Packaging bags

Abstract

To provide a packaging bag and a PTP packaging sheet which can be easily opened to an end, without hitting a content by a cut, and without tearing an opening piece on the way, when opening.SOLUTION: Opening assistance lines 15 and 16 are provided at positions near an upper long side 1u of each of a front side sheet portion 1a and a back side sheet portion 1b constituting a pillow packaging bag 1 so as to match each other in plan view. The opening assistance line 15 includes: a straight portion 15a extending along a longitudinal direction, a first arc portion 15b continuous with an end portion of the straight portion 15a on a first seal portion 13 side, and a second arc portion 15c continuous with the other end of the straight portion 15a. The opening assistance line 16 includes a straight portion, a first arc portion, and a second arc portion as well. In consideration of a size of a space for storing a content of the pillow packaging bag 1 and a size of the contents, positions of the opening assistance lines 15 and 16 are determined, and by making a cut advance along the opening assistance lines 15 and 16, the cut can be avoided from hitting a content, and tearing of an opening piece can be suppressed, so that a packaging bag can be easily opened.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention is In the bag Regarding. [Background technology]

[0002] A pillow packaging bag using a laminate of flexible packaging films is a packaging bag in which the left and right ends of a flexible packaging film are fused together to face each other to form a cylindrical shape, and the top and bottom of the cylindrical shape are sealed. These pillow packaging bags are usually opened by grasping one end of the top seal or bottom seal and following the side of the spine seal, and various measures have been taken to make them easier to open by hand, such as providing an opening notch or a half-cut line as an opening guide line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-66442 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the contents of the pillow packaging bag are relatively hard, such as a PTP (press through pack) packaging sheet with a number of tablets aligned, even if an opening notch or opening guide line is provided, the slit may hit the contents during opening, requiring greater force to continue opening. Alternatively, the opening strip may be torn midway when hitting the contents, making it difficult to form a new slit even when trying to continue opening, and the opening must be forcibly widened, resulting in problems of poor usability.

[0005] Therefore, this invention has been made with an eye on the above-mentioned unsolved problems of the conventional art, and provides a packaging that can be easily opened to the end without the cut line hitting the contents or the opening strip being torn off, even when a relatively hard PTP packaging sheet or the like is contained. The bag It is intended to provide. [Means for solving the problem]

[0006] In order to achieve the above object, according to one aspect of the present invention, there is provided a packaging bag for contents that is rectangular in plan view, which comprises a front sheet portion and a back sheet portion that are rectangular in plan view, and a seal portion that bonds the back sides of at least one of the four sides of the front sheet portion and the back sheet portion together, and in which a rectangular space is formed between the back sides of the front sheet portion and the back sheet portion, the front sheet portion and the back sheet portion each have an opening assisting line that extends in a second direction perpendicular to the first direction, at a position close to an end along a first direction that is the direction in which the seal portion extends, and the opening assisting line has a straight portion that extends in the second direction and a circular portion that has one end that is continuous with the end of the straight portion on the seal portion side and that follows a corner of the packaging bag. a first arc-shaped portion, and an arc-shaped corner of the contained item facing the first arc-shaped portion when the contained item is contained in the space; the length of the space in the first direction is Y, the length of the space in the second direction is L, the length of the side of the contained item extending in the first direction when the contained item is contained in the packaging bag is y, the length of the side extending in the second direction is l, in a plan view, the gap in a direction parallel to the second direction between the end opposite the straight portion of the first arc-shaped portion and the end of the space on the sealed portion side is a, the gap between the straight portion and the end of the space closer to the straight portion is b, the radius of the arc of the first arc-shaped portion is R, and the radius of the arc of the corner of the contained item facing the first arc-shaped portion is r, all of the following formulas (1) to (3) are satisfied. 1(mm)≦a(mm)≦(Ll) / 2(mm) ……(1) 1(mm)≦b(mm)≦(Yy) / 2(mm) ……(2) r(mm) <R(mm) ……(3 ) [Effects of the Invention]

[0007] According to one aspect of the present invention, even if a packaging bag contains a relatively hard item such as a PTP packaging sheet, when opening the packaging bag, the cut line can be prevented from hitting the item or the opening strip can be prevented from breaking during opening, making the opening process easy. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are schematic diagrams showing an example of a pillow packaging bag according to the present invention, in which (a) is a plan view and (b) is a rear view. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of each thickness, etc., differ from the actual ones. Furthermore, the embodiments shown below are merely examples of configurations for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention is not limited to the materials, shapes, etc. of the components described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims.

[0010] Fig. 1 is a diagram showing a schematic configuration of one embodiment of a packaging bag according to the present invention, in which the packaging bag according to the present invention is applied to a pillow packaging bag. In Fig. 1, (a) is a plan view, and (b) is a rear view of Fig. 1. In Fig. 1(a), the contents are indicated by solid lines for ease of understanding. The packaging bag according to the present invention is not limited to pillow packaging bags, but can also be applied to three-sided sealed packaging bags and four-sided sealed packaging bags, and can also be applied to packaging bags in which a seal portion is formed on at least one of the four sides of a rectangular packaging bag, and which is opened from this seal portion toward the other opposite side.

[0011] 1 is a pillow packaging bag 1 that is designed to accommodate a rectangular flat sheet in a plan view, more specifically, a pillow packaging bag that accommodates a rectangular PTP packaging sheet on which a plurality of tablets are aligned. Note that the flat sheet is not limited to a PTP packaging sheet, but may be a sheet made of a relatively thin and hard material, that is, a material whose opening flap will tear when it hits the contents when opening the bag.

[0012] Pillow packaging bag 1 has a rectangular shape in a plan view, with a longitudinal length of, for example, about 15 cm and a lateral length of, for example, about 4 cm. Pillow packaging bag 1 has a tubular body portion 12 formed by, for example, fusing together the left and right ends of a film-like laminate to form a palm-seam seal portion 11, and in Figure 1, the left and right ends of tubular body portion 12 are bonded with a first seal portion 13 and a second seal portion 14, respectively, to form a space for containing contents M. The sides formed by first seal portion 13 and second seal portion 14 form the short sides of the rectangle, and the sides at both ends of the portion of tubular body portion 12 sandwiched between first seal portion 13 and second seal portion 14 form the long sides of the rectangle. The film-like laminate is configured to include an aluminum layer, and is configured by laminating, for example, a PET (polyethylene terephthalate) layer (12 μm to 25 μm), a PE (polyethylene) layer (15 μm to 30 μm), an aluminum layer (7 μm to 20 μm), and a PE layer (20 μm to 50 μm) in this order. However, the configuration of the film-like laminate is not limited to this. For example, a laminate in which a PBT (polybutylene terephthalate) layer (10 μm to 25 μm), a PE (polyethylene) layer (15 μm to 30 μm), an aluminum layer (7 μm to 20 μm), and a PE layer (20 μm to 50 μm) are laminated in this order; a laminate in which a NY (nylon) layer (15 μm to 25 μm), a PE ... The laminate may be a laminate in which a paper (50 g to 120 g), a PE layer (15 μm to 30 μm), an aluminum layer (7 μm to 20 μm), and a PE layer (20 μm to 50 μm) are laminated in this order; a laminate in which a paper (50 g to 120 g), a PE layer (15 μm to 30 μm), an aluminum layer (7 μm to 20 μm), and a PE layer (20 μm to 50 μm) are laminated in this order; or a laminate in which an OPP (biaxially oriented polypropylene film) layer (20 μm to 30 μm), a PE layer (15 μm to 30 μm), an aluminum layer (7 μm to 20 μm), and a PE layer (20 μm to 50 μm) are laminated in this order.

[0013] The first seal portion 13 and the second seal portion 14 are each formed with a series of sawtooth-shaped portions 13a and 14a extending in the direction in which the first seal portion 13 and the second seal portion 14 extend. The sawtooth-shaped portions 13a and 14a are each formed with a series of triangles that convex on the opposite side of the first and second seal portions 13 and 14, and have a shape with repeated peaks and valleys in the direction in which the first and second seal portions 13 and 14 extend, respectively, with the valleys serving as incisions for initiating opening. The positions of the valleys of the sawtooth-shaped portions 13a and 14a are determined according to the positions of the opening assisting lines 15 and 16 described below. Specifically, at least one valley of the sawtooth-shaped portions 13a and 14a passes through this valley, and the straight line parallel to the straight line portions 15a and 16a of the opening assisting lines 15 and 16 is positioned so that it overlaps with the first arc portions 15b and 16b and the second arc portions 15c and 16c described below.

[0014] The sheet on the side of the pillow packaging bag 1 where the seam seal portion 11 is not formed is referred to as the front sheet portion 1a, and the sheet on the side where the seam seal portion 11 is formed is referred to as the back sheet portion 1b. In addition, in Fig. 1, the upper long side of the pillow packaging bag 1 is referred to as the upper long side 1u, and the lower long side is referred to as the lower long side 1d. An opening assisting line 15 is formed on the front sheet portion 1a along the longitudinal direction of the pillow packaging bag 1, and an opening assisting line 16 is formed on the back sheet portion 1b along the longitudinal direction of the pillow packaging bag 1, and the opening assisting lines 15 and 16 are formed so as to coincide with each other in a plan view. The opening assisting lines 15 and 16 are provided at positions close to the upper long side 1u of the pillow packaging bag 1.

[0015] The opening assisting line 15 consists of a straight line portion 15a, a first arc portion 15b continuing from the end of the straight line portion 15a on the first seal portion 13 side, and a second arc portion 15c continuing from the end of the straight line portion 15a on the second seal portion 14 side, and has a shape that is linearly symmetrical with respect to a straight line passing through the longitudinal center of the cylindrical body portion 12. Similarly, the opening assisting line 16 is composed of a straight line portion 16a, a first arc portion 16b continuing from the end of the straight line portion 16a on the first seal portion 13 side, and a second arc portion 16c continuing from the end of the straight line portion 16a on the second seal portion 14 side, and has a shape that is line-symmetrical about a line that passes through the longitudinal center of the cylindrical body portion 12. The opening assisting line 15 and the opening assisting line 16 are formed so as to be line-symmetrical about the upper long side 1u as an axis of symmetry.

[0016] First arc portions 15b, 16b and second arc portions 15c, 16c may be arcs of a perfect circle with a central angle of 90 degrees, or arcs of an ellipse with a central angle of 90 degrees. Furthermore, the tangents at the ends of the arcs may be slightly angled from parallel to a line segment parallel to the longitudinal direction of pillow packaging bag 1, and similarly, the tangents at the ends of the arcs may be slightly angled from parallel to a line segment parallel to the lateral direction of pillow packaging bag 1. The lengths of the first arc portions 15b, 16b and the second arc portions 15c, 16c, i.e., the positions of the ends of the first arc portions 15b, 16b and the second arc portions 15c, 16c opposite the straight portions 15a, 16a, are set at the intersections of the arcs of the first and second arc portions with straight lines parallel to the first and second seal portions 13, 14 that satisfy the gap a described below.

[0017] The opening assisting lines 15 and 16 are half-cut lines formed by, for example, laser processing etc. The half-cut lines are formed so as not to penetrate the aluminum layer. As shown in Fig. 1, the opening assisting lines 15 and 16 may be formed only on one long side of the pillow packaging bag 1 (top long side 1u in Fig. 1), or on each of the opposing long sides (top long side 1u and bottom long side 1d). When forming opening assisting lines on each of the opposing long sides, the pillow packaging bag 1 shown in Fig. 1 can be turned upside down and formed in the same manner as opening assisting lines 15 and 16. When opening assisting lines are formed along each of a pair of long sides on the front-side sheet portion 1a, the opening assisting line formed along one long side and the opening assisting line formed along the other long side are formed so as to be line-symmetrical with respect to a line segment parallel to the long sides passing through the center of the front-side sheet portion 1a in the short direction. The same applies to the opening assisting lines formed on the back-side sheet portion 1b.

[0018] The opening assisting lines 15, 16 are formed so as to satisfy all of the following formulas (1) to (3). 1(mm)≦a(mm)≦(Ll) / 2(mm) ……(1) 1(mm)≦b(mm)≦(Yy) / 2(mm) ……(2) r(mm) <R(mm) ……(3)

[0019] The symbols in the formulas (1) to (3) represent the following values. L: The length of the space for storing the contents M in the pillow packaging bag 1 in the longitudinal direction (first direction) of the pillow packaging bag 1 Y: The length of the space for accommodating the contents M in the pillow packaging bag 1 in the short direction of the pillow packaging bag 1 (the second direction perpendicular to the first direction) in a plan view l: length of a side of the item M in a plan view that extends in the longitudinal direction (first direction) of the pillow packaging bag 1 when the item M is contained in the pillow packaging bag 1 y: length of the side of the item M that extends in the short direction (second direction) of the pillow packaging bag 1 when the item M is contained in the pillow packaging bag 1 a: In plan view, the gap in the direction parallel to the longitudinal direction (second direction) between the end of first arcuate portions 15b, 16b on the opposite side to straight portions 15a, 16a and the end of the space for accommodating contents M of pillow packaging bag 1 on the first seal portion 13 side b: In plan view, the gap between the straight line portion 15a (16a) and the end of the space for storing the contents M of the pillow packaging bag 1, which is closer to the straight line portion 15a R: Radius of the arc of the first arc portions 15b and 16b r: radius of the arc of the corner of the item M that faces the first arc portions 15b and 16b when the item M is accommodated in the space for accommodating the item M in the pillow packaging bag 1

[0020] <Operation when opening> As shown in FIG. 1, a plate-shaped content M such as a PTP packaging sheet is contained in a pillow packaging bag 1 having opening assisting lines 15, 16 formed therein and having a rectangular shape in a plan view. When opening this pillow packaging bag 1, the user places the front sheet portion 1a toward the user, starts opening at the valley portion on the upper long side 1u of the sawtooth-shaped portion 13a, makes a slit in the first seal portion 13, and then pulls the opening strip toward the second seal portion 14. Generally, when opening pillow packaging bag 1, particularly when the contents are medicine or the like, the user turns front sheet portion 1a of pillow packaging bag 1, on which the contents' names and other information are written, toward themselves to check the contents, and then grasps the peaks of sawtooth portion 13a on the first seal portion 13 side with both hands. Based on the margin between pillow packaging bag 1 and the contents, users tend to intuitively select a position where the slit will not collide with the contents when opening. Therefore, users begin to open pillow packaging bag 1 using the valleys of sawtooth portion 13a located near upper long side 1u as a guide.

[0021] 1, opening assisting line 15 is located near upper long side 1u, and at least one of the valleys of sawtooth portion 13a is located so that a straight line passing through this valley and parallel to linear portion 15a overlaps with first arc portion 15b. Therefore, when a cut is made from a valley selected as a position where the cut will not collide with the contents when opening, the cut progresses from the valley through first seal portion 13 toward tubular body portion 12, approximately parallel to linear portion 15a, and eventually reaches first arc portion 15b. Therefore, when the opening flap is continued to be pulled toward second seal portion 14, the cut is guided along first arc portion 15b and moves to linear portion 15a, and then progresses along linear portion 15a.

[0022] At this time, because there is a margin of gap b in the short direction between the contents M and the pillow packaging bag 1, the tear strip is guided to the opening assisting line 15 without hitting the contents. Therefore, the tear strip is guided by the opening assisting line 15 and advances to the second sealed portion 14 side, and as a result, the tear strip is opened without being torn off along the way. Furthermore, opening assisting lines 15 and 16 are formed not only on the front sheet portion 1a but also on the back sheet portion 1b, and are formed so that they entirely overlap in a plan view. As a result, cuts are formed in both the front sheet portion 1a and the back sheet portion 1b at approximately the same positions and at approximately the same timing, allowing the package to be opened.

[0023] <Effects> (1) The pillow packaging bag 1 is formed so that the shape of the contents of the pillow packaging bag 1, the size of the space of the pillow packaging bag 1, and the opening assisting lines 15, 16 satisfy the above formulas (1) to (3). As a result, the slit can be guided along the opening assisting lines 15, 16, which prevents the slit from hitting the contents or tearing the opening strip during opening. This makes the opening process easier. (2) Furthermore, the opening assisting lines 15, 16 are arcs with a central angle of approximately 90 degrees, and do not extend in a direction substantially parallel to the first and second sealed portions 13, 14. This prevents the tear from progressing along the first and second sealed portions 13, 14 toward the bottom long side 1d when opening the package.

[0024] (3) Furthermore, by arranging at least one of the valleys of the sawtooth-shaped portion 13a at a position where a straight line passing through this valley and parallel to the linear portion 15a overlaps with the first arc-shaped portion 15b, it is possible to guide the opening start position of the sawtooth-shaped portion 13a, where the position where the cutting progresses is predicted to overlap with the first arc-shaped portion 15b. Therefore, even if the cutting does not reach the opening assisting lines 15 and 16 in the first and second sealed portions 13 and 14, it is not necessary to provide the opening assisting lines in the first and second sealed portions 13 and 14. Thus, by providing the opening assisting lines, it is possible to suppress the occurrence of aluminum cracks in the first and second sealed portions 13 and 14, thereby reducing the possibility of aluminum cracks occurring during transportation, etc.

[0025] (4) Furthermore, in busy situations, such as when distributing tablets contained in PTP packaging sheets M to patients in hospitals, it is a hassle just to remove the PTP packaging sheet M from the pillow packaging bag 1. Under such circumstances, if the cut hits the PTP packaging sheet M during opening, more force is required to advance the cut further, especially because the film-like laminate that forms the pillow packaging bag 1 contains an aluminum layer. Also, if the opening strip is torn off, force is required to make another cut, and the fact that the pillow packaging bag 1 cannot be opened in one operation is a burden.

[0026] As described above, the pillow packaging bag 1 according to this embodiment can be opened in a single operation by opening along the opening assisting lines 15, 16. The opening assisting lines 15, 16 are provided in the opening direction, i.e., the longitudinal direction, and are longer than the longitudinal length 1 of the PTP packaging sheet M, which is the contents. Therefore, opening along the opening assisting lines 15, 16 provides an opening sufficient for removing the PTP packaging sheet M from the pillow packaging bag 1. It is also conceivable that the opening assisting lines 15, 16 are not straight, but that a crank-shaped opening assisting line extending in the transverse direction is provided midway along the longitudinal direction, i.e., the opening direction, to facilitate removing the contents from the pillow packaging bag 1. However, if a crank-shaped portion is provided midway along the opening direction, the force required to open the pillow packaging bag 1 may be weakened, making it difficult to open, particularly because the film-like laminate forming the pillow packaging bag 1 contains an aluminum layer. Furthermore, the slit may come into contact with the PTP packaging sheet M and cause it to deviate from the opening assisting line. The opening assist line of the pillow packaging bag 1 according to this embodiment has straight line portions 15a and 16a along the longitudinal direction of the PTP packaging sheet M, which is the contents. This prevents the force required to open the bag from weakening during opening, and the opening assist line is longer than the longitudinal length 1 of the PTP packaging sheet M, which is the contents, and allows for a relatively large opening, so the PTP packaging sheet M can be easily removed without providing a crank-shaped portion.

[0027] <Modification> (1) In the above embodiment, the first seal portion 13 and the second seal portion 14 are provided with sawtooth-shaped portions 13a, 14a, and the valleys of the sawtooth-shaped portions 13a, 14a indicate the cut edge for starting the opening. However, this is not limited to this. It is also possible to provide notches directly in the first seal portion 13 and the second seal portion 14 without providing sawtooth-shaped portions 13a, 14a. Furthermore, the location of the cut edge may be indicated by a symbol such as an arrow or by a word such as "opening edge" without providing a notch or with a notch, so that the user can recognize the location of the cut edge.

[0028] (2) In the above embodiment, the first arc portions 15b, 16b and the second arc portions 15c, 16c are provided as the opening assist lines 15, 16, but only the first arc portions 15b, 16b may be provided. For example, by clearly indicating the opening start position, if it is determined that the opening start point is to be made from a position near the upper long side 1u on the first seal portion 13 side with the front sheet portion 1a of the pillow packaging bag 1 facing forward, and that the opening start point is to be made from this position, the opening start point will not be from the second seal portion 14 side. Therefore, the end portions of the straight portions 15a, 16a opposite the first arc portions 15b, 16b may be extended directly toward the second seal portion 14 side. For the same reason, the opening assistance lines 15, 16 need only be provided on the upper long side 1u side. Conversely, by providing the opening assistance lines 15, 16 on both the upper long side 1u and the lower long side 1d of the pillow packaging bag 1, the user can easily open the bag regardless of whether they open it from the upper long side 1u or the lower long side 1d. [Example]

[0029] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to the following examples in any way. Example 1 A film laminate having a 12 μm PET layer, a 13 μm PE layer, a 9 μm aluminum layer, and a 20 μm PE layer laminated in this order was used to produce a pillow packaging bag 1 with opening assist lines 15, 16 formed only on the upper long side 1u. The space for containing contents in the produced pillow packaging bag 1 has a long side length L of 140 mm and a short side length Y of 46 mm, and the PTP packaging sheet used as the contents has a long side length l of 120 mm and a short side length y of 40 mm. In this case, the gap a between the end of each of the first arcuate portions 15b, 16b on the side of the linear portions 15a, 16a and the first sealed portion 13, and the gap b between the linear portion 15a and the end of the space for containing contents in the pillow packaging bag 1 near the upper long side 1u must satisfy 1≦a≦10 and 1≦b≦3, based on the above formulas (1) and (2). The design values ​​of each parameter are: gap a is 1 mm, gap b is 1 mm, radius r of the arc of the contained object is 5 mm, and radius R of the arc of first arc portions 15b and 16b is 10 mm.

[0030] Example 2 The design values ​​of the parameters are the same as those in Example 1, except that the gap a is set to 5 mm. Example 3 The design values ​​of the parameters are the same as those of Example 1, except that the gap a is set to 10 mm. Example 4 The design values ​​of the parameters are the same as those of Example 1, except that the gap b is set to 2 mm. Example 5 The design values ​​of the parameters are the same as those of Example 4, except that the gap a is set to 5 mm. Example 6 The design values ​​of the parameters are the same as those of Example 4, except that the gap a is set to 10 mm. Example 7 The design values ​​of the parameters are the same as those in Example 1, except that the gap b is set to 3 mm. Example 8 The design values ​​of the parameters are the same as those of Example 7, except that the gap a is set to 5 mm. Example 9 The design values ​​of the parameters are the same as those of Example 7, except that the gap a is set to 10 mm.

[0031] Example 10 The design values ​​of the parameters are the same as those of Example 1, except that the radius R of the arcs of the first and second arcuate portions 15b, 16b, 15c, and 16c is set to 6 mm. Example 11 The design values ​​of the parameters were the same as in Example 10 except that the gap a was set to 10 mm and the gap b was set to 3 mm. Example 12 The length L of the long side of the space in Example 1 was 115 mm, the length Y of the short side was 58 mm, and the length l of the long side of the PTP packaging sheet as the contents was 89 mm, the length y of the short side was 40 mm, except that this was the same as Example 1. In this case, the gap a was 1≦a≦13, and the gap b was 1≦b≦9.

[0032] Example 13 The design values ​​of the parameters are the same as those of Example 12, except that the gap a is set to 7 mm. Example 14 The design values ​​of the parameters are the same as those of Example 12, except that the gap a is set to 13 mm. Example 15 The design values ​​of the parameters are the same as those of Example 12, except that the gap b is set to 5 mm. Example 16 The design values ​​of the parameters are the same as those of Example 15, except that the gap a is set to 7 mm. Example 17 The design values ​​of the parameters are the same as those of Example 15, except that the gap a is set to 13 mm. Example 18 The design values ​​of the parameters are the same as those of Example 15, except that the gap b is set to 9 mm. Example 19 The design values ​​of each parameter are the same as those of Example 18, except that the gap a is set to 7 mm. Example 20 The design values ​​of the parameters are the same as those of Example 18, except that the gap a is set to 13 mm.

[0033] Example 21 The design values ​​of the parameters are the same as those of Example 12, except that the radius R of the arcs of the first and second arcuate portions 15b, 16b, 15c, and 16c is set to 6 mm. Example 22 The design values ​​of the parameters are the same as those of Example 20, except that the radius R of the arcs of the first and second arcuate portions 15b, 16b, 15c, and 16c is set to 6 mm.

[0034] (Comparative Example 1) The design values ​​of the parameters are the same as in Example 1, except that the gap a is 15 mm and the gap b is 2 mm. (Comparative Example 2) The design values ​​of the parameters are the same as in Example 1, except that the gap a is set to 0 mm and the gap b is set to 2 mm. (Comparative Example 3) The design values ​​of the parameters are the same as in Example 1, except that the gap a is set to 5 mm and the gap b is set to 0 mm. Comparative Example 4 The design values ​​of the parameters are the same as in Example 1, except that the gap a is 5 mm and the gap b is 4 mm.

[0035] (Comparative Example 5) The design values ​​of each parameter are the same as in Example 1, except that the gap a is 5 mm, the gap b is 2 mm, the arc radius r of the contained item is 6 mm, and the arc radius R of the first and second arc portions 15b, 16b, 15c, and 16c is 5 mm. (Comparative Example 6) The design values ​​of each parameter are the same as in Example 1, except that the gap a is 5 mm, the gap b is 2 mm, the arc radius r of the contained item is 10 mm, and the arc radius R of the first and second arc portions 15b, 16b, 15c, and 16c is 5 mm.

[0036] <Performance evaluation> (1) The openability of each pillow packaging bag in the Examples and Comparative Examples was evaluated. Each pillow packaging bag was opened and subjected to a sensory evaluation. When opened, if the bag could be torn all the way to the end without hitting the PTP packaging sheet containing the contents, it was marked as "Good", and if the bag hit the PTP packaging sheet containing the contents (including if the bag could not be torn all the way to the end), it was marked as "Poor". (2) The transport suitability of each pillow packaging bag in the Examples and Comparative Examples was evaluated. The transport suitability of each pillow packaging bag was evaluated at a speed of 5.8 m / s 2 The vibration test was conducted for 180 minutes at an acceleration of 100°C. The vibration test was conducted in accordance with the JIS Z0200:2013 standard. If the pillow packaging bag had no scratches or damage on its exterior after the vibration test, it was rated as suitable for transportation as "Good", and if it had scratches or damage on its exterior, it was rated as "Poor".

[0037] (3) The occurrence of aluminum cracks was evaluated for each pillow packaging bag in the Examples and Comparative Examples. Each pillow packaging bag was subjected to a drop test in both horizontal and vertical directions from a height of 60 cm, and the surface was observed. The drop test was conducted in accordance with the JIS Z0200:2013 standard. The surface of the pillow packaging bag after the drop test was observed. The cross section of the pillow packaging bag after the drop test was observed under a microscope, and if there were no scratches, it was marked as "○", and if there were scratches, it was marked as "×". If all the evaluation results for (1) to (3) above were "○", the overall rating (comprehensive rating) was "○" or "◎", and if any one of the evaluation results was "×", the overall rating was "×". The evaluation results and overall comments for (1) to (3) above are shown in Table 1.

[0038] [Table 1]

[0039] As shown in Table 1, when the gap a between the first seal portion 13 and the end opposite the straight portion of the first arc portion is larger than the specified range (Comparative Example 1), after a cut is made in the first seal portion 13, no opening assistance line is formed between the first seal portion 13 and the opening assistance line, so even if it is pulled straight in the direction of the second seal portion 14, it may bend and hit the PTP packaging sheet containing the contents.

[0040] Conversely, when the gap a is smaller than the specified range (Comparative Example 2), there is no room in the longitudinal direction of the pillow packaging bag, and scratches, aluminum cracks, etc. occur when the bag is subjected to vibration or dropped. Furthermore, when the gap b is smaller than the allowable range (Comparative Examples 3 and 4), there is no room in the short direction of the pillow packaging bag, so more force is required to open it, and the opening slit along the edge of the PTP packaging sheet hits the PTP packaging sheet inside, making it difficult to open, and the opening strip is easily torn off.

[0041] Furthermore, even if there is a gap between the pillow packaging bag and the PTP packaging sheet contained in this pillow packaging bag, if the radius r of the arc on the PTP packaging sheet side is larger than the radius R of the arc of the first arc portion or the second arc portion of the opening assisting line, the first arc portion of the opening assisting line will not be able to sufficiently guide the cut to the straight portion, and the cut will likely hit the PTP packaging sheet. In contrast, in the case of Examples 1 to 22, which satisfy all of the above formulas (1) to (3), it was confirmed that the packages were easy to open along the opening assist line, and good results were obtained in both openability and transport suitability. [Explanation of symbols]

[0042] 1 pillow packaging bag 1a Front sheet part 1b Back sheet part 1u top long side 1d bottom long side 11. Joint seal 12 Cylindrical body 13 First seal part 13a Sawtooth-shaped portion 14 Second seal part 14a Sawtooth-shaped portion 15, 16 Opening aid line 15a, 16a Straight section 15b, 16b First arc section 15c, 16c Second arc section

Claims

1. A packaging bag for contents having a rectangular shape in a plan view, the packaging bag having a front sheet portion and a back sheet portion having a rectangular shape in a plan view, and a seal portion bonding the back sides of at least one of the four sides of the front sheet portion and the back sheet portion together, the packaging bag having a rectangular shape in a plan view, the packaging bag having a rectangular shape in a plan view, and a seal portion bonding the back sides of at least one of the four sides of the front sheet portion and the back sheet portion together, Each of the front sheet portion and the back sheet portion has an opening assisting line extending in a second direction perpendicular to a first direction, the opening assisting line being located near an end along the first direction, the first direction being the direction in which the seal portion extends; the opening assisting line has a straight line portion extending along the second direction, and a first arc portion whose one end is continuous with an end portion of the straight line portion on the seal portion side and which is arc-shaped along a corner portion of the packaging bag, When the object is contained in the space, a corner portion facing the first arc portion has an arc shape, The length of the space in the first direction is defined as Y, and the length of the space in the second direction is defined as L, The length of a side of the item that extends in the first direction when the item is contained in the packaging bag is defined as y, and the length of a side of the item that extends in the second direction is defined as 1, In a plan view, a gap in a direction parallel to the second direction between an end of the first arc portion opposite to the linear portion and an end of the space on the seal portion side is defined as a, and a gap between the linear portion and an end of the space closer to the linear portion is defined as b, A packaging bag characterized in that, when the radius of the arc of the first arc portion is R and the radius of the arc of the corner portion of the contained item that faces the first arc portion is r, all of the following formulas (1) to (3) are satisfied. 1 (mm) ≦ a (mm) ≦ (L-l) / 2 (mm) ... (1) 1 (mm)≦b (mm)≦(Y-y) / 2 (mm) ……(2) r(mm)<R(mm)...(3)

2. 2. The packaging bag according to claim 1, wherein the opening assist line has a second arc-shaped portion at an end of the straight portion opposite to the first arc-shaped portion, the second arc-shaped portion following a corner of the packaging bag.

3. 3. The packaging bag according to claim 1, wherein the opening assisting lines are formed at positions near the ends of both ends along the first direction.

4. The packaging bag according to any one of claims 1 to 3, wherein the contents are plate-shaped sheets.

5. 4. The packaging bag according to claim 1, wherein the contents are a PTP packaging sheet on which a plurality of tablets are aligned.

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