JP6226735B2 - Square bottom bag - Google Patents

Description

  The present invention relates to a square bottom bag for packaging an article to be packaged such as daily necessities and food.

  DESCRIPTION OF RELATED ART Conventionally, there exists a thing of patent document 1, 2 as a package for packaging daily necessities, foodstuffs, etc.

  The package described in Patent Document 1 has a rectangular body portion and a rectangular bottom portion formed of a raw film, and the rectangular body portion has a gusset portion that can be folded inward with a cylindrical side surface portion made of a film. At the same time, the square bottom portion is formed by closing the cylindrical lower portion obtained by extending the film of the square body portion downward.

  At this time, in the package described in Patent Document 1, a crease is formed between the square body portion and the square bottom portion and for forming a sharp right-angled corner portion around the square bottom portion. This crease enhances the shape retention of the square bottom bag and attempts to ensure the independence even when a lightweight product is packaged.

  The packaging body described in Patent Document 2 is a gusset-type packaging body having gusset portions on the upper and lower surfaces and sealing portions on the left and right sides, and is capable of self-supporting on the flat surface of the lower surface gusset portion.

JP 2006-75987 A Japanese Utility Model Publication No. 63-169469

  Conventionally, in a square bag having a square body part and a square bottom part, when forming the square bottom part by closing the cylindrical lower part obtained by extending the film of the square body part downward, each bottom part of the opposite film in the cylindrical lower part is formed. The back edges of the edge portions are joined to each other, and the joining portions of these films project outward as bottom joining pieces in the bottom surface of the square bottom portion.

  In the case of a square bottom bag in which a protruding bottom joint piece is provided on the bottom surface of such a square bottom portion, it is assumed that the structure described in Patent Document 1 that gives a clear crease around the corner bottom portion is adopted. However, the sticking out of the bottom surface of the strong bottom joint piece that protrudes from the bottom surface of the corner bottom part greatly disturbs the flatness of the bottom surface of the corner bottom part, impairs the seating property of the corner bottom part, and thus the independence of the corner bottom bag. Hurt.

  In addition, in the package of patent document 2, it consists of a joining piece which the back surface edge of each side edge part of the film which the right and left sealing part comprises the trunk | drum of a package body, and opposes joined. Hangs outward. And the outline of the protruding outer edge part of the joining piece which becomes this right and left sealing part is made into the jagged shape. However, the jagged outer edge portion of the sealing portion is a cut that improves the design effect, and has nothing to do with the seating property and the self-supporting property of the package.

  The subject of this invention is improving the seating property of a square bottom part and improving self-supporting property in the square bottom bag which provides an overhanging bottom joined piece in the bottom face of a square bottom part.

The invention according to claim 1 is formed of a soft packaging material having flexibility and flexibility, and has a rectangular tube shape formed by a front portion, a back portion, and side portions on both sides, and each of the side portions on both sides is a front surface. It has a square body with a gusset part that can be folded inwardly at a valley fold part provided in the middle of two mountain fold parts provided at the boundary between the head part and the back part, and forms a square body part The lower part of the square body part is closed by the front and rear extension parts extended from the lower end parts of the front part and the rear part and the side extension parts extended from the lower end parts of the side parts forming the square body part. A bottom joining piece having a corner bottom portion, the corner bottom portion being joined to the back end edges of the lower edge portions of at least two of the front extension portion, the rear extension portion, and the side extension portion and projecting outward. A square bottom bag having a plurality of concave notches on its protruding outer edge. Comprising a part, in which was set to a non-bonding portion to the distal end of the overhang-like outer edge.

The invention according to claim 2 is formed of a soft packaging material having flexibility and flexibility, and has a rectangular tube shape formed by a front portion, a back portion, and side portions on both sides, and each of the side portions on both sides is a front surface. It has a square body with a gusset part that can be folded inwardly at a valley fold part provided in the middle of two mountain fold parts provided at the boundary between the head part and the back part, and forms a square body part A front extension and a back extension extended in an inverted trapezoidal shape from each lower end of the front and back parts, and a side extended from the lower end of each side part forming a rectangular body into a V-shaped tongue A center that has a square bottom that closes the lower part of the square torso by an extension, and the bottom of the square is an inverted trapezoidal front extension and the back edge of each lower edge of the rear extension is joined to the center Each of the bottom joint piece, the back edge of each side edge of the V-shaped tongue-shaped side extension, and the inverted trapezoidal shape A square bag comprising: an extension portion; and a double-sided bottom joint piece projecting outwardly by joining each of the back edge of each oblique side edge portion following the center bottom joint piece portion of the back extension portion. The center bottom joining piece is provided with a plurality of dents on the projecting outer edge, and has a non-joining part at the tip of the projecting outer edge .

At the corner bottom bag formed by providing the bottom joining piece in the corner bottom, with the bottom joining piece a recess-like defects in the overhanging shape outer edge, by Rukoto which have a non-bonding portion to the distal end of the protruding shaped outer edge , Lower the strength of the waist of the bottom joint piece that protrudes from the bottom of the bottom of the corner, improve the seating of the bottom of the corner, and improve the independence.

FIG. 1 shows a state in which a gusset portion of a square bottom bag of Embodiment 1 is folded, (A) is a perspective view showing an example of a bottom joint piece, and (B) is a perspective view showing another example of a bottom joint piece. is there. FIG. 2 shows a square bottom bag, (A) is a perspective view showing an unsealed state, and (B) is a perspective view showing a sealed state. FIG. 3 shows a square bottom bag according to the second embodiment, (A) is a perspective view showing an unsealed state, and (B) is a perspective view showing a sealed state. FIG. 4: shows the square bottom bag of Embodiment 3, (A) is a perspective view which shows an unsealed state, (B) is a perspective view which shows a sealed state. FIG. 5: shows the square bottom bag of Embodiment 4, (A) is a perspective view which shows an unsealed state, (B) is a perspective view which shows a sealed state. FIG. 6 is a schematic view showing an example of a recessed defect portion provided in an overhanging outer edge portion of the bottom joint piece.

  The present invention will be described below based on preferred embodiments with reference to the drawings.

(Embodiment 1) (FIGS. 1, 2, and 6)
FIG. 1 shows a square bottom bag 1 before use, and FIG. 2 shows a square bottom bag 1 that is opened to be filled with an article to be packaged. The square bottom bag 1 has a square body portion 10 and a square bottom portion 20 and is composed of a soft packaging material having flexibility and flexibility.

  The soft packaging material having flexibility and flexibility is not particularly limited, and examples thereof include a synthetic resin sheet, a laminate sheet of thin paper and a synthetic resin, and a laminate sheet obtained by laminating synthetic resins. A synthetic resin laminate sheet is preferred.

  For example, on the sheet surface (outer bag side) of the square bottom bag 1, a paperboard such as coated cardboard or kraft paper, a polyolefin resin such as polyethylene terephthalate, polypropylene or polyethylene, or a blend of polyethylene terephthalate resin mainly composed of polyethylene A heat-melt adhesive polyolefin resin such as a resin can be used.

  On the other hand, a hot melt adhesive polyolefin resin layer (sealant layer) such as polyethylene, polypropylene, and a blend resin mainly composed of polyethylene is laminated on the sheet rear surface (bag inner surface side) of the square bottom bag 1.

  In addition, an intermediate layer between the outermost layer and the innermost layer of the square bottom bag of the present invention includes an aluminum foil layer (gas barrier layer), an aluminum foil layer (gas barrier layer) / polyethylene terephthalate resin layer, an aluminum vapor deposition layer (if necessary) Gas barrier layers such as (gas barrier layer) / polyethylene terephthalate resin layer and inorganic oxide vapor deposition layer (gas barrier layer) / polyethylene terephthalate resin layer such as silicon oxide and magnesium oxide are laminated.

  The rectangular body 10 is formed by a front part 11, a rear part 12, and side parts 13 and 14 on both sides, and is a rear end of the rear part 12 located at one end of a single flat sheet (or a tube-like sheet). One column joint part 15 is provided in which the edge and the back surface edge of the side face part 14 located at the other end part are joined by thermal fusion of those heat seal layers.

  In the present embodiment, a surface mainly facing the user at the time of product display is referred to as a front portion 11, and the opposite surface is referred to as a back portion 12. However, in the present invention, “front part” and “back part” are described for convenience, and the back part 12 in this embodiment is rephrased as “front part”, and the front part 11 is rephrased as “rear part”. May be.

  The square body portion 10 includes two side portions 13 and 14 that are provided along the vertical direction (the vertical direction in which the square bottom bag 1 is self-supporting) with the side portions 13 and 14 on both sides positioned at the boundary between the front portion 11 and the rear portion 12. The middle of the mountain folds 16A, 16A and the lateral direction (the direction along the horizontal plane of the table surface or the like on which the square bottom bag 1 is seated) sandwiched between the mountain folds 16A, 16A inside the side surface parts 13, 14 on both sides And one valley fold 16B provided along the vertical direction. And the trough fold part 16B provided in the side parts 13 and 14 of both sides is provided with the gusset part 16 which can be folded inward of the square bottom bag 1. FIG. In the present embodiment, the valley fold 16B is located in the middle in the lateral direction between the mountain folds 16A and 16A inside the side surfaces 13 and 14 on both sides, but the valley fold 16B It does not necessarily need to be in the middle of the middle.

  The square bottom portion 20 includes a front extension portion 21 and a rear extension portion 22 that are extended in a reverse trapezoidal shape that protrudes downward from the lower end portions of the front portion 11 and the rear portion 12 that form the square body portion 10, The lower portion of the rectangular body 10 is closed by side extension parts 23 and 24 extended in a V-shaped tongue shape projecting downward from the lower ends of the side parts 13 and 14 forming the body part 10.

  Here, as shown in FIGS. 1 and 2, the bottom portion 20 is provided with a center bottom joint piece 25 and both side bottom joint pieces 26 for closing the lower portion of the square body portion 10.

  The center bottom joining piece 25 is provided by joining the back edges of the lower edge portions of the inverted trapezoidal front extension 21 and back extension 22 by heat-sealing of their heat seal layers. Overhang outside of 1.

  The both side bottom joint pieces 26 are respectively the rear end edges of the side edge portions of the side surface extensions 23 and 24 each having a V-shaped tongue shape, and the center bottom joints of the inverted trapezoidal front extension portion 21 and the back surface extension portion 22. Each of the back edge of each oblique side edge part following the part that has become the piece 25 is provided by being bonded by thermal fusion of those heat seal layers, and protrudes outward from the square bag 1.

  However, in the square bag 1, each of the central bottom joint piece 25 and the both side bottom joint pieces 26 provided on the square bottom portion 20 has a plurality of contours 31 on the projecting outer edge portion 30 as shown in FIG. This is provided with a recessed defect portion 31A. In this embodiment, the outline 31 of the overhanging outer edge portion 30 is an uneven shape in which triangular peaks are continuous, and a valley sandwiched between adjacent peak-shaped skirts is defined as a recessed defect portion 31A.

  As shown in FIG. 1, the center bottom joining piece 25 and the both side bottom joining pieces 26 are bonded to only the triangular chevron forming the concavo-convex contour 31 of the overhanging outer edge 30 as described above. Instead of forming a joint, a heat-sealed joint that is continuous in the width direction from the contour 31 to the square body 10 is formed.

Hereinafter, an example of the manufacturing method of the square bottom bag 1 is demonstrated.
(1) A long flat sheet is formed into a cylindrical shape in which the back edge of one end and the back edge of the other end are heat-sealed (the heat-sealing part becomes the column joint 15). . In this cylindrical sheet, the surface on which the column joint portion 15 is located is the back surface portion 12, the opposite surface of the back surface portion 12 is the front surface portion 11, and the portions that form the side surface portions 13 and 14 on both sides are the gusset portions 16. Fold it down.

  (2) In the cylindrical sheet of (1) described above, the center bottom joining piece 25 and the both side bottom joining pieces 26 for closing the lower portion of the portion that becomes the square body portion 10 to form the corner bottom portion 20 are heat-sealed. .

  (3) Cut a portion corresponding to the recessed defect portion 31A so as to form a recessed defect portion 31A in the overhanging outer edge portion 30 of the center bottom joint piece 25 and the both side bottom joint pieces 26 of (2) above. , Each one square bottom bag 1 is cut off. Examples of the cutting device include a roll cutter (a pair of a roll having a blade formed in the shape of the recess 31A and a roll having no blade opposed to each other), a laser cutter, and the like.

  It should be noted that the above-described (2) and (3) may be performed after the cylindrical sheet of (1) is cut into the length of one square bottom bag 1.

  As described above, when the inside of the square bottom bag 1 is expanded in order to load the package, the side surface portions 13 and 14 on both sides of the square body portion 10 are developed in a planar shape by the outward bulge of the gusset portion 16, The trunk portion 10 has a rectangular tube shape defined by the front portion 11, the back portion 12, and the side portions 13 and 14 on both sides. And the four rounds of the bottom face of the square bottom part 20 which continues to the lower end part of the front face part 11 and the back face part 12 and the side face parts 13 and 14 on both sides of the square body part 10 bulge outward. It approaches a quadrangular shape, and the bottom surface of the square bottom portion 20 becomes flat (FIG. 2).

  At this time, in the square bottom bag 1, the presence of the concave defect portion 31 </ b> A included in the contour 31 of the protruding outer edge portion 30 of the central bottom joint piece 25 and the both side bottom joint pieces 26 provided on the square bottom portion 20. Accordingly, the strength of the bottom joint pieces 25 and 26 protruding from the bottom surface of the corner bottom portion 20 is reduced, and the corner bottom portion 20 is seated on a shelf (store shelf, house storage shelf, etc.) or table surface. In this case, the projecting portions of the bottom joint pieces 25 and 26 are not easily bent and stretched, in other words, the flatness of the bottom surface of the corner bottom portion 20 is not disturbed, and the seating property of the corner bottom portion 20 is improved. As a result, the independence of the square bag 1 can be improved. Even when a lightweight product is packaged, self-supporting property can be ensured, the entire shape including the rectangular body 10 can be maintained, the fall can be prevented, and the transportability at the distribution stage and the display property at the store can be improved.

  Further, in the square bottom bag 1 before use, as shown in FIG. 1A, the gusset portion 16 of the square body portion 10 is folded inward of the square bottom bag 1, and the front portion 11 and the front extension portion are provided. In the state where 21 is superimposed on each of the back surface portion 12 and the back surface extension portion 22, an angle α formed by the both side bottom joint pieces 26 constituting the square bottom portion 20 with respect to the outward extension line of the center bottom joint piece 25 is set. It is preferably within the range of 25 to 50 degrees, more preferably 45 degrees. That is, if the angle formed by the both side bottom joint pieces 26 with respect to the center bottom joint piece 25 in the square bottom portion 20 is in the range of 25 degrees to 50 degrees, the bottom surface of the square bottom portion 20 caused by the above-described contents charging is included. Flattening becomes remarkable, and the seating property of the corner bottom part 20 and the self-supporting property of the corner bottom bag 1 can be secured.

  Moreover, in the square bottom bag 1, the back surface edge of the back surface part 12 located in the one end part of the flat sheet which comprises the square body part 10, and the back surface edge of the side part 14 located in the other end part are included. One column joint portion 15 is provided. In the form of FIG. 1 and FIG. 2, the column joint 15 is located at the corner of the corner bottom 20, and the corner bottom 20 does not have a joint extending from the column joint 15. The single column joint 15 provided in the square body 10 stabilizes the standing property of the square body 10 and improves the self-supporting property of the square bag 1. Furthermore, in the form of FIGS. 1 and 2, the flatness of the bottom surface of the corner bottom 20 is further maintained by the position of the column joint portion 15 being at the corner of the corner bottom 20 (not in the corner bottom 20). And the independence of the square bottom bag 1 is improved.

  6A to 6G can be adopted as the form of the contour 31 of the overhanging outer edge portion 30 in the center bottom joining piece 25 and the both side bottom joining pieces 26 in the square bottom bag 1.

  6 (A) to 6 (E), all of the base portion to the tip portion of the overhanging outer edge portion 30 are joined by thermal fusion. The contour 31 of the overhanging outer edge portion 30 shown in FIG. 6A is an uneven shape in which the triangular chevron described above is continuous, and a portion sandwiched between the ridges of adjacent chevron shapes is a concave defect portion 31A. It is what. The shape of the recessed defect portion 31 </ b> A is a shape in which a triangular mountain shape is directed toward the base of the overhanging outer edge portion 30. The contour 31 of the overhanging outer edge portion 30 shown in FIG. 6B is an uneven shape in which trapezoidal chevron shapes are continuous, and an uneven shape in which chevron shapes obtained by cutting and removing the tops of the triangles are continuous. A portion sandwiched between adjacent mountain-shaped skirts is defined as a recessed defect portion 31A. The shape of the recessed defect portion 31 </ b> A is a shape in which a triangular mountain shape is directed toward the base of the overhanging outer edge portion 30. The contour 31 of the protruding outer edge portion 30 shown in FIG. 6C is an uneven shape in which arc-shaped chevron forming a convex surface toward the outside is continuous, and the portion sandwiched between adjacent chevron skirts is recessed. It is assumed as a shape defect portion 31A. The shape of the recessed defect portion 31 </ b> A is a shape in which an arc-shaped chevron that forms a concave surface toward the base portion of the protruding outer edge portion 30 faces the base portion of the protruding outer edge portion 30. The contour 31 of the protruding outer edge portion 30 shown in FIG. 6D is an uneven shape in which arc-shaped chevron that forms a concave surface toward the outside is continuous, and a portion sandwiched between adjacent chevron ridges is recessed. It is assumed as a shape defect portion 31A. The shape of the recessed defect portion 31 </ b> A is a shape in which an arc-shaped chevron that forms a convex surface toward the base portion of the overhanging outer edge portion 30 faces the base portion of the overhanging outer edge portion 30. The contour 31 of the protruding outer edge portion 30 shown in FIG. 6 (E) is an uneven shape in which an arc-shaped mountain shape that forms a convex surface outward and an arc-shaped valley shape that forms a concave surface outward are continuous. There is a recessed valley 31 </ b> A between adjacent mountain valleys. The shape of the recessed defect portion 31 </ b> A is a shape in which an arc-shaped chevron that forms a convex surface toward the base portion of the overhanging outer edge portion 30 faces the base portion of the overhanging outer edge portion 30.

  6 (F) and 6 (G) show that only a part of the joining portion A including the base portion of the overhanging outer edge portion 30 is joined by thermal fusion, and the tip portion of the overhanging outer edge portion 30 is set as a non-joining portion B. It is. FIG. 6 (F) shows the contour 31 of the overhanging outer edge portion 30 as a concavo-convex shape in which triangular peaks similar to those in FIG. 6 (A) are continuous. Only the lower half part of the outline 31 is a joined part A joined by thermal fusion. FIG. 6 (G) shows the contour 31 of the overhanging outer edge portion 30 as an irregular shape with continuous triangular peaks similar to FIG. 6 (A), but only the base of the overhanging outer edge portion 30 is heated. The joining portion A is joined by fusion bonding.

  Moreover, in the square bottom bag 1, as the outline 31 of the overhang | projection-shaped outer edge part 30 in the center bottom joining piece 25 and the both-sides bottom joining piece 26, various mountain shapes of FIG. 6 (A)-(G) are arranged in order. It is also possible to mix these mountain shapes.

  Further, in the square bottom bag 1, a recessed defect portion 31 </ b> A is provided only on the protruding outer edge portion 30 of the center bottom bonding piece 25, and a recessed defect portion 31 </ b> A is formed on the protruding outer edge portion 30 of the both side bottom bonding pieces 26. It is also possible not to provide.

  Further, in the square bottom bag 1, as shown in FIG. 1B, the center bottom joint piece 25 is provided with a recessed defect portion 31 </ b> A in the entire region 31 of the overhanging outer edge portion 30, and both side bottom joint pieces 26. Then, it is also possible to provide the recessed defect portion 31 </ b> A partially only in a partial range of the outline 31 of the protruding outer edge portion 30. Specifically, in FIG. 1 (B), a concave-shaped defect portion 31A is provided in the overhanging outer edge portion 30 adjacent to the center bottom joint piece 25 of the both side bottom joint pieces 26, and both side bottom joints adjacent to the square body portion 10 are provided. The projecting outer edge 30 of the piece 26 is not provided with a recessed defect 31A. As described above, when the protruding outer edge portion 30 of the both-side bottom joint piece 26 adjacent to the square body portion 10 is not provided with the recessed defect portion 31A, the square bottom portion 20 is filled when the article to be packaged with a large volume is filled. In particular, it is effective when there is a column joint portion 15 formed by joining the back surface portion 12 and the side surface portion 14 together.

Moreover, in the square bottom bag 1, the following iv can be employ | adopted suitably.
i. The thickness of the sheet constituting the square bottom bag 1 is 10 μm to 100 μm.

  ii. The length of the long side of the square base 20 (the lateral length of the front surface 11 and the back surface 12 of the rectangular body 10) is 0.5 to 2.5 times the vertical length of the rectangular body 10. And

  iii. The length of the long side of the square bottom portion 20 (the lateral length of the front surface portion 11 and the back surface portion 12 of the square body portion 10) is the length of the short side of the square bottom portion 20 (the lateral direction of the side surface portions 13 and 14). 1 to 3 times the (length).

  iv. The total area of the rectangular outer edge portion 30 in which the notch-shaped defect portion 31A is not formed by cutting out the notch area of the recess-shaped defect portion 31A cut out from the rectangular protruding outer edge portion 30 of the center bottom joint piece 25. 30 to 70%, more preferably 40 to 60%.

  v. The notch area of the recessed defect portion 31A cut out from the rectangular protruding outer edge portion 30 of the bottom joint piece 26 on both sides is the total area of the rectangular outer edge portion 30 where the recessed defect portion 31A is not formed. 20 to 70%, more preferably 30 to 60%.

(Embodiment 2) (FIG. 3)
The difference between the bottom bag 1 of the second embodiment and that of the first embodiment is that the back edges of the back surface portions 12A and 12B folded at both ends of the flat sheet constituting the rectangular body portion 10 are joined. A single column joint (back pasting portion) 17 is provided. The column joint portion 17 is formed in the middle of the back surface portion 12 in the width direction, and is extended to the square bottom portion 20. According to the square bottom bag 1 of FIG. 3, the standing property of the square body portion 10 is stabilized by the single column joint portion 17 provided in the square body portion 10, and the self-supporting property of the square bottom bag 1 is improved. Moreover, by making the column | joint junction part 17 into the square body part 10 formed in the width direction intermediate part of the back surface part 12, it can manufacture easily compared with the square bottom bag 1 of FIG.

(Embodiment 3) (FIG. 4)
The difference between the square bottom bag 1 of the third embodiment and that of the first embodiment is that the front and rear surfaces 11 and 12 and the side surfaces 13 and 14 on both sides that form the square body 10 are joined to each other at the back edges. The four column joint portions 18A to 18D are provided. That is, the four column joint portions 18A to 18D included in the square body portion 10 stabilize the standing property of the square body portion 10 and further improve the self-supporting property of the square bottom bag 1.

(Embodiment 4) (FIG. 5)
The square bottom bag 1 according to the fourth embodiment is obtained by adding the column joint portion (back bonding portion) 17 in the square bottom bag 1 according to the second embodiment to the square bottom bag 1 according to the third embodiment.

  The square bottom bag 1 puts an article to be packaged from the upper end opening of the square body portion 10, and the upper end opening is sealed to become a packaged product. Examples of the items to be packaged include cosmetics, cleaning sheets, daily necessities such as chemicals, and foods such as confectionery and laver.

  As mentioned above, although this invention was shown and demonstrated the preferable embodiment, this invention can be variously changed without being restrict | limited to said embodiment. The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

  For example, the surface on which the column joint is in contact or formed is used as the back for convenience, but this may be used as the front.

  ADVANTAGE OF THE INVENTION According to this invention, the seating property of a square bottom part can be improved and the self-supporting property can be improved in the square bottom bag which provides a protruding bottom joined piece in the bottom face of a square bottom part.

DESCRIPTION OF SYMBOLS 1 Square bottom bag 10 Square body part 11 Front part 12, 12A, 12B Rear part 13, 14 Side part 15, 17, 18A-18D Column joint part 16 Gusset part 16A Mountain fold part 16B Valley fold part 20 Square bottom part 21 Front extension Portion 22 Back extension 23, 24 Side extension 25 Center bottom joint piece 26 Both side bottom joint piece 30 Overhanging outer edge 31 Contour 31A Concave defect
A joint
B Non-joined part

Claims (8)

It is made of soft packaging material with flexibility and flexibility, and has a rectangular tube shape formed by the front part, the back part, and the side parts on both sides, and each side part on both sides is at the boundary between the front part and the back part. While having a square body portion with a gusset portion that allows a valley fold portion provided in the middle of two provided mountain fold portions to be folded inward,
A square body is formed by a front extension part and a rear extension part extended from the lower end parts of the front part and the rear part forming the square body part, and a side extension part extended from the lower end part of each side part forming the square body part. Having a square bottom that closes the bottom of the part,
A square base having a bottom joint piece in which the bottom edges of the bottom edges of the at least two extensions of the front extension, the back extension, and the side extension are joined to each other and project outward. A bag,
A square-bottom bag in which a bottom joining piece has a plurality of dents on a protruding outer edge portion, and has a non-joining portion at a tip portion of the protruding outer edge portion . It is made of soft packaging material with flexibility and flexibility, and has a rectangular tube shape formed by the front part, the back part, and the side parts on both sides, and each side part on both sides is at the boundary between the front part and the back part. While having a square body portion with a gusset portion that allows a valley fold portion provided in the middle of two provided mountain fold portions to be folded inward,
Front extension and back extension extended from the lower end of each of the front and back parts forming a rectangular body to an inverted trapezoidal shape, and a V-shaped tongue from the lower end of each side part forming the rectangular body It has a square bottom that closes the lower part of the square torso by a side extension extended to
A center bottom joint piece that protrudes outwardly by joining the back edges of the lower edges of the front extension and the back extension with an inverted trapezoidal shape, and both sides of the V-shaped tongue-like side extension Each of the back edge of the edge, the inverted trapezoidal front extension, and the back edge of each oblique side edge following the portion that became the center bottom joint piece in the back extension is joined outward. A square bottom bag provided with both side bottom joint pieces projecting to
A square-bottom bag in which a central bottom joining piece has a plurality of dents on a protruding outer edge portion and has a non-joining portion at the tip of the protruding outer edge portion .   The square-bottom bag according to claim 2, wherein the both-side bottom joint pieces are provided with a plurality of recessed deficient portions at their projecting outer edge portions.   The gusset part of the square body part is folded, and the both side bottom joint pieces constituting the corner bottom part are outward of the center bottom joint piece in a state where the front part and the front extension part are overlapped with each of the back part and the back extension part. The square bottom bag according to claim 2 or 3, wherein an angle formed with respect to the extended line is set in a range of 25 degrees to 50 degrees.   One column joint part using one sheet as the soft wrapping material, and joining the back surface edge of the back surface part located at one end of the sheet and the back surface edge of the side part located at the other end part The square bottom bag according to any one of claims 1 to 4, wherein a lower end of the column joint portion is located at a corner of the square bottom portion.   A single sheet is used as the soft wrapping material, and includes a single column bonding portion in which the back surface edges of the back surface portion folded at both ends are bonded to both ends of the sheet. The square bottom bag according to any one of claims 1 to 4, which is located in the box.   A sheet is used as the soft wrapping material, and includes four column joint portions in which the back surface edges adjacent to each other of the front surface portion, the back surface portion, and the side surface portions on both sides are formed. The square bottom bag according to any one of 4 above.   A packaged product in which an article to be packaged is placed in the square bottom bag according to claim 1 and sealed.

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