Packaging bag

Abstract

To secure usability of a packaging bag.SOLUTION: An envelope-type packaging bag 1 having no gusset includes: a first bottom folding line 10 extending along a horizontal direction at the center of a main surface part 2 in the horizontal direction; a second bottom folding line 20 having a second left bottom folding line 21 positioned on a leftward extension line of the first bottom folding line 10 and a second right bottom folding line 22 positioned on a rightward extension line of the first bottom folding line 10; a third bottom folding line 30 having a third left bottom folding line 31 connecting a connection part 12L between the first bottom folding line 10 and the second left bottom folding line 21 and a lower end 3LD of a left return line 3L and a third right bottom folding line 32 connecting a connection part 12R between the first bottom folding line 10 and the second right bottom folding line 22 and a lower end 3RD of a right return line 3R; and a side folding line 50 having a left folding line 5L extending upward from the connection part 12L and a right folding line 5R extending upward from the connection part 12R. The side folding line 50 is arranged such that the left side folding line 5L and the right side folding line 5R are separated in the horizontal direction as they extend upward.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an envelope-type packaging bag without a gusset. [Background technology]

[0002] BACKGROUND ART Envelopes without gussets that can accommodate flat contents are known, and gusseted envelopes that can accommodate three-dimensional contents are also known. Gusseted envelopes are pre-folded to create a gusset between the front and back sides. When a gusseted envelope is unused, it has a mountain fold line on the front side, a mountain fold line on the back side, and a valley fold line between these two mountain fold lines, and these three fold lines are folded in on the left and right sides. By folding in these three fold lines, not only are the front and back sides overlapped, but also a total of four sides are overlapped: the planar area between the mountain fold line and the valley fold line on the front side (the front half of the gusset) and the planar area between the mountain fold line and the valley fold line on the back side (the back half of the gusset).

[0003] In contrast to the gusseted envelopes that are folded over on six fold lines on the left and right sides as described above, the front and back sides of the envelope without a gusset are folded over on a pair of mountain fold lines on the left and right sides, whether the envelope is unused or in a used state, and only the front and back sides, which are folded over on two fold lines on the left and right sides, are overlapped. Therefore, although a gusseted envelope can accommodate more three-dimensional contents than an envelope without a gusset, an envelope without a gusset is less bulky than an envelope with a gusset. In relation to this, a gusseted packaging bag has been proposed, which has a bottom surface that extends in the same area as the opening when viewed from above (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Microfilm of Utility Model Application No. 59-58570 (Utility Model Application No. 60-121842) Summary of the Invention [Problem to be solved by the invention]

[0005] However, as described above, a gusseted packaging bag having a bottom surface extending in the same area as the opening when viewed from above can be said to be in a state where the opening is open to the same size as the bottom surface, which may cause the contents contained in the packaging bag to spill out or foreign objects to enter the packaging bag from the outside. For users of packaging bags that have the risk of contents spilling out or foreign objects getting inside, it is difficult to carry the bag with the contents inside or to prevent foreign objects from getting inside, which may result in insufficient usability of the packaging bag. Therefore, there is room for improvement in ensuring the usability of packaging bags.

[0006] The present invention was conceived in consideration of the above-mentioned problems, and one of its objectives is to ensure the usability of gusset-less envelope-type packaging bags. However, other objectives of the present invention are not limited to this objective. The functions and effects derived from the respective configurations shown in the "Mode for Carrying Out the Invention" described below, which cannot be obtained with conventional technologies, can also be considered as other objectives of the present invention. [Means for solving the problem]

[0007] The packaging bag disclosed herein has the following features (1) to (7). (1) A gussetless envelope-type packaging bag, in which a pair of main surface portions, each composed of a first surface portion whose upper edge is located on one side of an opening and a second surface portion whose upper edge is located on the other side of the opening, are connected by only three fold lines: a bottom fold line which is a fold line located at the lower edge of the main surface portions and extending along the left-right direction; a pair of side fold lines which are a left fold line which is a fold line extending along the up-down direction on the left edge of the main surface portions; and a right fold line which is a fold line extending along the up-down direction on the right edge of the main surface portions, A first bottom fold line extending along the left-right direction at the left-right center of the main surface portion; A second left bottom fold line is located on an extension line extending leftward from the first bottom fold line, and a second right bottom fold line is located on an extension line extending rightward from the first bottom fold line, and a pair of second bottom fold lines extending on the main surface portion; A third left bottom fold line connecting the left connection point, which is the connection point between the first bottom fold line and the second left bottom fold line, and the lower end of the left fold line, and a third right bottom fold line connecting the right connection point, which is the connection point between the first bottom fold line and the second right bottom fold line, and the lower end of the right fold line, and a pair of third bottom fold lines extending to the main surface portion; A pair of side fold lines extending on the main surface portion include a left fold line extending upward from the left connection point and a right fold line extending upward from the right connection point, The side fold lines are arranged so that the left fold line and the right fold line are spaced apart in the left-right direction as they go upward. A packaging bag characterized by:

[0008] (2) The side fold lines are such that the upper end of the left fold line is located on the left turn line and the upper end of the right fold line is located on the right turn line. The packaging bag according to (1) above. (3) The side fold lines are such that the upper end of the left fold line is located lower than the upper end of the left turn line, and the upper end of the right fold line is located lower than the upper end of the right turn line. The packaging bag according to (1) or (2) above.

[0009] (4) a hand hole disposed above the upper ends of the left fold line and the right fold line; The packaging bag according to any one of (1) to (3) above. (5) The side fold line is The left fold line has a lower left fold line extending along the vertical direction below the lower end of the left fold line, and an upper left fold line inclined leftward as it goes upward above the lower left fold line, The right fold line has a lower right fold line extending along the vertical direction below the lower end of the right fold line, and an upper right fold line inclined left and right as it goes upward above the lower right fold line, The upper left fold line among the left fold lines and the upper right fold line among the right fold lines are arranged so as to be spaced apart in the left-right direction as they go upward. The packaging bag according to any one of (1) to (4) above.

[0010] (6) A pair of fourth bottom fold lines including a fourth left bottom fold line connecting the left connection point and the lower edge along the vertical direction and a fourth right bottom fold line connecting the right connection point and the lower edge along the vertical direction. The packaging bag according to any one of (1) to (5) above, (7) Made of kraft paper The packaging bag according to any one of (1) to (6) above. [Effects of the Invention]

[0011] According to this invention, the usability of the packaging bag can be ensured. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing a state of a packaging bag according to an embodiment when it is unused. [Figure 2] 1 is a perspective view showing a state of a packaging bag according to an embodiment when in use. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a packaging bag as an embodiment will be described. The packaging bag of this embodiment is an envelope-type bag without a gusset. In this embodiment, a paper packaging bag (so to speak, a "paper bag") made of paper is exemplified. Such paper packaging bags can be formed from paper materials such as kraft paper, fine paper, medium-quality paper, art paper, coated paper, cast-coated paper, inkjet recording paper, Clupak paper, liner paper, and white paperboard. They can also be formed from laminated paper, in which a thermoplastic resin such as polyethylene resin is laminated on one or both sides of such paper or paperboard; nonwoven fabrics such as spunbond and spunlace; sheet materials such as plastic sheets such as synthetic paper and film; and paper materials such as laminated paper and corrugated cardboard. Among these, paper and paperboard are suitable for use as sheet materials for forming packaging bags because they are easy to recycle from waste paper. Kraft paper, Clupak paper, and paperboard are particularly suitable for use as sheet materials for forming packaging bags because of their excellent strength. The sheet materials for forming packaging bags may have a coating layer on one or both sides for the purposes of imparting water resistance, printability, and improving strength.

[0014] As described above, packaging bags, which can be made from a variety of paper materials, are flat when unused before the contents are placed inside, and when used with the contents placed inside, they expand to form a three-dimensional shape according to the outer shape of the contents. The directions used in the following explanation are defined as follows: The horizontal direction is further divided into the front-to-back direction (in the drawings, front is indicated by "F" and rear is indicated by "B") and the left-to-right direction (in the drawings, left is indicated by "L" and right is indicated by "R"). Furthermore, within the vertical direction, the direction of gravity is defined as downward (indicated by "D" in the drawings), and the opposite direction of downward is defined as upward (indicated by "U" in the drawings).

[0015] In the following description, a packaging bag is exemplified in which the opening through which contents are put in and taken out faces upward. In the packaging bag of this embodiment, all or at least some of the components may be arranged symmetrically from left to right or from front to back, or all or at least some of the components may be arranged asymmetrically from left to right or from front to back. In addition, the expressions "along," "along," and "extending along" used in this embodiment are not limited to directions parallel to a reference direction or plane, but also include directions inclined at an angle of less than 45°, such as 5° or 10°, relative to the reference direction or plane.

[0016] I. ONE EMBODIMENT In the following embodiment, the configuration of the packaging bag is described in item [1], and the action and effect of the configuration of item [1] is described in item [2]. [1. Configuration] In this section [1], the packaging bag when unused will be explained in subsection [1-1], and then the packaging bag when in use will be explained in subsection [1-2].

[0017] [1-1. Shape when not in use] As shown in Figure 1, when unused, the packaging bag 1 is not folded at the gusset fold lines, and the pair of front and rear main surface portions 2 are connected to each other by only three fold lines 3L, 3R, and 3U. The pair of front and rear main surface portions 2 are composed of a front surface portion 2F (either the first surface portion or the second surface portion) located in the front, and a rear surface portion 2B (either the first surface portion or the second surface portion) located in the rear. If the front of the packaging bag 1 is the front side and the rear side is the back side, the front surface portion 2F is located on the front side, and the rear surface portion 2B is located on the back side.

[0018] The upper edges 2FU, 2BU of the front portion 2F and the rear portion 2B are arranged at the front and rear of the opening 9 through which the contents contained in the packaging bag 1 are put in and taken out. The upper edge 2FU of the front portion 2F (hereinafter referred to as the "front upper edge") is arranged in front of the opening 9 (either one side or the other side). The upper edge 2BU of the rear portion 2B (hereinafter referred to as the "rear upper edge") is arranged behind the opening 9 (either one side or the other side).

[0019] The packaging bag 1 in FIG. 1 is shown with the front upper edge 2FU and the rear upper edge 2BU, which sandwich the opening 9 from the front and rear, slightly spaced apart, but the opening 9 is closed when the front upper edge 2FU and the rear upper edge 2BU are overlapped. The front surface portion 2F and the rear surface portion 2B illustrated in FIG. 1 are formed in the shape of sheets that are equal in size in the vertical and horizontal directions and are the same size when viewed from the front to the rear.

[0020] The three fold lines 3L, 3R, 3U include a pair of left and right (i.e., two) side fold lines 3L, 3R extending in the up-down direction, and one bottom fold line 3U extending in the left-right direction. Note that the fold lines 3L, 3R, 3U illustrated here are creases. However, known fold lines such as intermittent perforations or lead creases that combine perforations and creases may also be applied to the fold lines 3L, 3R, 3U.

[0021] The pair of left and right side fold lines 3L, 3R consists of one left fold line 3L and one right fold line 3R. The left fold line 3L is located on the left edge of the main surface portion 2. The right fold line 3R is located on the right edge of the main surface portion 2. The bottom fold line 3U is located on the bottom edge of the main surface portion 2. By folding the main surface portion 2 only along these three fold lines 3L, 3R, and 3U, the unused packaging bag 1 has an envelope-like shape without a gusset, with only the two layers of the front surface portion 2F and the back surface portion 2B overlapping. If each of the main surface portions 2 is considered to be a single surface, the unused packaging bag 1 can be said to have a flat shape with two surfaces overlapping. In this way, the flat shape of the unused packaging bag 1 can also be said to have a sheet-like or leaf-like shape.

[0022] The front surface 2F and the rear surface 2B are connected to each other at their edges except for the upper edges 2FU and 2BU. The rectangular front surface 2F and the rear surface 2B shown in Fig. 1 have four sides, one of which corresponds to the upper edge 2FU and 2BU, and the remaining three sides correspond to the three fold lines 3L, 3R, and 3U. The front surface 2F and the rear surface 2B are connected to each other by these three fold lines 3L, 3R, and 3U.

[0023] That is, the three turn lines 3L, 3R, and 3U are continuous with one another. Specifically, the lower end 3LD of the left turn line 3L (hereinafter referred to as the "lower left end") is connected to the left end of the bottom turn line 3U (the reference number is omitted because it overlaps with the lower left end 3LD). Also, the lower end 3RD of the right turn line 3R (hereinafter referred to as the "lower right end") is connected to the right end of the bottom turn line 3U (the reference number is omitted because it overlaps with the lower right end 3RD).

[0024] An opening 9 is provided between the upper end (hereinafter referred to as the "upper left end") 3LU of the left turn line 3L and the upper end (hereinafter referred to as the "upper right end") 3RU of the right turn line 3R, and the pair of side turn lines 3L, 3R are provided discontinuously. As described above, the packaging bag 1 in which the pair of front and rear main surface portions 2 are connected to each other only by the three fold lines 3L, 3R, 3U is provided with various folding lines 10, 20, 30, 40, 50, which will be described next.

[0025] The fold lines 10, 20, 30, 40, and 50 are not folded when the packaging bag 1 is not in use and is in a flat shape, and are folded when the packaging bag 1 is in use and is in a three-dimensional shape. Note that, similar to the fold lines 3L, 3R, and 3U, well-known fold lines such as creases, intermittent perforations, and lead creases that combine perforations and creases can be applied to the fold lines 10, 20, 30, 40, and 50.

[0026] These fold lines 10, 20, 30, 40, 50 are fold lines extending to each main surface portion 2, and if classified based on the position of the packaging bag 1 when in use, which will be described in detail later, they can be broadly divided into bottom fold lines 10, 20, 30, 40 for forming the bottom surface portion 7 (see Figure 2) and side fold lines 50 for forming the upright surface portion 8 (see Figure 2) that is folded up from this bottom surface portion 7. When classified based on their extension direction, the bottom fold lines 10, 20, 30, 40 of the unused packaging bag 1 can be further divided into a first bottom fold line 10 and a second bottom fold line 20 that extend along the left-right direction, a third bottom fold line 30 that extends along a direction inclined relative to the up-down and left-right directions, and a fourth bottom fold line 40 that extends along the up-down direction.

[0027] As described above, the first bottom fold line 10 extends along the left-right direction at the center of the left-right direction of the main surface portion 2. Here, an example is given in which the first bottom fold line 10 is provided on the underside of the main surface portion 2, and the other bottom fold lines 20, 30, 40 are also provided on the underside of the main surface portion 2. The second bottom fold line 20 is a fold line located on a line extending left and right (i.e., an extension line) of the first bottom fold line 10, and extends along the left and right direction as described above. This second bottom fold line 20 has a pair of left and right second bottom fold lines 21 and 22 as described below. Second left bottom fold line 21: The second bottom fold line 20 located on the line extending the first bottom fold line 10 to the left Second right bottom fold line 22: The second bottom fold line 20 located on the line extending the first bottom fold line 10 to the right

[0028] The third bottom fold line 30 is a fold line that connects the connection points 12L, 12R of the bottom fold lines 10, 20 to the lower ends 3LD, 3RD of the side fold lines 3L, 3R. This third bottom fold line 30 has a pair of left and right third bottom fold lines 31, 32 as shown below. Third left bottom fold line 31: the connection point between the first bottom fold line 10 and the second left bottom fold line 21 (hereinafter referred to as the “left connection”) The left turn line 3L is connected to the left end 3LD of the left turn line 3L. 3rd bottom fold line 30 Third right bottom fold line 32: the connection point between the first bottom fold line 10 and the second right bottom fold line 22 (hereinafter referred to as the “right connection”) The right-hand corner of the right turn line 3R is connected to the right-hand corner 3RD. 3rd bottom fold line 30

[0029] The fourth bottom fold line 40 is a fold line that connects the connection points 12L, 12R of the bottom fold lines 10, 20 and the bottom fold line 3U (i.e., the lower edge of the main surface portion 2) along the vertical direction. This fourth bottom fold line 40 has a pair of left and right fourth bottom fold lines 41, 42 as described below. Fourth left bottom fold line 41: The fourth bottom fold line 40 connecting the left connection point 12L and the bottom fold line 3U. Fourth right bottom fold line 42: The fourth bottom fold line 40 connecting the right connection point 12R and the bottom fold line 3U.

[0030] The side fold line 50 is a fold line that extends upward from the connection points 12L, 12R of the bottom fold lines 10, 20. The side fold line 50 is provided with a pair of left and right side fold lines 5L, 5R, which will be described below. Left fold line 5L: A side fold line 50 extending upward from the left connection point 12L. Right fold line 5R: A side fold line 50 extending upward from the right connection point 12R.

[0031] The side fold lines 50 are arranged so that the left fold line 5L and the right fold line 5R are spaced apart in the left-right direction as they go upward. In other words, the left fold line 5L and the right fold line 5R are spaced apart in the left-right direction as they go upward. Between these side fold lines 5L, 5R, a region (a tapered region, so to speak) is formed whose left-right dimension increases as it goes upward.

[0032] The side fold lines 50 illustrated in this embodiment are disposed so as to connect the connection points 12L, 12R and the side fold lines 3L, 3R. That is, the upper ends of the side fold lines 50 are located on the side fold lines 3L, 3R. Note that, since the side fold lines 50 extend upward from the connection points 12L, 12R, the lower ends of the side fold lines 50 are located on the connection points 12L, 12R. To describe the arrangement of such side fold lines 50 in detail for the left fold line 5L and the right fold line 5R, the upper end 1U of the left fold line 5L is located on the left fold line 3L, and the upper end 2U of the right fold line 5R is located on the right fold line 3R.

[0033] 1 is located below the upper ends 3LU and 3RU of the side fold lines 3L and 3R. Specifically, the upper end 1U of the left fold line 5L is located below the upper left end 3LU of the left fold line 3L, and the upper end 2U of the right fold line 5R is located below the upper right end 3RU of the right fold line 3R. However, the upper end 1U of the left fold line 5L may be located at a position overlapping the upper left end 3LU of the left fold line 3L, and the upper end 2U of the right fold line 5R may be located at a position overlapping the upper left end 3RU of the right fold line 3R.

[0034] Furthermore, the extending direction of each of the side folding lines 5L and 5R differs depending on the position in the up-down direction. Specifically, the left fold line 5L includes a lower left fold line 5LD that extends vertically below the left fold line 5L (side fold line 50), and an upper left fold line 5LU that is above the lower left fold line 5LD and slopes more leftward as it extends upward. Here, "below the left fold line 5L" refers to the area of ​​the left fold line 5L that includes the lower end of the left fold line 5L (the end corresponding to the left connection point 12L).

[0035] Similarly, specifically, the right fold line 5R includes a lower right fold line 5RD that extends vertically below the right fold line 5R (side fold line 50), and an upper right fold line 5RU that is above the lower right fold line 5RD and slopes more rightward as it extends upward. Note that the "below the right fold line 5R" here refers to the area of ​​the right fold line 5R that includes the lower end of the right fold line 5R (the end corresponding to the right connection point 12R).

[0036] The lower left fold line 5LD and the lower right fold line 5RD are provided parallel to each other, and the distance therebetween in the left-right direction is constant regardless of the vertical position. In contrast to the lower left fold line 5LD and the lower right fold line 5RD that run in the vertical direction, the upper left fold line 5LU and the upper right fold line 5RU are not arranged parallel to each other, but are arranged so that the distance between them in the left-right direction increases as they go upward (in other words, they are arranged in a tapered manner).

[0037] In other words, in the side fold line 50 illustrated in this embodiment, the left fold line 5L and the right fold line 5R are spaced apart in the left-right direction as they go upward, and are set to the upper left fold line 5LU and the upper right fold line 5RU, rather than the lower left fold line 5LD and the lower right fold line 5RD provided below the side fold lines 5L and 5R. In addition, a hand hole 2H is formed in the main surface portion 2. The hand hole 2H illustrated here is located above the respective upper ends 1U, 2U of the left fold line 5L and the right fold line 5R.

[0038] In this embodiment, a window 2W is provided in the main surface portion 2. The window 2W is configured to allow the internal space of the packaging bag 1 to be viewed. Here, an example is given in which the window 2W is provided only in the front surface portion 2F of the pair of front and rear main surface portions 2. The window 2W illustrated here is formed by stretching a transparent material such as a film over a hole drilled between the left and right side fold lines 50 (so-called window pasting). However, the window may be provided only in the rear surface portion 2B, or may be provided in both the front surface portion 2F and the rear surface portion 2B. Alternatively, the window may simply be a hole over which no window film is stretched. The packaging bag 1 having the above-described structure when not in use is folded along the folding lines 10, 20, 30, 40, and 50 to form the packaging bag 1 when in use, which will be described next.

[0039] [1-2. Form when in use] The packaging bag 1 when in use is formed by folding the fold lines 10, 20, 30, 40, 50 of the unused packaging bag 1 except for the fourth bottom fold line 40, while folding back the bottom fold line 3U and folding back the left and right side fold lines 3L, 3R. The packaging bag 1 folded in this manner is formed into a three-dimensional shape in which the bottom surface portion 7 and the upright surface portion 8 are folded up along the left-right and front-rear directions, as shown in FIG.

[0040] The bottom surface portion 7 is a portion that forms a surface on which the packaging bag 1 is placed, and can also be said to be a portion that faces downward relative to the opening 9. The bottom surface portion 7 is formed from two regions 71 and 72 as described below. First bottom surface area 71: Area surrounded by the first bottom fold line 10 and the second bottom fold line 20 Second bottom surface area 72: Area surrounded by the second bottom fold line 20 and the third bottom fold line 30

[0041] The first bottom surface region 71 is a rectangular region in a plan view, and is surrounded by a first bottom fold line 10 corresponding to a pair of front and rear sides along the left-right direction and a second bottom fold line 20 corresponding to a pair of left and right sides along the front-to-rear direction. This first bottom surface region 71 is exposed to the internal space of the packaging bag 1. The second bottom surface region 72 is an isosceles triangular region extending to the left and right of the first bottom surface region 71, and is surrounded by a second bottom fold line 20 corresponding to the hypotenuse of the isosceles triangle and a third bottom fold line 30 corresponding to the isosceles side of the isosceles triangle. This second bottom surface region 72 is not exposed to the internal space of the packaging bag 1, and when the packaging bag 1 is unused, the region below the second bottom fold line 20 and outside in the left-right direction of a fourth bottom fold line 40 (not shown in FIG. 2 but indicated by a dashed leader line) is folded over.

[0042] The first bottom fold line 10 surrounding the first bottom surface region 71 is a first bottom fold line 10 provided on one side of the front surface portion 2F and a first bottom fold line 10 provided on the other side of the rear surface portion 2B. The second bottom fold line 20 surrounding the first bottom surface region 71 and the second bottom surface region 72 is a second bottom fold line 20 whose front half on each of the left and right sides is provided on the front surface portion 2F, and whose rear half on each of the left and right sides is provided on the rear surface portion 2B. The third bottom fold line 30 surrounding the second bottom surface region 72 is a third bottom fold line 30 having one front side corresponding to one of the front sides of the isosceles and provided on the front surface portion 2F, and the other rear side corresponding to one of the rear sides of the isosceles and provided on the rear surface portion 2B.

[0043] In the packaging bag 1 in the first use state in which the fourth bottom fold line 40 is not folded, the first bottom region 71 and the second bottom region 72 are adjacent to each other via the second bottom fold line 20, and the bottom portion 7 is formed by the second bottom region 72 extending to the left and right from the first bottom region 71. In detail, the hexagonal bottom portion 7 is formed by the second bottom region 72 extending to the left and right of the rectangular first bottom region 71, forming an isosceles triangular shape.

[0044] In the first use state in which the second bottom surface region 72 extends to the left and right from the first bottom surface region 71 as described above, the unfolded fourth bottom fold line 40 is positioned below the folded second bottom fold line 20. The fourth bottom fold line 40, which is not folded in the first use state, is folded in a second use state (not shown) in which the second bottom surface area 72 is overlapped below the first bottom surface area 71. In the packaging bag 1 in the second use state, the fourth bottom fold line 40 is folded and the second bottom fold line 20 is folded back.

[0045] The upright portion 8 folded up from the bottom portion 7 is a cylindrical portion extending in the vertical direction, and can also be said to be a portion connecting the opening 9 and the bottom portion 7 . The vertical surface portion 8 is formed from three regions 81, 82, and 83 shown below. First elevation area 81: Area sandwiched between the side fold line 50 in the left and right directions Second elevation area 82: Area sandwiched between the side fold line 50 in the front-to-back direction Third elevation area 83: Area above the side fold line 50

[0046] The first elevation region 81 is a region located between the left fold line 5L and the right fold line 5R on each of the front surface portion 2F and the rear surface portion 2B. In this first elevation region 81, a trapezoidal first upper region 81U sandwiched between the upper left fold line 5LU and the upper right fold line 5RU is defined above a rectangular first lower region 81L sandwiched between the lower left fold line 5LD and the lower right fold line 5RD.

[0047] The second elevation region 82 is a region located between the left fold line 5L of the front portion 2F and the left fold line 5L of the rear portion 2B, and between the right fold line 5R of the front portion 2F and the right fold line 5R of the rear portion 2B, and functions as a gusset, so to speak. A rectangular second lower region 82L is defined in the second elevation region 82, sandwiched between the lower left fold line 5LD of the front portion 2F and the lower left fold line 5LD of the rear portion 2B, and between the lower right fold line 5RD of the front portion 2F and the lower right fold line 5RD of the rear portion 2B. A triangular second upper region 82U is defined above the second lower region 82L in the second elevation region 82, sandwiched between the upper left fold line 5LU of the front portion 2F and the upper left fold line 5LU of the rear portion 2B, and between the upper right fold line 5RU of the front portion 2F and the upper right fold line 5RU of the rear portion 2B.

[0048] The third elevation area 83 is an area in the main surface portion 2 above the upper ends 1U, 2U of the side fold line 50, and the front surface portion 2F and the rear surface portion 2B above the upper ends 1U, 2U of the side fold line 50 are overlapped with each other. The third elevation area 83 is provided with a hand hole 2H. In use, the packaging bag 1 having the above-described vertical regions 81 to 83 has a cubic internal space formed by the first lower region 81L of the first vertical region 81 and the second lower region 82L of the second vertical region 82, and a triangular prism-shaped internal space formed by the first upper region 81U of the first vertical region 81 and the second upper region 82U of the second vertical region 82. In the third vertical region 83, the front portion 2F and the rear portion 2B are overlapped with each other, so that no internal space is formed unless the opening 9 is opened by the user of the packaging bag 1, and the packaging bag 1 is closed not only by the opening 9 but also by the area below and in the vicinity of the opening 9.

[0049] [2. Actions and Effects] The packaging bag 1 of this embodiment has the above-described configuration, and therefore can provide the following actions and effects. (1) When unused, the sheet-like packaging bag 1 is folded along the first bottom fold line 10, the second bottom fold line 20, and the third bottom fold line 30 to form a hexagonal bottom portion 7 consisting of a rectangular first bottom region 71 and an isosceles triangular second bottom region 72 in a first use state. Using the bottom portion 7 formed in this manner as a placing surface allows the packaging bag 1 to stand stably when in use. Furthermore, by folding the envelope-type packaging bag 1 without a gusset, which is less bulky than a gusseted packaging bag when unused, as described above, a gusset of dimensions corresponding to the second bottom fold line 20 can be formed, thereby improving the capacity to accommodate contents.

[0050] Furthermore, in the packaging bag 1 of this embodiment, the left fold line 5L and the right fold line 5R are arranged so as to be spaced apart in the left-right direction as they go upward. Therefore, when the unused packaging bag 1 is folded at the side fold line 50 other than the first bottom fold line 10, the second bottom fold line 20, and the third bottom fold line 30, the front surface portion 2F and the back surface portion 2B become closer to each other as they go upward. If the left and right fold lines extend in the vertical direction, the distance between the front and rear portions will be a dimension corresponding to the second bottom fold line (specifically, a constant dimension twice the second bottom fold line) regardless of their vertical position, and an opening will be formed in the same area as the bottom surface exposed to the internal space when viewed from above.

[0051] In contrast, according to the packaging bag 1 of this embodiment, the distance between the front portion 2F and the rear portion 2B can be made shorter on the upper side of the packaging bag 1 than on the lower side, and the opening 9 can be folded and formed in a narrowed shape, so to speak. This prevents the contents contained in the packaging bag 1 from spilling out when in use, and prevents foreign matter from entering the packaging bag 1 from the outside into the inside when in use, thereby ensuring the usability of the packaging bag 1.

[0052] (2) Furthermore, the upper end 1U of the left fold line 5L is located on the left fold line 3L, and the upper end 2U of the right fold line 5R is located on the right fold line 3R. Specifically, the upper end 1U of the left fold line 5L is located below the upper left end 3LU of the left fold line 3L, and the upper end 2U of the right fold line 5R is located below the upper right end 3RU of the right fold line 3R. Therefore, in the region above the upper ends 1U and 2U of the side fold lines 5L and 5R, the planar region including the front upper edge 2FU of the front portion 2F and the planar region including the rear upper edge 2BU of the rear portion 2B can overlap with each other, thereby reliably closing the opening 9. This also makes it possible to further prevent contents contained in the packaging bag 1 from spilling out during use and to further prevent foreign objects from entering the packaging bag 1 from the outside during use, thereby further improving the usability of the packaging bag 1. Furthermore, when the upper ends 1U, 2U of the side fold lines 5L, 5R are positioned so as to overlap with the upper ends 3LU, 3RU of the fold lines 3L, 3R, the front upper edge 2FU of the front portion 2F and the rear upper edge 2BU of the rear portion 2B can be linearly overlapped, which contributes to improving the closure of the opening 9.

[0053] (3) Furthermore, since the hand hole 2H is located above the upper ends 1U, 2U of the side fold lines 5L, 5R, the hand hole 2H is located in the area where the front portion 2F and the rear portion 2B overlap each other when the packaging bag 1 is in use. This makes it possible to make the packaging bag 1 easy to carry while preventing contents contained in the packaging bag 1 from spilling out or foreign objects from entering the inside. (4) When the packaging bag 1 is in use, a cubic internal space is formed by the first lower region 81L of the first upright region 81 and the second lower region 82L of the second upright region 82 in the vertical region where the lower left fold line 5LD and the lower right fold line 5RD are provided. In such a cubic internal space, the dimension by which the front surface portion 2F and the rear surface portion 2B are spaced apart in the front-to-rear direction is constant and corresponds to the second bottom fold line 20. Therefore, the dimension by which the front surface portion 2F and the rear surface portion 2B are spaced apart in the front-to-rear direction can be secured at the lower part of the storage space of the packaging bag 1, thereby ensuring the storage capacity of the contents.

[0054] (5) In a second use state in which the packaging bag 1 in the first use state is folded at the fourth bottom fold line 40, the second bottom surface region 72 is overlapped below the first bottom surface region 71, and the packaging bag 1 can be used without the second bottom surface region 72 extending beyond the first bottom surface region 71. In this way, whether or not the second bottom surface region 72 extends can be switched by whether or not the fourth bottom fold line 40 is folded, which also contributes to improving the usability of the packaging bag 1. (6) In addition, if the packaging bag 1 is made of kraft paper, it can be recycled as waste paper without using resin materials (promoting the so-called "plastic-free" movement), as compared to plastic packaging bags.

[0055] [II. Modifications] The above-described embodiment is merely an example, and is not intended to exclude various modifications and application of techniques not explicitly stated in this embodiment. Each configuration of this embodiment can be modified and implemented in various ways without departing from the spirit of the invention. Furthermore, it is possible to select and combine as needed.

[0056] The side fold lines may be arranged so that the left and right fold lines are spaced apart in the left-right direction as they go upward. For example, the side fold lines are not limited to those having parallel portions, such as the lower left fold line and the lower right fold line described above in one embodiment, but may also have no parallel portions. The hand hole does not have to be positioned above the side fold line, but can be positioned at any location on the packaging bag. However, the hand hole and the window may be omitted from the packaging bag. In addition, the fourth bottom fold line may be omitted from the packaging bag. [Explanation of symbols]

[0057] 1 packaging bag 10 First bottom line 12L, 12R connection points 12L left connection point 12R right connection point 1U Top end of left fold line 5L 2 Main surface 20 Second bottom fold line 21 Second bottom left fold line 22 Second right bottom broken line 2B Rear surface (either the first surface or the second surface) 2BU Rear upper edge (upper edge) 2F Front section (either the first or second section) 2FU Front upper edge (upper edge) 2H hand hole 2U Upper end of right bend line 5R 2W Window 30 Third bottom broken line 31 Third left bottom fold line 32 Third right bottom broken line 3L, 3R Pair of side fold lines 3L Left turn line 3LD Lower left edge (lower edge) 3LU Upper left edge (upper edge) 3R right turn line 3RD Lower right edge (lower edge) 3RU Upper right edge (top edge) 3U bottom fold line 40 Fourth bottom broken line 41 Fourth left bottom fold line 42 Fourth right bottom fold line 50 side fold line 5L Left fold line 5LD Lower left broken line 5LU upper left broken line 5R right broken line 5RD lower right broken line 5RU upper right fold line 7 Bottom 71 First bottom area 72 Second bottom area 8 Facade 81 First Facade Area 81L The first ロアrealm 81U The first アッパrealm 82 Second Facade Area 82L Second Royal Domain 82U The second アッパrealm 83 The Third Facade 9 Opening

Claims

1. A gussetless envelope-type packaging bag, in which a pair of main surface portions, each composed of a first surface portion whose upper edge is located on one side of an opening and a second surface portion whose upper edge is located on the other side of the opening, are connected by only three fold lines: a bottom fold line which is a fold line located at the lower edge of the main surface portions and extending along the left-right direction; a pair of side fold lines which are a left fold line which is a fold line extending along the up-down direction on the left edge of the main surface portions; and a right fold line which is a fold line extending along the up-down direction on the right edge of the main surface portions, A first bottom fold line extending along the left-right direction at the left-right center of the main surface portion; A second left bottom fold line is located on an extension line extending leftward from the first bottom fold line, and a second right bottom fold line is located on an extension line extending rightward from the first bottom fold line, and a pair of second bottom fold lines extending on the main surface portion; A third left bottom fold line connecting the left connection point, which is the connection point between the first bottom fold line and the second left bottom fold line, and the lower end of the left fold line, and a third right bottom fold line connecting the right connection point, which is the connection point between the first bottom fold line and the second right bottom fold line, and the lower end of the right fold line, and a pair of third bottom fold lines extending to the main surface portion; A pair of side fold lines extending on the main surface portion include a left fold line extending upward from the left connection point and a right fold line extending upward from the right connection point, The side fold lines are arranged so that the left fold line and the right fold line are spaced apart in the left-right direction as they go upward. A packaging bag characterized by:

2. The side fold lines are such that the upper end of the left fold line is located on the left turn line and the upper end of the right fold line is located on the right turn line. The packaging bag according to claim 1 .

3. The side fold lines are such that the upper end of the left fold line is located lower than the upper end of the left turn line, and the upper end of the right fold line is located lower than the upper end of the right turn line. The packaging bag according to claim 2 .

4. a hand hole disposed above the upper ends of the left fold line and the right fold line; The packaging bag according to claim 3 .

5. The side fold line is The left fold line has a lower left fold line extending along the vertical direction below the lower end of the left fold line, and an upper left fold line inclined leftward as it goes upward above the lower left fold line, The right fold line has a lower right fold line extending along the vertical direction below the lower end of the right fold line, and an upper right fold line inclined left and right as it goes upward above the lower right fold line, The upper left fold line among the left fold lines and the upper right fold line among the right fold lines are arranged so as to be spaced apart in the left-right direction as they go upward. The packaging bag according to any one of claims 1 to 4.

6. A pair of fourth bottom fold lines including a fourth left bottom fold line connecting the left connection point and the lower edge along the vertical direction and a fourth right bottom fold line connecting the right connection point and the lower edge along the vertical direction. The packaging bag according to claim 1 .

7. Made of kraft paper The packaging bag according to claim 1 .

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