Packaging

Abstract

To provide a packaging body with excellent unsealability.SOLUTION: The packaging body includes a first line of weakening provided on a storing portion formed on one film surface and a second line of weakening provided on a storing portion formed on the other film surface, and a notch, in which, when a reference line is a straight line extending from the notch in a second direction, the first line of weakening includes, in order from a first edge side, a first curved line portion that is convex from the reference line toward a third edge side, a second curved line portion that is connected to the first curved line portion on the reference line and is convex toward a fourth edge side from the reference line, and a straight line portion that is connected to the second curved line portion and extends in the second direction, the second line of weakening includes, starting from the notch side, a third curved line portion that has substantially the same shape as the first curved line portion in a plan view and overlaps with the first curved line portion, a fourth curved line portion that has substantially the same shape as the second curved line portion in a plan view and overlaps with the first curved line portion, and a fifth curved line portion that is connected to the fourth curved line portion and is convex from the reference line toward the fourth edge side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a package.

Background Art

[0002] There are known packages such as a three-sided sealed bag formed by folding a single rectangular laminated film in half and sealing the joined edges to form a storage portion, or a four-sided sealed bag formed by overlapping a pair of rectangular laminated films and then sealing the edges to form a storage portion.

[0003] Some of these packages have weakened lines formed to improve the opening property. For example, in the package described in Patent Document 1, a first tear-inducing weakened line is formed on the front film, and a second tear-inducing weakened line is formed on the back film. Since the breakage when opening the package proceeds along the first tear-inducing weakened line and the second tear-inducing weakened line, it can be performed at a position where breakage is intended. Further, the first tear-inducing weakened line and the second tear-inducing weakened line are formed such that the central portions are separated from each other in the vertical direction in a plan view of the package, and a difference in the tearing position can be created between the front film and the back film. Therefore, it becomes easy to separate the two films after breakage, and the opening / closing property can be improved.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when opening the package, there are cases where the break line deviates from the weakened line or the breakage does not reach the weakened line, and there has been room for consideration to surely reach the breakage to the weakened line.

[0006] This invention has been made in view of these problems, and aims to provide a package that is easy to open. [Means for solving the problem]

[0007] One aspect of the present invention for solving the above problems is a rectangular packaging body in which rectangular films are overlapped and a storage portion is formed by sealing at least the first edge, the second edge and the fourth edge of at least a first edge extending in a first direction, a second edge opposite to the first edge, a third edge adjacent to the first and second edges and extending in a second direction perpendicular to the first direction, and a fourth edge opposite to the third edge, wherein the packaging body has a first weakening line provided on the storage portion on one side of the film, which linearly weakens the strength, a second weakening line provided on the storage portion on the other side of the film, which linearly weakens the strength, and a notch formed on the third edge side of the first edge. The packaging body is such that, when a straight line extending from the notch in a second direction is used as the reference line, the first weakening line has, in order from the first edge side, a first curved section that is convex from the reference line toward the third edge side, a second curved section connected to the first curved section on the reference line and convex from the reference line toward the fourth edge side, and a straight section connected to the second curved section and extending in a second direction; the second weakening line has, in order from the notch side, a third curved section that is substantially the same shape as the first curved section in a plan view and overlaps with the first curved section, a fourth curved section that is substantially the same shape as the second curved section in a plan view and overlaps with the first curved section, and a fifth curved section connected to the fourth curved section and convex from the reference line toward the fourth edge. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a package that is easy to open. [Brief explanation of the drawing]

[0009] [Figure 1] Plan view and side view of a packaging body according to one embodiment of the present invention [Figure 2] Enlarged view of area A enclosed by the dotted line in Figure 1. [Modes for carrying out the invention]

[0010] A packaging body according to an embodiment of the present invention will be described with reference to the figures.

[0011] Figure 1 is a plan view and a side view of a packaging body 100 according to one embodiment of the present invention, and Figure 2 is an enlarged view of part A enclosed by a dotted line in Figure 1.

[0012] The packaging 100 is a four-sided sealed packaging body comprising a storage section 30 surrounded by a sealed section 20 formed by overlapping two rectangular films 10 and sealing each of the four edges 71 to 74 over a predetermined width. The packaging 100 has a first weakening line 41 and a second weakening line 42 on the storage section 30, which linearly weaken the strength of the two overlapping films 10, and a notch 51 formed on the first edge 71, which serves as a trigger to break the film 10 when opening the storage section 30. By using the notch 51 as a trigger to break the film 10 at least partially and form an opening in the packaging 100, the contents stored in the storage section 30 can be removed.

[0013] In the following, the edge on which the notch 51 is formed will be referred to as the first edge 71, the edge opposite the first edge 71 as the second edge 72, the edge adjacent to the first edge 71 that is closer to the notch 51 as the third edge 73, and the edge opposite the third edge 73 as the fourth edge 74. For convenience, as shown by the arrows in Figure 1, the direction extending in the direction of extension of the first edge 71 and toward the third edge 73 to the fourth edge 74 will be defined as the first direction, and the direction perpendicular to the first direction and toward the first edge 71 to the second edge 72 will be defined as the second direction.

[0014] (film) The film 10 is a film material formed in a rectangular shape and used to create a packaging body 100 having a storage section 30 by sealing its edges. The film 10 can preferably be a multilayer film of two or more layers, with a sealant layer in the innermost layer, for sealing the edges 71-74 by heat sealing or the like. Examples of materials for the layers constituting the film 10 include polyethylene terephthalate (PET), aluminum (AL), cellophane, polyethylene (PE), transparent vapor-deposited PET, and low-adsorption sealants (heat-sealable PET (HS-PET), cyclic polyolefin, EVOH sealant, etc.). In the case of a multilayer film, these can be used in appropriate combinations. The width of the film 10 in the second direction can be, for example, 150 mm.

[0015] The layer structure of the film 10 can be exemplified as follows. In the following structure, the layers are listed in order from the outermost layer to the innermost layer when the packaging 100 is formed. PET(12~15μm) / AL(7~20μm) / PE(20~50μm), PET(12μm) / AL(7~20μm) / HS-PET(20~50μm), PET(12μm) / AL(7~20μm) / PE(10~30μm) / PCO(10~30μm), Cellophane / AL (7-20 μm) / HS-PET (20-50 μm) Cellophane / AL (7-20 μm) / PE (10-30 μm) / PCO (10-30 μm) PET(12μm) / PE(10~30μm) / AL(7μm) / PE(10~40μm), Cellophane / PE (10-30 μm) / AL (7 μm) / PE (10-40 μm), In the above example, the first weakening line 41 and the second weakening line 42 can be formed in the outermost layer.

[0016] (notch) The notch 51 is a cut formed in the first edge 71 of the package 100. When opening the storage part 30, the user of the package 100 can start breaking the film 10 by using the notch 51 as a trigger. The notch 51 is formed by cutting the first edge 71 in a triangular shape over a predetermined length toward the opposing second edge 72. The shape of the notch 51 may be linear as long as it can trigger the breakage of the film 10, and a notch shape such as a pentagon can also be adopted.

[0017] (Weakening line) The first weakening line 41 and the second weakening line 42 are formed by linearly weakening the strength of each of the two overlapping films 10 in a predetermined positional relationship. The first weakening line 41 and the second weakening line 42 can be obtained, for example, by forming intermittent linear cuts (half cuts) in the film 10. In order to facilitate breakage, when the film 10 is a laminated film, it is preferable that the cuts are provided in the stretched base material layer that does not have cuttability excluding the aluminum layer. The first weakening line 41 and the second weakening line 42 can be formed by known methods such as a Thomson blade or a laser blade, or a carbon dioxide laser.

[0018] In FIGS. 1 and 2, the first weakening line 41 is shown as a solid line, and the second weakening line 42 is shown as a dotted line. The first weakening line 41 is formed in the film 10 on the front side of the paper surface in the plan view of FIG. 1, and the second weakening line 42 is formed in the film 10 on the back side of the paper surface in the plan view of FIG. 1. Although the first weakening line 41 and the second weakening line 42 are described with a shift for convenience, they are preferably formed so as to overlap in a plan view. As will be described later in detail, the package 100 can be opened by causing the breakage generated using the notch 51 to progress along the first weakening line 41 and the second weakening line 42. By separating the first weakening line 41 and the second weakening line 42 from the seal part 20 as shown in FIGS. 1 and 2, it is possible to suppress cracks from occurring in the aluminum layer of the film 10 due to impacts during transportation or the like.

[0019] The first weakened line 41 and the second weakened line 42 are obtained, for example, by forming intermittent linear cuts (half cuts) in the film 10. In order to facilitate breaking, when the film 10 is a laminated film, it is preferable that the cuts are provided in the stretched base material layer that does not have cuttability excluding the aluminum layer. The first weakened line 41 and the second weakened line 42 can be formed by known methods such as a blade type such as a Thomson blade or a laser blade, or a carbon dioxide laser. The half cut lines constituting the first weakened line 41 and the second weakened line 42 may be one or more, and may be double lines.

[0020] In the following description, a virtual straight line extending from the notch 51 in the second direction is referred to as a reference line 80.

[0021] The first weakened line 41 is formed in the film 10 on the front side of the paper surface in FIGS. 1 and 2, and includes a first curved portion 41a, a second curved portion 41b, and a straight portion 41c in order from the first edge 71 side. In FIG. 2, the boundaries of the first curved portion 41a, the second curved portion 41b, and the straight portion 41c are indicated by black circles.

[0022] The first curved portion 41a has a shape that is convex toward the third edge 73 side from the reference line 80, and the distance from the reference line 80 decreases as it approaches the second edge 72. The end (starting point) of the first curved portion 41a on the first edge 71 side is separated from the seal portion 20 by a predetermined distance, and it is possible to suppress cracks from occurring in the aluminum layer of the film 10 due to impacts during transportation or the like. Also, the end of the first curved portion 41a on the second edge 72 side is located on the reference line 80.

[0023] The second curved portion 41b is connected to the first curved portion 41a on the reference line 80. The second curved portion 41b has a shape that is convex toward the fourth edge 74 side from the reference line 80, and the distance from the reference line 80 increases as it approaches the second edge 72. The end (lowest point) of the second curved portion 41b on the second edge 72 side coincides with the point that is farthest from the third edge 73 of the first weakened line 41 in the first direction.

[0024] The straight section 41c is connected to the end (lowest point) of the second curved section 41b on the second edge 72 side and has a straight shape extending in the second direction. The length of the straight section 41c is not relevant as long as the end of the straight section 41c on the second edge 72 side is spaced apart from the seal section 20.

[0025] Furthermore, the second weakening line 42 is formed on the film 10 on the far side of the paper in Figures 1 and 2, and includes, in order from the first edge 71 side, a third curved section 42a, a fourth curved section 42b, a fifth curved section 42c, and a straight section 42d. In Figure 2, the boundaries of the third curved section 42a, the fourth curved section 42b, the fifth curved section 42c, and the straight section 42d are indicated by black circles.

[0026] The third curved section 42a has substantially the same shape as the first curved section 41a and is provided so as to overlap with the first curved section 41a in a plan view of the packaging 100. Specifically, the third curved section 42a has a shape that is convex toward the third edge 73 from the reference line 80, and the distance from the reference line 80 decreases as it approaches the second edge 72. The end (starting point) of the third curved section 42a on the first edge 71 side is set at a predetermined distance from the sealing section 20, which helps to suppress the occurrence of cracks in the aluminum layer of the film 10 due to impacts during transportation, etc. In addition, the end of the third curved section 42a on the second edge 72 side is located on the reference line 80.

[0027] The fourth curved section 42b has substantially the same shape as the second curved section 41b and is provided so as to overlap with the second curved section 41b in a plan view of the packaging 100. Specifically, the fourth curved section 42b is connected to the third curved section 42a on the reference line 80. The fourth curved section 42b has a shape that is convex toward the fourth edge 74 side from the reference line 80, and the distance from the reference line 80 increases as it approaches the second edge 72. The end (lowest point) of the fourth curved section 42b on the second edge 72 side coincides with the point furthest from the third edge 73 of the second weakening line 42 in the first direction.

[0028] The fifth curved section 42c is connected to the fourth curved section 42b. The fifth curved section 42c has a shape that is convex from the reference line 80 toward the fourth edge 74, and the distance from the reference line 80 decreases as it approaches the second edge 72. The end of the fifth curved section 42c on the second edge 72 side coincides with the reference line 80. The fifth curved section 42c may pass through the end (lowest point) of the fourth curved section 42b on the second edge 72 side and be provided symmetrically with respect to a straight line parallel to the first edge 71 with respect to the fourth curved section 42b.

[0029] The fifth curved section 42c may further have a shape that is convex toward the third edge 73 from the reference line 80. In this case, on the side of the second edge 72 from the intersection of the reference line 80 and the fifth curved section 42c, the distance from the reference line 80 increases as it approaches the second edge 72. In this case, the position of the end of the fifth curved section 42c on the second edge 72 side and the position of the end of the third curved section 42a on the first edge 71 side coincide in the first direction. The fifth curved section 42c may also be provided symmetrically with respect to a straight line that passes through the end (lowest point) of the fourth curved section 42b on the second edge 72 side and is parallel to the first edge 71, with respect to the third curved section 42a and the fourth curved section 42b. Furthermore, the end of the fifth curved section 42c on the second edge 72 side may be provided with a straight section 42d having a straight shape that extends in the second direction.

[0030] For ease of opening, it is preferable that the overlapping portions in a plan view (the first curved portion 41a and the second curved portion 41b, and the third curved portion 42a and the fourth curved portion 42b) coincide in a plan view, but a deviation of ±2 mm or less in the first and second directions is acceptable.

[0031] In this embodiment, the straight sections 41c and 42d are formed separated by a predetermined distance with respect to the first direction. Therefore, after opening, a difference in the cutting positions of the straight sections 41c and 42d occurs in a plan view. This difference allows the two films 10 to be easily separated from each other, and the opening formed by breaking the first weakening line 41 and the second weakening line 42 can be opened to a large size.

[0032] Furthermore, when the film 10 begins to break due to the notch 51, the break initially proceeds substantially along the reference line 80 extending from the notch 51 in a second direction, and then the break reaches the first weakening line 41 and the second weakening line 42. In this embodiment, the first weakening line 41 and the second weakening line 42 have width in the first direction, straddling the notch 51. Therefore, the break can be more reliably made to reach the first weakening line 41 and the second weakening line 42.

[0033] Furthermore, the first weakening line 41 and the second weakening line 42 are composed of curves at the points where fracture is expected to occur triggered by the notch 51 (first curved section 41a, second curved section 41b, third curved section 42a, and fourth curved section 42b). Therefore, when a fracture reaches the first weakening line 41 or the second weakening line 42, it is possible to suppress the fracture from intersecting the first weakening line 41 or the second weakening line 42 as it progresses, and to ensure that the fracture progresses more reliably along the first weakening line 41 or the second weakening line 42.

[0034] Furthermore, since the first curved section 41a, the second curved section 41b, the third curved section 42a, the fourth curved section 42b, and the fifth curved section 42c are all composed of curves, it is possible to suppress deviation from the weakening line when the fracture progresses from one curve to another. Also, when the fracture progresses from the second curved section 41b to the straight section 41c, it can progress smoothly.

[0035] Next, more preferred design conditions for the first weakening line 41 and the second weakening line 42 will be described. In the following description, the end of the first curved section 41a on the first edge 71 side is taken as the starting point, and the point of the second curved section 41b on the fourth edge 74 side is taken as the lowest point.

[0036] As shown in Figure 2, when the distance between the inner edge of the seal portion 20 of the first edge 71 in the second direction and the starting point is a, the distance between the starting point in the second direction and the lowest point is b, the distance between the starting point in the first direction and the lowest point is c, and the acute angle between the virtual straight line 81 extending in the second direction, passing through a point at a distance c / 2 from the starting point parallel to the first direction toward the fourth edge 74, and the tangent line L of the first weakening line 41 at the intersection of the virtual straight line 81 and the first weakening line 41, it is preferable that the following conditions are met. Note that the virtual straight line 81 and the reference line 80 may coincide. 1mm <a<15mm 1mm <b<45mm 1mm <c<15mm 0° <R<90°

[0037] As described above, in this embodiment, since the distance a is greater than 1 mm, the first weakening line 41 and the second weakening line 42 prevent a decrease in the strength of the first edge 71, and when forming the seal portion 20 using heat sealing, the tensile stress generated at the seal portion 20 side end of the housing portion 30 prevents the weakening line from partially breaking and causing minute cracks. Furthermore, since the predetermined distance a is less than 15 mm, the fracture triggered by the notch 51 can be reliably made to reach the first curved portion 41a and the third curved portion 42a.

[0038] Furthermore, because distance b is greater than 1 mm, the first curved section 41a and the second curved section 41b change abruptly with respect to the first direction, preventing the fracture from deviating from the first weakening line 41 and the second weakening line 42. In addition, because distance b is less than 45 mm, the fracture triggered by the notch 51 can quickly reach the first curved section 41a and the third curved section 42a.

[0039] Furthermore, if the distance c is greater than 1 mm, the first weakening line 41 and the second weakening line 42 have sufficient width in the first direction across the notch 51, making it possible to more reliably ensure that the fracture reaches the first weakening line 41 and the second weakening line 42. In addition, since the straight section 41c and the straight section 42d are sufficiently spaced apart with respect to the first direction, a difference can be created in the cutting position of the straight section 41c and the straight section 42d. Also, since the distance c is less than 15 mm, the minimum curvature of the first weakening line 41 and the second weakening line 42 can be increased, which can suppress the fracture from deviating from the first weakening line 41 and the second weakening line 42.

[0040] Furthermore, because the angle R is greater than 0°, the first curved section 41a and the second curved section 41b are gentle curves, which prevents the fracture from deviating from the first curved section 41a and the second curved section 41b. In addition, because the angle R is less than 90°, the first curved section 41a and the second curved section 41b, to which the fracture initiated by the notch 51 reaches, are not perpendicular to the fracture line. Therefore, when the fracture reaches the first curved section 41a and the second curved section 41b, it is possible to prevent the fracture from crossing the weakening line as it progresses.

[0041] Furthermore, by satisfying the above conditions, the first weakening line 41 and the second weakening line 42 become gentle curves except for the straight section 41c. Therefore, when the raw material of the film 10 is wound into a long roll, the first weakening line 41 and the second weakening line 42 are less likely to become rigid, and appearance defects can be suppressed.

[0042] (Function of weakening lines) In the packaging 100 equipped with a first weakening line 41 and a second weakening line 42, applying force to the notch 51 can initiate the rupture of the first edge 71, starting from the notch 51. By applying a shear force to the packaging 100 along the reference line 80 of the film 10, the rupture progresses from the first edge 71 toward the second direction. When the rupture progresses a predetermined distance from the first edge 71, it reaches the first curved section 41a and the third curved section 42a.

[0043] As force continues to be applied to the packaging 100, the fracture that reaches the first curved section 41a progresses along the first curved section 41a and then reaches the second curved section 41b. The fracture then progresses along the second curved section 41b and then reaches the lowest point. Similarly, the fracture that reaches the third curved section 42a progresses along the third curved section 42a and then reaches the fourth curved section 42b. The fracture then progresses along the fourth curved section 42b and then reaches the lowest point.

[0044] The fracture, having reached its lowest point, propagates along the straight section 41c and the fifth curved section 42c, separating in the first direction. As the fracture, which was propagating along the fifth curved section 42c, continues to propagate, it reaches the straight section 42d, forming a step difference corresponding to a distance c between the cut surface on the straight section 41c and the cut surface on the straight section 42d.

[0045] As a result, an opening surrounded by the cut surfaces of the first weakening line 41 and the second weakening line 42 is formed in the packaging 100. As described above, since the cut surface on the straight section 41c and the straight section 42d are formed at a predetermined distance c apart, a predetermined difference (distance between the cut lines) is formed in the first direction at the cutting positions of the two films 10 in a plan view. This difference allows the opening formed by pulling the two films 10 apart to be opened wide, making it easy to remove the contents.

[0046] In addition, although it was explained above that the fracture initiated by the notch 51 first reaches the first curved section 41a and the third curved section 42a, the fracture initiated by the notch 51 may also reach the second curved section 41b and the fourth curved section 42b. [Examples]

[0047] As examples and comparative examples, a package according to the first embodiment shown in Figure 1 was manufactured and its openability was evaluated. The film was composed of PET (12 μm) / PE (15 μm) / AL (7 μm) / PE (30 μm) from the outermost layer. The width of the manufactured package in the second direction was 150 mm, and the first and second weakening lines were formed by laser processing.

[0048] The manufactured packaging was opened by pulling it open using the first notch as a starting point, and evaluated for aluminum crack resistance, ease of opening, presence or absence of steps, suitability for long-length winding, and overall assessment. Table 1 shows the distance a, distance b, distance c, angle R, and evaluation results for each packaging for Examples 1-20 and Comparative Examples 1-15.

[0049] The "Aluminum Crack Resistance" item is marked with "×" if there is a risk of aluminum cracking, and "〇" otherwise.

[0050] For the "Openability" item, "○" indicates that the package could be opened along both the first and second weakening lines in all three packages; "△" indicates that there were instances where the package was opened off from both the first and second weakening lines; and "×" indicates that the package was opened off from both the first and second weakening lines in all cases.

[0051] The "Presence or Absence of Steps" item indicates whether a step was formed upon opening, whether it was formed but small, and whether it was not formed or the formed step was smaller than the set value.

[0052] The "Suitability for Long Rolls" item indicates that, for each of the three packaging materials, when a long roll of film of 500m or more was rolled, no defects in appearance occurred, with a "○" indicating that no defects originating from the first or second weakening lines were present; a "△" indicating that defects in appearance sometimes occurred; and a "×" indicating that defects in appearance occurred in all cases.

[0053] In the "Overall Evaluation" section, if any of the following items received an "×" rating: "Aluminum Crack Resistance," "Ease of Opening," or "Suitability for Long Rolls," it was marked "×." Otherwise, it was marked "〇." Among those with a "〇" rating, those that were particularly easy to open were marked "◎."

[0054] [Table 1]

[0055] In all of the packaging materials in Examples 1 to 20, the distance a exceeded 1 mm, thus reducing the likelihood of aluminum cracks occurring. Furthermore, because the distance a was less than 15 mm, the fracture initiated by the notch 51 was reliably able to reach the first curved section 41a and the third curved section 42a. In particular, the results from Examples 17 to 20 confirmed that if the distance a was less than 14 mm, the fracture could be more reliably brought to the first curved section 41a and the third curved section 42a.

[0056] Furthermore, in all of the packaging materials according to Examples 1 to 20, the distance b exceeded 1 mm, which prevented the rupture from deviating from the first weakening line 41 and the second weakening line 42. Also, because the distance b was less than 45 mm, the rupture triggered by the notch 51 could be quickly brought to the first curved section 41a and the third curved section 42a.

[0057] Furthermore, in all of the packaging materials according to Examples 1 to 20, the distance c exceeded 1 mm, so the first weakening line 41 and the second weakening line 42 had sufficient width in the first direction across the notch 51, making it possible to more reliably cause the break to reach the first weakening line 41 and the second weakening line 42. However, in Examples 7 and 13, the distance c was relatively small at 2 mm, resulting in a smaller step, which made it slightly more difficult to separate the two films compared to the other examples.

[0058] In addition, since all the packages according to Examples 1 to 20 satisfied the condition of 0° < R < 90°, the angles of the first curved portion 41a and the second curved portion 41b (the third curved portion 42a and the fourth curved portion 42b) with respect to the direction of breakage progression starting from the notch 51 were gentle. Therefore, it was possible to suppress the deviation of the breakage progression from the first weakened line 41 and the second weakened line 42. However, in Example 16, since the angle R was 85° and the angles of the first curved portion 41a and the second curved portion 41b (the third curved portion 42a and the fourth curved portion 42b) with respect to the direction of breakage progression were steep, the breakage might sometimes cross the first weakened line 41 and the second weakened line 42 and progress.

[0059] In addition, for the packages according to Examples 1 to 20, the distance c was 1 mm or more, and since a curve was formed in the weakened line, it was difficult to form burrs even in long-strip winding, and appearance defects were unlikely to occur. However, in Examples 7 and 13, the distance c was relatively small, 2 mm or less, and the weakened line became nearly straight, so appearance defects might occur in long-strip winding.

[0060] In Comparative Example 1, since the distance a was 1 mm or less, there was a risk of aluminum cracking, and the breakage starting from the notch 51 might sometimes cross the weakened line.

[0061] In Comparative Example 2, since the distance c was 1 mm or less, the first weakened line 41 and the second weakened line 42 did not ensure sufficient width in the first direction across the notch 51, and the breakage might sometimes not reach the first weakened line 41 and the second weakened line 42. In addition, since the weakened line became nearly straight, appearance defects occurred in long-strip winding, and no step was formed.

[0062] In Comparative Example 3, since distance a was 1 mm or less, there was a risk of aluminum cracks occurring, and in some cases, fractures initiated at notch 51 may have gone beyond the weakening line. Also, since distance b was 1 mm or less, fractures may have deviated from the first weakening line 41 and the second weakening line 42. Furthermore, since distance c was 1 mm or less, the first weakening line 41 and the second weakening line 42 did not have sufficient width in the first direction across notch 51, and in some cases, fractures could not reach the first weakening line 41 and the second weakening line 42. In addition, because the weakening line became nearly straight, an appearance defect occurred in long-length windings, and no steps were formed.

[0063] Furthermore, in Comparative Example 4, since the distance c was 1 mm or less, the first weakening wire 41 and the second weakening wire 42 did not have sufficient width in the first direction across the notch 51, and in some cases, the break could not reach the first weakening wire 41 and the second weakening wire 42. In addition, because the weakening wire became nearly straight, an appearance defect occurred in the long-length winding, and no steps were formed.

[0064] Furthermore, in Comparative Example 5, since the distance c exceeded 15 mm, the fracture sometimes deviated from the first weakening line 41 and the second weakening line 42.

[0065] In Comparative Example 6, since the distance b was 1 mm or less, the fracture sometimes deviated from the first weakening line 41 and the second weakening line 42.

[0066] In Comparative Example 7, because the distance b was 45 mm or more, the fracture triggered by notch 51 could not be quickly brought to the first curved section 41a and the third curved section 42a, and as a result, a step could not be formed.

[0067] In Comparative Example 8, since the distance a was 15 or more, the fracture triggered by the notch 51 may not reach the first curved section 41a and the third curved section 42a, and as a result, a step may not be formed.

[0068] In Comparative Example 9, since the distance a was 15 or more, the fracture triggered by the notch 51 sometimes did not reach the first curved section 41a and the third curved section 42a, and as a result, a step could not be formed. Also, since the distance c was greater than 15 mm, the fracture sometimes deviated from the first weakening line 41 and the second weakening line 42.

[0069] In Comparative Example 10, since distance a was 15 mm or more, the fracture triggered by the notch 51 may not reach the first curved section 41a and the third curved section 42a, and as a result, a step may not be formed. Also, since distance b was 45 mm or more, the fracture triggered by the notch 51 may not be able to quickly reach the first curved section 41a and the third curved section 42a, and as a result, a step may not be formed. Also, since distance c was greater than 15 mm, the fracture may deviate from the first weakening line 41 and the second weakening line 42.

[0070] In comparative examples 11, 12, and 14, the angle R was 90° or greater, so when the fracture reached the first curved section 41a and the third curved section 42a, the fracture sometimes went beyond the weakening line. In addition, the first weakening line 41 and the second weakening line 42 did not form a gentle curve, resulting in an appearance defect in long-length rolls.

[0071] In comparative examples 13 and 15, because the angle R was 0°, the fracture progression sometimes deviated from the first curved section 41a and the third curved section 42a. In addition, the first weakening line 41 and the second weakening line 42 did not form gentle curves, resulting in an appearance defect in long-length windings. [Industrial applicability]

[0072] The present invention can be suitably used for packaging sheet-like contents such as transdermal tapes and patches for administering drugs transdermally. [Explanation of symbols]

[0073] 100 packages 10 films 20 Seal part 30 Storage Units 41. First weakening line 41a First curved section 41b First curved section 41c Straight section 42. Second weakening line 42a Third curved section 42b Fourth curved section 42c Fifth curved section 42d Straight section 51 Notches 71 First edge 72 Second edge 73 Third edge 74. Fourth edge 80 Baseline

Claims

1. A rectangular packaging body is formed by overlapping rectangular films and sealing at least the first edge, the second edge, and the fourth edge of at least the first edge extending in a first direction, the second edge facing the first edge, the third edge adjacent to the first and second edges and extending in a second direction perpendicular to the first direction, and the fourth edge facing the third edge, to form a storage portion. The aforementioned packaging body is A first weakening line is provided on the housing portion of one of the films, which linearly weakens the strength of the film. A second weakening line is provided on the other side of the film, which linearly weakens the strength of the film, It has a notch formed on the third edge side of the first edge, When a straight line extending from the notch in the second direction is used as the reference line, The first weakening line is drawn sequentially from the first edge side, A first curved portion that is convex toward the third edge side from the reference line, A second curved section is connected to the first curved section on the reference line and is convex toward the fourth edge side from the reference line, It has a straight section connected to the second curved section and extending in the second direction, The second weakening line is, in order from the notch side, A third curved portion has substantially the same shape as the first curved portion in a plan view and overlaps with the first curved portion, A fourth curved portion has substantially the same shape as the second curved portion in a plan view and overlaps with the first curved portion, A packaging body having a fifth curved portion connected to the fourth curved portion and convex toward the fourth edge from the reference line.

2. The end of the first curved section is taken as the starting point, and the point closest to the fourth edge of the second curved section is taken as the lowest point. The distance between the inner edge of the sealing portion of the first edge in the second direction and the starting point is a, The distance between the starting point and the lowest point in the second direction is b. The distance between the starting point and the lowest point in the first direction is c. When R is the acute angle formed by a virtual straight line extending from the starting point parallel to the first direction, passing through a point c / 2 away from the fourth edge side, and extending in the second direction, and the tangent line to the first weakening line at the intersection of the virtual straight line and the first weakening line, 1mm<a<15mm 1mm<b<45mm 1mm<c<15mm 0° < R < 90° A packaging body according to claim 1 that satisfies the conditions.

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