 52 is formed on the side surface 5 may be determined arbitrarily, and a configuration without the side joint portion 52 may also be used. Furthermore, in the above embodiment, the bottom surface 1 is described as being included, but a configuration without the bottom surface 1 may also be used. For example, as shown in Figures 10(A) and 10(B), the tubular portion may be a tubular portion with a rectangular cross section, in which a spine bonding portion 42, in which the ends of a single film are connected, is provided on one of the flat portions, without providing a side joint portion. Furthermore, as shown in FIGS. 10(A) and 10(B), the bag may be a gusset bag with a zipper, in which the bottom is formed by folding the flat portion, without providing a bottom portion.

[0088] In addition, in the above embodiment, the case where the side portion 5 is connected to the bottom portion 1 via the fold-in portion 24 is described, but whether or not the side portion 5 is connected to the bottom portion 1 via the fold-in portion 24 can be set arbitrarily, and the side portion 5 may be connected to the bottom portion 1 without via the fold-in portion 24.

[0089] Alternatively, the side joint portion 52 may be folded down onto the side portion 5 and joined and fixed to the side portion 5 at least in part.

[0090] Furthermore, in the above embodiment, the four-corner joints 14 are formed only in the range below the lower end 12T of the chuck portion 12 (toward the bottom surface portion 1), i.e., the case where only the so-called lower four-corner joints are provided has been described. However, as shown in Fig. 12, upper four-corner joints 15 that do not overlap with the chuck portion 12 may be formed in the range above the upper end of the chuck portion 12. In this case, by providing the four-corner joints 14, 15 above and below the chuck portion 12 at the four corners, the folding positions at the four corners are clearer, the chuck portion 12 is easier to fold, the fitting position of the chuck portion 12 is not unclear, the product has an excellent appearance, and can stand on its own stably. In addition, compared to the zippered gusset bag body 10 of the above embodiment, the area of ​​the opening 9 is smaller by the amount of the upper four corner joints 15, but since the upper four corner joints 15 are formed up to the vicinity of the opening 9, the self-standing ability is further improved. Furthermore, the upper four-corner joints 15 in the range above the upper end of the chuck portion 12 are preferably equal to or smaller than the width of the four-corner joints 14 in the range below the lower end of the chuck portion 12. By making the width as narrow as possible or gradually narrowing toward the opening 9, the folding position becomes clear, the fold becomes easier, and the opening 9 can be made wider while improving self-standing. However, if the four-corner joints 14 are formed continuously from top to bottom so as to overlap with the chuck portion 12, the chuck portion 12 will melt at the position where the four-corner joints 14 and the chuck portion overlap. When the chuck portion 12 of this embodiment has multiple rows of engaging protrusions 121, 125, the amount of melted resin increases, and molten resin lumps may form inside the four-corner joints 14, hindering the sealing of the chuck portion 12. Therefore, it is preferable that the four corner joints 14 are formed below the chuck portion 12 without overlapping with the chuck portion 12, and that the upper four corner joints 15 are formed above the chuck portion 12.

[0091] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments may be combined as appropriate. [Explanation of symbols]

[0092] 1 Bottom part 1A Long side (first opposite side) 1B Short side (second opposite side) 2 Plane part 3 Front part 4 Rear part 5 Side part 6 Right side part 7 Left side part 8 Cylindrical part 9 Opening 10 Gusseted bag with zipper 10B flat bag 10L border 11 Gusset bag body 12 Chuck part 12C cut 12D notch 14 Four corner joints 15 Upper four corner joints 20 Base 21 Bottom gusset 22 Bottom joint 24 Fold-in section 51 Side gusset 52 Side joint 53 Front side area 54 Posterior side area 55 Inclined joint 100 Gusset bag packaging

Claims

1. A gusseted bag with a zipper, a pair of planar portions consisting of a front portion and a rear portion; a pair of side portions connecting the front portion and the rear portion to form a tubular portion having a rectangular cross section and a gusset-like fold; an opening formed at one end of the cylindrical portion; four-corner joints formed at four corners of the tubular portion located at both widthwise ends of the pair of flat portions and both widthwise ends of the pair of side portions; a gusseted bag body having a linear chuck portion formed in a circumferential direction of the cylindrical portion below the opening; Equipped with The four corner joints are formed in a range below the chuck portion. A gusseted bag with a zipper.

2. The zippered gusset bag according to claim 1, The dimension L1 from the lower end of the zipper portion to the upper end of the four corner joint is formed to be approximately equal to the dimension L0 from the width direction end of the side surface portion to the gusset-like folding line. A gusseted bag with a zipper.

3. The zippered gusset bag according to claim 1, When the dimension from the lower end of the zipper portion to the upper end of the four corner joint is L1 and the dimension from the width direction end of the side portion to the gusset-like fold line is L0, Dimension L1≧Dimension L0 A gusseted bag with a zipper.

4. The zippered gusset bag according to any one of claims 1 to 3, The side surface portion has A side joint portion is provided at the center of the width of the side surface portion, joining the front surface portion side region and the rear surface portion side region along the up-down direction. A gusseted bag with a zipper.

5. The zippered gusset bag according to any one of claims 1 to 4, The zipper portion has a notch at a position corresponding to the folding position of the gusset bag body. A gusseted bag with a zipper.

6. The zippered gusset bag according to any one of claims 1 to 5, The device further includes upper four-corner joints formed in a range above the chuck portion and not overlapping with the chuck portion. A gusseted bag with a zipper.

7. The zippered gusset bag according to any one of claims 1 to 6, A rectangular bottom surface portion is provided at the other end of the cylindrical portion. A gusseted bag with a zipper.

8. The zippered gusset bag according to any one of claims 1 to 7, The chuck portion has an engaging protrusion portion consisting of a plurality of rows of protrusions, The engaging protrusion has the same shape over the entire circumference of the cylindrical portion. A gusseted bag with a zipper.

9. The zippered gusset bag according to any one of claims 1 to 7, The zipper portion is a hook-and-loop fastener that can be either male or female. A gusseted bag with a zipper.

10. A gusset bag package comprising the zippered gusset bag according to any one of claims 1 to 9, and contents housed therein.

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