Patent Publication Number: US-11390441-B2

Title: Packaging bag

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS 
     This application is a continuation application filed under 35 U.S.C. § 111(a) claiming the benefit under 35 U.S.C. §§ 120 and 365(c) of International Patent Application No. PCT/JP2018/022437, filed on Jun. 12, 2018, which is based upon and claims the benefit of priority to Japanese Patent Application No. 2017-118741, filed on Jun. 16, 2017; Japanese Patent Application No. 2017-118742, filed on Jun. 16, 2017; and Japanese Patent Application No. 2017-118743, filed on Jun. 16, 2017; the disclosures of which are all incorporated herein by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a packaging bag. 
     BACKGROUND ART 
     Three-sided seal bags or four-sided seal bags are well known. The three-sided seal bags are formed by folding one laminated rectangular film in half and sealing the overlapped edges with each other to provide a container part. The four-sided seal bags are formed by overlapping a pair of laminated rectangular films with each other and sealing (heat-sealing) the edges to provide a container part. 
     PTL 1 discloses a rectangular packaging bag (four-sided seal bag) in which score lines (opening lines) where strength is reduced are formed on the front and back laminated films. The score lines are formed such as by half-cutting so as to respectively extend parallel to two adjacent edges among the four edges. This packaging bag can package sheet-shaped contents, such as a medical tape or a patch, for transdermal administration of medication. 
     The user of this packaging bag firstly breaks the laminated films from a start notch formed at an edge of the packaging bag along a score line until the break reaches the opposite end. Then, the user of the packaging bag breaks the laminated films from a start notch formed at another edge of the packaging bag along another score line until the break reaches the opposite end. As a result, an opening is formed in the packaging bag, being defined by the break lines which are formed along the two score lines. Since a large opening is provided, the user of the packaging bag can easily remove the contents from the opening. 
     [Citation List] [Patent Literature] PTL 1: WO 2015/105101-A1 
     SUMMARY OF THE INVENTION 
     Technical Problem 
     Such packaging bags are used for various purposes. However, no sufficient studies have been made for suitably usable shapes of the score lines. 
     The present invention has been made in light of such an issue and aims to provide a packaging bag which is provided with a score line that can be suitably used. 
     Solution to Problem 
     To solve the issue set forth above, an aspect of the present invention is a packaging bag having a rectangular shape formed by overlapping film sheets and sealing at least three edges thereof to form a container part. In the packaging bag, a score line, in which the strength of the films is reduced, is formed on the container part away from the seal part in plan view. 
     Advantageous Effects of the Invention 
     The present invention can provide a packaging bag that can be suitably used with provision of a score line. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a set of diagrams, i.e., a plan view and a side view, illustrating a packaging bag according to a first embodiment of the present invention. 
         FIG. 2  is a diagram illustrating the position for forming a score line. 
         FIG. 3  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 4  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 5  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 6  is a set of diagrams, i.e., a plan view and a side view, illustrating a packaging bag according to a second embodiment of the present invention. 
         FIG. 7  is a diagram illustrating the position for forming a score line. 
         FIG. 8  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 9  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 10  is a set of diagrams, i.e., a plan view and a side view, illustrating a packaging bag according to a third embodiment of the present invention. 
         FIG. 11  is a diagram illustrating the position for forming a score line. 
         FIG. 12  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 13  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 14  is a plan view illustrating a packaging bag according to a modification of the present invention. 
         FIG. 15  is a plan view illustrating a packaging bag according to a mode in which a score line is provided on a seal part. 
         FIG. 16  is a plan view illustrating a packaging bag according to a mode in which a score line is provided on a seal part. 
         FIG. 17  is a plan view illustrating a packaging bag according to a mode in which a score line is provided on a seal part. 
         FIG. 18  is a plan view illustrating a packaging bag according to a mode in which a score line is provided on a seal part. 
         FIG. 19  is a plan view illustrating a packaging bag according to a mode in which a score line is provided on a seal part. 
     
    
    
     DETAILED DESCRIPTION 
     With reference to the accompanying Figures, a description will now be given of representative embodiments according to the present invention. The present invention is not limited to the following representative embodiments, and appropriate modifications can be made without departing from the spirit of the present invention. The representative embodiments described below are merely examples of the present invention, and the design thereof could be appropriately changed by one skilled in the art. Here, the drawings are schematic, and the relationship between thickness and plane size, the ratio of the thickness of each layer, etc., may be different from actual ones. The embodiments described below are merely examples of the configurations for embodying the technical idea of the present invention, and the technical idea of the present invention should not limit the materials, shapes, structures, and the like of the components to those described below. The technical idea of the present invention can be modified in various ways within the technical scope specified by the claims. 
     The same constituent elements are denoted by the same reference numerals unless there is a reason for the sake of convenience, and redundant description is omitted. In the drawings referred to in the following description, for clarity, characteristic parts are enlarged, and thus the components are not shown to scale. It is, however, clear that one or more embodiments can be implemented without such details. In addition, known structures and devices may be schematically represented for simplicity. 
     First Embodiment 
       FIG. 1  is a set of diagrams, i.e., a plan view and a side view, illustrating a packaging bag  100  according to a first embodiment of the present invention. The packaging bag  100  is formed of two rectangular films  10  overlapped with each other, and includes a seal part  20  and a container part  30 . The seal part  20  is formed by sealing four edges  71  to  74  of the overlapped films  10 . The container part  30  is a portion surrounded by the seal part  20 . The packaging bag  100  further includes a first score line  41  and a second score line  42 , and a first notch  51  and a second notch  52 . The first and second score lines  41  and  42  are formed at least on the container part  30  to reduce the strength of the films  10 . The first and second notches  51  and  52  are respectively formed on any two of the edges  71  to  74  to serve as start points for breaking the films  10  when the container part  30  is to be opened. 
     In the following description, the edge in which the first notch  51  is formed is referred to as a first edge  71 , the edge which faces the first edge  71  is referred to as a second edge  72 , and, of the edges adjacent to the first edge  71 , the edge near the first notch  51  is referred to as a third edge  73 , and the edge which faces the third edge  73  is referred to as a fourth edge  74 . 
     (Films) 
     The films  10  each have a rectangular shape. By sealing the edges  71  to  74  of the films  10 , a packaging bag  100  having a container part  30  can be provided. As the films  10 , multilayer films may be suitably used. To seal the edges  71  to  74  of the films such as by heat sealing, the multilayer films may each include two or more layers including a sealant layer as an innermost layer. For example, materials that can be used for the layer of each film  10  include polyethylene terephthalate (PET), aluminum (AL), cellophane, polyethylene (PE), transparent deposition PET, and low adsorption sealant (PET having heat-sealing properties, cyclic polyolefin, EVOH sealant or the like). In the case of a multilayer film, these materials may be combined as appropriate. 
     (Notches) 
     The first and second notches  51  and  52  are formed in the edges  71  to  74  of the packaging bag  100 . When opening the container part  30 , the user of the packaging bag  100  can break the films  10  using the first and second notches  51  and  52  as start points. As shown in FIG.  1 , the packaging bag  100  includes the first notch  51  formed in the first edge  71 , and the second notch  52  formed in the fourth edge  74 . The first and second notches  51  and  52  are formed by cutting the seal part  20  in a line over a predetermined length toward corresponding ones of the facing edges  71  to  74 . As long as the first and second notches  51  and  52  can serve as start points for breaking the films  10 , the shape of them is not limited to a linear shape but may be a triangular or pentagonal shape, or other shapes. 
     (Score Lines) 
     The first and second score lines  41  and  42  are portions in which the strength of the films  10  is reduced in a line. The first score line  41  can guide the break line starting from the first notch  51  to the vicinity of the seal part  20  where there is the second edge  72  facing the first edge  71 . The second score line  42  can guide the break line started from the second notch  52  to the vicinity of the seal part  20  where there is the third edge  73  facing the fourth edge  74 . 
     In the packaging bag  100 , the first and second score lines  41  and  42  are formed on both of the two films  10  so that those in one film  10  respectively align with those in the other film  10  in plan view when the films  10  are formed into the packaging bag  100 . However, the first and second score lines  41  and  42  may be formed on either one of the two films  10 . 
     As shown in  FIG. 1 , the first and second score lines  41  and  42  are formed on the container part  30  away from the seal part  20  in plan view. The first and second score lines  41  and  42  are formed on phantom straight lines (not shown) respectively extending from the first and second notches  51  and  52  in directions perpendicular to the first and fourth edges  71  and  74 . 
       FIG. 2  is an enlarged view of the packaging bag  100  illustrating the position for forming a score line, taking the first score line  41  as an example. There is a distance La between an end of the first score line  41  and an inner edge  21  of the seal part. The distance La is preferred to be larger. Specifically, the distance La may preferably be 1 mm or more. When the distance La is 1 mm or more, the first score line  41  should not be formed near the inner edge  21  of the seal part. Accordingly, stress is prevented from concentrating on the film  10  near the inner edge  21  of the seal part. As a result, the occurrence of microcracks is minimized in the film  10  near the inner edge  21  of the seal part. In particular, when the film  10  is a multilayer film including an aluminum layer that easily suffers microcracks, loss of barrier performance, which would otherwise occur in the packaging bag  100  due to the occurrence of microcracks in the aluminum layer, can be suitably prevented. 
     The first and second score lines  41  and  42  can be obtained by forming intermittent linear cuts (half-cuts) in each film  10 . When the film  10  is a laminated film, the first and second score lines  41  and  42  may be formed by forming cuts only through the outermost layer of the laminated film. A known method, such as a method using a Thomson blade or a razor blade, or a method using a carbon dioxide laser, may be used for forming the first and second score lines  41  and  42 . 
     (Modifications) 
     The first and second score lines  41  and  42  may be curves instead of straight lines.  FIG. 3  shows a packaging bag  101  according to a modification in which the first and second score lines  41  and  42  are formed into curves. 
     As long as the first and second score lines  41  and  42  can reduce the strength of the films  10  in a line, the shape of them is not limited to perforations which are structured by intermittent cuts.  FIG. 4  shows a packaging bag  102  according to a modification in which the first and second score lines  41  and  42  are each formed of two parallel straight lines each of which is formed of intermittent linear half-cuts.  FIG. 5  shows a packaging bag  103  according to a modification in which the first and second score lines  41  and  42  are each formed as perforations in the shape of the kanji character for eight. Specifically, in the perforations, pairs of fine cuts, each pair forming the kanji character for eight (pairs each structured by non-parallel linear cuts facing each other), are arranged in a line. Besides these shapes, the first and second score lines  41  and  42  may each be a straight line or multiple parallel straight lines, or may have other shapes. 
     The packaging bag  100  is a four-sided seal bag. However, as long as the packaging bag is a rectangular packaging bag having a container part that is formed by sealing at least three edges, the packaging bag is not limited to a four-sided seal bag. For example, the packaging bag may be a three-sided seal bag formed by folding one laminated rectangular film in half and sealing the overlapped edges with each other. Alternatively, the packaging bag may be a four-sided seal bag formed by folding one laminated rectangular film in half to provide four edges. 
     In the packaging bag  100 , one first score line  41  and one second score line  42  are formed. However, either one of them may be formed. 
     Second Embodiment 
       FIG. 6  is a set of diagrams, i.e., a plan view and a side view, illustrating a packaging bag  200  according to a second embodiment of the present invention. The packaging bag  200  is formed of two rectangular films  10  overlapped with each other, and includes a seal part  20  and a container part  30 . The seal part  20  is formed by sealing four edges  71  to  74  of the films  10 . The container part  30  is a portion surrounded by the seal part  20 . The packaging bag  200  further includes a first score line  41  and a second score line  42 , and a first notch  51  and a second notch  52 . The first and second score lines  41  and  42  are formed at least on the container part  30  to reduce the strength of the films  10 . The first and second notches  51  and  52  are respectively formed on any two of the edges  71  to  74  to serve as start points for breaking the films  10  when the container part  30  is to be opened. The packaging bat  200  is different from the packaging bag  100  in the shape of the score lines. 
     (Score Lines) 
     The first and second score lines  41  and  42  are portions in which the strength of the films  10  is reduced in a line. The first score line  41  can prevent the break line from reaching the third edge  73  which is an edge near the first notch  51  among the edges adjacent to the first edge  71 . The second score line  42  can prevent the break line from reaching the second edge  72  which is an edge near the second notch  52  among the edges adjacent to the fourth edge  74 . 
     In the packaging bag  200 , the first and second score lines  41  and  42  are formed on both of the two films  10  so that those in one film  10  respectively align with those in the other film  10  in plan view when the films  10  are formed into the packaging bag  200 . However, the first and second score lines  41  and  42  may be formed on either one of the two films  10 . 
     As shown in  FIG. 6 , the first and second score lines  41  and  42  are formed on the container part  30  away from the seal part  20  in plan view. The first score line  41  is formed so as to pass through an area sandwiched between a phantom first straight line  61  and the third edge  73 . The phantom first straight line  61  extends from the first notch  51  to the second edge  72  in a direction perpendicular to the first edge  71 . The third edge  73  is an edge near the first notch  51  among the edges adjacent to the first edge  71 . More specifically, the first score line  41  is structured by a first curve and a second curve. The first curve extends from the vicinity of the first edge  71  toward the second edge  72  so as to approach the third edge  73  and intersects the phantom first straight line  61  extending from the first notch  51  to the second edge  72  in a direction perpendicular to the first edge  71 . The second curve extends from a second edge  72  side end of the first curve toward the second edge  72  so as to be substantially parallel to the third edge  73 . 
     The second score line  42  is formed so as to pass through an area sandwiched between a phantom second straight line  62  and the second edge  72 . The second phantom straight line  62  extends from the second notch  52  to the third edge  73  in a direction perpendicular to the third edge  73 . More specifically, the second score line  42  is structured by a first curve and a second curve. The first curve extends from the vicinity of the fourth edge  74  toward the third edge  73  so as to approach the second edge  72  and intersects the phantom second straight line  62  extending from the second notch  52  to the third edge  73  in a direction perpendicular to the third edge  73 . The second curve extends from a third edge  73  end of the first curve toward the third edge  73  so as to be substantially parallel to the second edge  72 . 
       FIG. 7  is an enlarged view of the packaging bag  200  illustrating the position for forming a score line, taking the first score line  41  as an example. It is preferred that the first score line  41  has two ends having respective distances (La 1 , La 2 ) of 1 mm or more from the first straight line  61 . By forming the first score line  41  in this way, the first score line  41  can be imparted with an allowable angular range as viewed from the first notch  51 . Accordingly, even when the break line is not parallel to the first straight line  61  and directed to the third or fourth edge  73  or  74 , the break line can reach the first score line  41  and can be further guided toward the second edge  72 . 
     The first and second score lines  41  and  42  can be obtained by forming intermittent linear cuts (half-cuts) in each film  10 . When the film  10  is a laminated film, the first and second score lines  41  and  42  may be formed by forming cuts only through the outermost layer of the laminated film. A known method, such as a method using a Thomson blade or a razor blade, or a method using a carbon dioxide laser, may be used for forming the first and second score lines  41  and  42 . 
     (Functions of the Score Lines) 
     When the first and second score lines  41  and  42  of the packaging bag  200  are formed so as to have portions respectively intersecting the first and second straight lines  61  and  62 , the break line that has been started from the first notch  51  or the second notch  52 , even when the direction of the break line is not parallel to the first straight line  61  or the second straight line  62 , can smoothly reach the first score line  41  or the second score line  42 . 
     The break line that has reached the first score line  41  or the second score line  42  advances along the first score line  41  or the second score line  42 . The first score line  41  is formed extending toward the second edge  72 . The second score line  42  is formed extending toward the third edge  73 . Therefore, the break line that has reached the first score line  41  or the second score line  42  can advance to the vicinity of the second edge  72  or the third edge  73  along the first score line  41  or the second score line  42 . 
     As described above, due to provision of the first score line  41 , the packaging bag  200  can prevent the break line started from the first notch  51  from reaching the third edge  73  or the fourth edge  74  and can guide the break line to the vicinity of the second edge  72 . Similarly, due to provision of the second score line  42 , the packaging bag  200  can prevent the break line started from the second notch  52  from reaching the first edge  71  or the second edge  72  and can guide the break line to the vicinity of the third edge  73 . Thus, the packaging bag  200  can minimize possible failure in opening which would otherwise occur due to the break line not reaching the edge which faces the first notch  51  or the second notch  52 , while minimizing the occurrence of microcracks in the films  10 . Furthermore, due to provision of the first and second score lines  41  and  42  for the first and second notches  51  and  52  respectively, openability in two directions can be improved. 
     The first and second score lines  41  and  42  of the packaging bag  200  are formed so as to respectively intersect the first and second straight lines  61  and  62 . Thus, the first notch  51  and second notch  52  each have an allowable angular range in terms of the direction of forming the break line as viewed from the first notch  51 . Accordingly, the ranges of forming the first and second notches  51  and  52  can be imparted with margins in the respective first and fourth edges  71  and  74 . Therefore, compared to the conventional art in which notches have been formed so as to abut with the ends of the respective score lines, accuracy in the position of forming the notches can be alleviated. 
     (Modifications) 
     The first and second score lines  41  and  42  may be straight lines instead of moderate curves.  FIG. 8  shows a packaging bag  201  according to a modification in which the first and second score lines  41  and  42  are formed into straight lines. 
     As long as the first and second score lines  41  and  42  can reduce the strength of the films  10  in a line, the shape of them is not limited to perforations which are structured by intermittent cuts.  FIG. 9  shows a packaging bag  202  according to a modification in which the first and second score lines  41  and  42  are each formed as perforations in the shape of the kanji character for eight. Specifically, in the perforations, pairs of fine cuts, each pair forming the kanji character for eight (pairs each structured by non-parallel linear cuts facing each other), are linearly arranged. Besides these shapes, the first and second score lines  41  and  42  may each be a straight line or multiple parallel straight lines, or may have other shapes. 
     In the packaging bag  200 , one first score line  41  and one second score line  42  are formed. However, either one of them may be formed. 
     Third Embodiment 
       FIG. 10  is a set of diagrams, i.e., a plan view and a side view, illustrating a packaging bag  300  according to a third embodiment of the present invention. The packaging bag  300  is formed of two rectangular films  10  overlapped with each other, and includes a seal part  20  and a container part  30 . The seal part  20  is formed by sealing four edges  71  to  74  of the films  10 . The container part  30  is a portion surrounded by the seal part  20 . The packaging bag  300  further includes a first score line  41  and a second score line  42 , a first auxiliary score line  81  and a second auxiliary score line  82 , and a first notch  51  and a second notch  52 . The first and second score lines  41  and  42  are formed at least on the container part  30  to reduce the strength of the films  10 . The first and second notches  51  and  52  are respectively formed on any two of the edges  71  to  74  to serve as start points for breaking the films  10  when the container part  30  is to be opened. The packaging bag  300  is different from the packaging bag  100  in the positions of forming the first and second score lines  41  and  42  and the presence or absence of the first and second auxiliary score lines  81  and  82 . 
     (Score Lines) 
     The first and second score lines  41  and  42  are portions in which the strength of the films  10  is reduced in a line. The first score line  41  can prevent the break line from reaching the third edge  73  which is an edge near the first notch  51  among the edges adjacent to the first edge  71 . The second score line  42  can prevent the break line from reaching the second edge  72  which is an edge near the second notch  52  among the edges adjacent to the fourth edge  74 . 
     In the packaging bag  300 , the first and second score lines  41  and  42  are formed on both of the two films  10  so that those in one film  10  respectively align with those in the other film  10  in plan view when the films  10  are formed into the packaging bag  300 . However, the first and second score lines  41  and  42  may be formed on either one of the two films  10 . 
     As shown in  FIG. 10 , the first and second score lines  41  and  42 , and the first and second auxiliary score lines  81  and  82  are formed on the container part  30  away from the seal part  20  in plan view. The first score line  41  is formed so as to pass through an area sandwiched between a first phantom straight line  61  and the third edge  73 . The phantom first straight line  61  extends from the first notch  51  to the second edge  72  in a direction perpendicular to the first edge  71 . The third edge  73  is an edge near the first notch  51  among the edges adjacent to the first edge  71 . 
     The second score line  42  is formed so as to pass through an area sandwiched between a phantom second straight line  62  and the second edge  72 . The second phantom straight line  62  extends from the second notch  52  to the third edge  73  in a direction perpendicular to the fourth edge  74 . 
       FIG. 11  is an enlarged view of the packaging bag  300  illustrating the position for forming a score line, taking the first score line  41  as an example. It is preferred that a minimum value (La 3 ) of the distance between the first score line  41  and the first straight line  61  is 1 mm or more. 
     (Auxiliary Score Lines) 
     Similar to the first and second score lines  41  and  42 , the first and second auxiliary score lines  81  and  82  are portions in which the strength of the films  10  is reduced in a line. The first and second auxiliary score lines  81  and  82  can prevent the break line started from the first notch  51  from reaching the fourth edge  74  and can prevent the break line started from the second notch  52  from reaching the first edge  71 . 
     As shown in  FIG. 10 , the first auxiliary score line  81  is formed along a straight line intersecting the first straight line  61  and extending from an opposite side of the third edge  73  over the first notch  51  of the first edge  71  and connected to the first score line  41 . 
     The second auxiliary score line  82  is formed along a straight line intersecting the second straight line  62  and extending from a first edge  71  side position relative to the second notch  52  of the fourth edge  74  and connected to the second score line  42 . 
     The first and second score lines  41  and  42 , and the first and second auxiliary score lines  81  and  82  can be obtained by forming intermittent linear cuts (half-cuts) in each film  10 . When the film  10  is a laminated film, the first and second score lines  41  and  42 , and the first and second auxiliary score lines  81  and  82  may be formed by forming cuts only through the outermost layer of the laminated film. A known method, such as a method using a Thomson blade or a razor blade, or a method using a carbon dioxide laser, may be used for forming the first and second score lines  41  and  42 , and the first and second auxiliary score lines  81  and  82 . 
     (Functions of the score lines) 
     Thus, provision of the first and second score lines  41  and  42  to the packaging bag  100  enables the break line that is started from the first notch  51  or the second notch  52  to reach the first score line  41  or the second score line  42  if the break line is directed to the third edge  73  or the second edge  72  instead of being directed to the facing edge. Furthermore, provision of the first and second auxiliary score lines  1  and  2  can prevent the break line started from the first notch  51  from reaching the fourth edge  74 , and can prevent the break line started from the second notch  52  from reaching the first edge  71 . 
     The break line that has reached the first score line  41  or the second score line  42  advances along the first score line  41  or the second score line  42 . The first score line  41  is formed extending from the vicinity of the first edge  71  toward the second edge  72 . The second score line  42  is formed extending from the vicinity of the fourth edge  74  toward the third edge  73 . Therefore, the break line that has reached the first score line  41  or the second score line  42  can advance to the second edge  72  or the third edge  73 , which faces the edge where the first notch  51  or the second notch  52  is formed, along the first score line  41  or the second score line  42 . 
     As described above, due to provision of the first score line  41 , the packaging bag  300  can prevent the break line started from the first notch  51  from reaching the third edge  73  and can guide the break line so as to reach the second edge  72 . Similarly, due to provision of the second score line  42 , the packaging bag  300  can prevent the break line started from the second notch  52  from reaching the second edge  72  and can guide the break line so as to reach the third edge  73 . Thus, the packaging bag  300  can minimize failure in opening which would otherwise occur due to the break line not reaching the edge which faces the first notch  51  or the second notch, while minimizing the occurrence of microcracks in the films  10 . Furthermore, due to provision of the first and second score lines  41  and  42  for the first and second notches  51  and  52  respectively, openability in two directions can be improved. In other words, the packaging bag  300  can also achieve advantageous effects similar to those of the packaging bags  100  and  200 . 
     Since the first and second score lines  41  and  42  are formed so as to be respectively away from the first and second straight lines  61  and  62  by 1 mm or more, the break line is prevented from passing across the first score line  41  or the second score line  42  caused by momentum when breaking of the films  10  is started from the first notch  51  or the second notch  52  as a start point. 
     (Modifications) 
     The first and second score lines  41  and  42  may be curves instead of straight lines.  FIG. 12  shows a packaging bag  301  according to a modification in which the first and second score lines  41  and  42  are formed into curves. 
     As long as the first and second score lines  41  and  42  can reduce the strength of the films  10  in a line, the shape of them is not limited to perforations which are structured by intermittent cuts.  FIG. 13  shows a packaging bag  302  according to a modification in which the first and second score lines  41  and  42  are each formed of two parallel straight lines each of which is formed of intermittent linear half-cuts.  FIG. 14  shows a packaging bag  303  according to a modification in which the first and second score lines  41  and  42  are each formed as perforations in the shape of the kanji character for eight. Specifically, in the perforations, pairs of fine cuts, each pair forming the kanji character for eight (pairs each structured by non-parallel linear cuts facing each other), are arranged in a line. Besides these shapes, the first and second score lines  41  and  42  may each be a straight line or multiple parallel straight lines, or may have other shapes. 
     In the packaging bag  300 , one first score line  41  and one second score line  42  are formed. However, either one of them may be formed. The first and second auxiliary score lines  81  and  82  are not necessarily required. 
     The above description has dealt with packaging bags which are capable of preventing or reducing loss of barrier properties due to possible occurrence of microcracks. However, as shown in  FIGS. 15 to 19 , if packaging bags are not required to have barrier properties, a first score line  41 ′, a second score line  42 ′, a first auxiliary score line  81 ′ and a second auxiliary score line  82 ′ may be formed so as to extend onto the seal part  20 .  FIGS. 15 to 19  respectively show packaging bags  901  to  905  each provided with such first and second score lines  41 ′ and  42 ′, and first and second auxiliary score lines  81 ′ and  82 ′. 
     EXAMPLES 
     Examples Related to the First Embodiment 
     Packaging bags for examples and comparative examples were prepared and the occurrence of microcracks in the aluminum layer of each packaging bag was examined. The packaging bags of the examples were each prepared by changing the position (distance La) and the shape of the score lines of the packaging bag  100  shown in  FIG. 1 . The packaging bags of the comparative examples were each formed so that the score lines of the packaging bag  100  abutted with the seal part. In all the examples and the comparative examples, two score lines (first and second score lines) were formed similarly to the packaging bag  100  so as to be symmetrical about the diagonal line drawn from the corner where the two edges respectively provided with the two notches abutted with each other. 
     For each of the examples and the comparative examples, packaging bags respectively using the films having the following layer structures from the outermost layer to the innermost layer were prepared. 
     (1) Polyethylene terephthalate (PET) (12 μm)/aluminum (AL) (7 μm)/PET having heat-sealing properties (20 μm to 50 μm) 
     (2) Cellophane (#300 to #500)/AL (7 μm)/PET having heat-sealing properties (20 μm to 50 μm) 
     (3) PET (12 μm)/AL (9 μm)/polyethylene (PE) (20 μm to 50 μm) 
     (4) PET (12 μm)/PE (10 μm to 30 μm)/AL (7 μm)/PE (10 μm to 40 μm) 
     (5) Cellophane (#300 to #500)/PE (10 μm to 30 μm)/AL (7 μm)/PE (10 μm to 40 μm) 
     The above films were each cut into a rectangular shape corresponding to a packaging bag dimension described later and then score lines were formed on the surfaces of the films. After that, two films, in which the score lines were formed, were overlapped with each other so that the innermost layers (sealant layers) would face each other and then contents prepared in advance were placed in the container part, followed by heat-sealing the four edges. The seal width (Ls of  FIG. 2 ) was 5 mm. Finally, linear notches were formed in the seal part to provide a packaging bag. Each notch was formed at a position of an edge so as to have a distance (Ln of  FIG. 2 ) of 10 mm from the corner where this edge abutted with the adjacent edge. The contents held in each packaging bag were a medical tape having a thickness of 5 mm and having a dimension smaller than that of the packaging bag by 30 mm in the lateral and longitudinal lengths. 
     Table 1 shows information on the packaging bags of Examples 1-1 to 1-14 and Comparative Examples 1-1 to 1-11 in terms of the dimension of the packaging bag, the distance La from each end of the first and second score lines to the inner edge of the seal part, the shape of the score lines, and evaluation (presence or absence of cracks in the aluminum layer). It should be noted that when the distance La has a positive value, the score line is away from the seal part in plan view, and when it has a negative value, the score line is formed being extended onto the seal part. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                   
                 Dimension  
                   
                   
                   
               
               
                   
                 of packaging bag 
                 Distance La 
                   
                 Presence or 
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 Lateral length 
                 Longitudinal 
                 First 
                 Second 
                 Processing 
                 absence of 
               
               
                   
                 (mm) 
                 length (mm) 
                 (mm) 
                 (mm) 
                 shape 
                 cracks 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Example 1-1 
                 110 
                 95 
                 5 
                 5 
                 Straight line 
                 Absent 
               
               
                 Example 1-2 
                 71 
                 58 
                 3 
                 3 
                 Straight line 
                 Absent 
               
               
                 Example 1-3 
                 80 
                 67 
                 1 
                 1 
                 Straight line 
                 Absent 
               
               
                 Example 1-4 
                 72 
                 72 
                 2 
                 3 
                 Straight perforation 
                 Absent 
               
               
                 Example 1-5 
                 120 
                 100 
                 4 
                 2 
                 Straight perforation 
                 Absent 
               
               
                 Example 1-6 
                 93 
                 80 
                 3 
                 2 
                 Curve 
                 Absent 
               
               
                 Example 1-7 
                 150 
                 100 
                 3 
                 3 
                 Curve 
                 Absent 
               
               
                 Example 1-8 
                 103 
                 90 
                 2 
                 4 
                 Curved perforation 
                 Absent 
               
               
                 Example 1-9 
                 80 
                 80 
                 2 
                 2 
                 Curved perforation 
                 Absent 
               
               
                 Example 1-10 
                 112 
                 99 
                 2.5 
                 2.5 
                 Kanji character for 
                 Absent 
               
               
                   
                   
                   
                   
                   
                 eight 
                   
               
               
                 Example 1-11 
                 90 
                 130 
                 2 
                 3 
                 Kanji character for 
                 Absent 
               
               
                   
                   
                   
                   
                   
                 eight 
                   
               
               
                 Example 1-12 
                 100 
                 100 
                 3 
                 3 
                 Double line 
                 Absent 
               
               
                 Example 1-13 
                 82 
                 82 
                 3 
                 3 
                 Triple line 
                 Absent 
               
               
                 Example 1-14 
                 95 
                 110 
                 5 
                 5 
                 Quadruple line 
                 Absent 
               
               
                 Comparative 
                 110 
                 95 
                 0 
                 0 
                 Straight line 
                 Present 
               
               
                 Example 1-1 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 71 
                 58 
                 −1 
                 −1 
                 Straight line 
                 Present 
               
               
                 Example 1-2 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 80 
                 67 
                 −3 
                 −3 
                 Straight line 
                 Present 
               
               
                 Example 1-3 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 110 
                 95 
                 −5 
                 −5 
                 Straight line 
                 Present 
               
               
                 Example 1-4 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 72 
                 72 
                 −5 
                 −3 
                 Straight perforation 
                 Present 
               
               
                 Example 1-5 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 150 
                 100 
                 −5 
                 −3 
                 Curve 
                 Present 
               
               
                 Example 1-6 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 112 
                 99 
                 −5 
                 −3 
                 Kanji character for 
                 Present 
               
               
                 Example 1-7 
                   
                   
                   
                   
                 eight 
                   
               
               
                 Comparative 
                 103 
                 90 
                 −5 
                 −4 
                 Curved perforation 
                 Present 
               
               
                 Example 1-8 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 100 
                 100 
                 −5 
                 −5 
                 Double line 
                 Present 
               
               
                 Example 1-9 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 82 
                 82 
                 −5 
                 −5 
                 Triple line 
                 Present 
               
               
                 Example 1-10 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 95 
                 110 
                 −5 
                 −5 
                 Quadruple line 
                 Present 
               
               
                 Example 1-11 
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In the packaging bags of Examples 1-1 to 1-14, the first and second score lines were formed away from the inner edge of the seal part by 1 mm or more. Therefore, stress caused by sealing in the aluminum layer near the inner edge of the seal part was reduced. Thus, as shown in Table 1, microcracks occurred in none of the samples. Accordingly, it was confirmed that occurrence of microcracks in the aluminum layer near the inner edge of the seal part was prevented by forming the score lines away from the seal part. From this result, it is considered that the occurrence of microcracks can be more effectively prevented in a packaging bag using a film not including an aluminum layer. 
     In the packaging bags of Comparative Examples 1-1 to 1-11, the score lines were formed so as to abut with the seal part or formed being extended onto the seal part. Therefore, large stress was caused by sealing in the aluminum layer near the inner edge of the seal part. Thus, as shown in Table 1, microcracks occurred in all of the samples. 
     Examples Related to the Second Embodiment 
     Packaging bags of examples and comparative examples were prepared and openability of these packaging bags was evaluated. The packaging bags of the examples were each prepared by changing the position and the shape of the score lines of the packaging bag  200  shown in  FIG. 6 . In the packaging bags of the comparative examples, the score lines of the packaging bag  200  were formed so as not to intersect the phantom straight lines extending from the respective notches (Comparative Examples 2-1 to 2-9), or were respectively formed so as to be symmetrical with those of the examples about the phantom straight line (Comparative Examples 2-10 and 2-11). In all the examples and the comparative examples, two score lines were formed similarly to the packaging bag  200  so as to be symmetrical about the diagonal line drawn from the corner where the two edges respectively provided with the two notches abutted with each other (first and second score lines). 
     For each of the examples and the comparative examples, packaging bags respectively using the films having the following layer structures from the outermost layer to the innermost layer were prepared. 
     (1) Polyethylene terephthalate (PET) (12 μm)/aluminum (AL) ( 7 /PET having heat-sealing properties (20 μm to 50 μm) 
     (2) Cellophane (#300 to #500)/AL (7 μm)/PET having heat-sealing properties (20 μm to 50 μm) 
     (3) PET (12 μm)/AL (9 μm)/polyethylene (PE) (20 μm to 50 μm) 
     (4) PET (12 μm)/PE (10 μm to 30 μm)/AL (7 μm)/PE (10 μm to 40 μm) 
     (5) Cellophane (#300 to #500)/PE (10 μm to 30 μm)/AL (7 μm)/PE (10 μm to 40 μm) 
     (6) PET (12 μm)/PET having heat-sealing properties (10 μm to 50 μm) 
     (7) Transparent deposition PET (12 μm)/PET having heat-sealing properties (10 μm to 50 μm) 
     (8) PET (12 μm)/PE (10 μm to 50 μm) 
     The above films were each cut into a rectangular shape corresponding to a packaging bag dimension described later and then score lines were formed on the surfaces of the films. After that, two films, in which the score lines were formed, were overlapped with each other so that the innermost layers (sealant layers) would face each other, followed by sealing the four edges. The seal width (Ls of  FIG. 7 ) was 5 mm. Finally, linear notches were formed in the seal part to provide a packaging bag. Each notch was formed at a position of an edge so as to have a distance (Ln of  FIG. 7 ) of 10 mm from the corner where this edge abutted with the adjacent edge. 
     The prepared packaging bags were evaluated in terms of openability when opened from the first and second notches as start points. Table 2 shows information on Examples 2-1 to 2-14 and Comparative Examples 2-1 to 2-11 in terms of the dimension of the packaging bag, the positions La 1  and La 2  of ends of each score line, the shape of the score lines, and evaluation (openability). It should be noted that when the positions La 1  and La 2  of the ends have a positive value, the score line is at a position above the first straight line  61  in  FIG. 7 , and when they have a negative value, the score line is at a position below the first straight line  61 . 
     In the evaluations, if the break line reached the edge that faced the notch in all the samples, the packaging bag was taken to have sufficient openability and evaluated with a mark “++”. If the break line did not reach the edge that faced the edge in which the notch was formed and failure in opening occurred in all the samples, the packaging bag was taken to have no openability and evaluated with a mark “−”. If some samples were confirmed to have good openability and other samples caused failure in opening, the packaging bag was taken to have insufficient openability and was evaluated with a mark “+”. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                   
                 Dimension  
                 Positions of 
                   
                   
               
               
                   
                 of packaging bag 
                 score line ends 
                   
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 Lateral length 
                 Longitudinal 
                 La1 
                 La2 
                   
                   
               
               
                   
                 (mm) 
                 length (mm) 
                 (mm) 
                 (mm) 
                 Shape of score line 
                 Openability 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Example 2-1 
                 110 
                 95 
                 −3 
                 3 
                 Straight line 
                 ++ 
               
               
                 Example 2-2 
                 71 
                 58 
                 −2 
                 2 
                 Straight line 
                 ++ 
               
               
                 Example 2-3 
                 80 
                 67 
                 −1 
                 1 
                 Straight line 
                 ++ 
               
               
                 Example 2-4 
                 72 
                 72 
                 −3 
                 3 
                 Straight perforation 
                 ++ 
               
               
                 Example 2-5 
                 120 
                 100 
                 −4 
                 2 
                 Straight perforation 
                 ++ 
               
               
                 Example 2-6 
                 93 
                 80 
                 −3 
                 2 
                 Curve 
                 ++ 
               
               
                 Example 2-7 
                 150 
                 100 
                 −3 
                 3 
                 Curve 
                 ++ 
               
               
                 Example 2-8 
                 103 
                 90 
                 −2 
                 4 
                 Curved perforation 
                 ++ 
               
               
                 Example 2-9 
                 80 
                 80 
                 −2 
                 2 
                 Curved perforation 
                 ++ 
               
               
                 Example 2-10 
                 112 
                 99 
                 −2.5 
                 2.5 
                 Kanji character for 
                 ++ 
               
               
                   
                   
                   
                   
                   
                 eight 
                   
               
               
                 Example 2-11 
                 90 
                 130 
                 −2 
                 3 
                 Kanji character for 
                 ++ 
               
               
                   
                   
                   
                   
                   
                 eight 
                   
               
               
                 Example 2-12 
                 100 
                 100 
                 −3 
                 3 
                 Double line 
                 ++ 
               
               
                 Example 2-13 
                 82 
                 82 
                 −3 
                 3 
                 Triple line 
                 ++ 
               
               
                 Example 2-14 
                 95 
                 110 
                 −4 
                 4 
                 Quadruple line 
                 ++ 
               
               
                 Comparative 
                 110 
                 95 
                 0 
                 0 
                 Straight line 
                 − 
               
               
                 Example 2-1 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 71 
                 58 
                 2 
                 2 
                 Straight line 
                 + 
               
               
                 Example 2-2 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 80 
                 67 
                 1 
                 0 
                 Straight line 
                 − 
               
               
                 Example 2-3 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 110 
                 95 
                 −2 
                 −2 
                 Straight line 
                 − 
               
               
                 Example 2-4 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 72 
                 72 
                 0 
                 0 
                 Straight perforation 
                 − 
               
               
                 Example 2-5 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 150 
                 100 
                 0 
                 0 
                 Curve 
                 − 
               
               
                 example 2-6 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 112 
                 99 
                 0 
                 0 
                 Kanji character for 
                 − 
               
               
                 Example 2-7 
                   
                   
                   
                   
                 eight 
                   
               
               
                 Comparative 
                 103 
                 90 
                 2 
                 4 
                 Curved perforation 
                 + 
               
               
                 Example 2-8 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 100 
                 100 
                 0 
                 0 
                 Double line 
                 − 
               
               
                 Example 2-9 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 82 
                 82 
                 3 
                 −3 
                 Triple line 
                 − 
               
               
                 example 2-10 
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 95 
                 110 
                 1 
                 −1 
                 Quadruple line 
                 − 
               
               
                 example 2-11 
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     In the packaging bags of Examples 2-1 to 2-14, the first and second score lines could each have an allowable angular range relative to the direction of forming the break line. Therefore, even when the direction of forming the break line was not parallel to the straight line extending from the notch to the facing edge, the break line could smoothly reach the first score line or the second score line, i.e., the break line could reach the facing edge from the notch. From this result, as shown in Table 2, it was confirmed that the packaging bags of Examples 2-1 to 2-14 had sufficient openability. It should be noted that regardless of the layer structures and thicknesses of the films, the same results were obtained. 
     In contrast, in some films of the packaging bags of Comparative Examples 2-1 to 2-11, the break line could not reach the facing edge from the notch, causing failure in opening. Specifically, in the packaging bags of Comparative Examples 2-1, 2-3 to 2-7 and 2-9 to 2-11, the first and second score lines could not each have an allowable angular range relative to the direction of forming the break line. Therefore, if the direction of forming the break line was not parallel to the straight line extending from the notch to the facing edge, the break line could not successfully reach the first score line or the second score line. Accordingly, the break line could not reach the facing edge from the notch, causing failure in opening. It should be noted that regardless of the layer structures and thicknesses of the films, the same results were obtained. 
     In Comparative Examples 2-2 and 2-8, the first and second score lines each did not have an allowable angular range relative to the direction of forming the break line. However, the break line was prevented from being directed to the edge near the notch, i.e., the edge adjacent to the edge in which the notch was formed. Thus in some samples, the occurrence of failure in opening was prevented. 
     Although the packaging bags related to the third embodiment are not included in Examples 2-1 to 2-14, similar results are expected to be obtained from these packaging bags. 
     &lt;Examples According to the Third Embodiment, i.e., the Mode in which the Score Lines are Extended onto the Seal Part&gt; 
     Packaging bags of examples and comparative examples were prepared and openability of these packaging bags was evaluated. The packaging bags of the examples were prepared by changing the positions (distance La 3 , see  FIG. 11 ) and the shapes of the score lines of the packaging bags  901  to  905  shown in  FIGS. 15 to 19 . In the packaging bags of the comparative examples, the score lines of the packaging bags  901  to  905  were each formed so as to contact the phantom straight line extending from the notch (Comparative Examples 3-1 to 3-3 and 3-5 to 3-11), or were each formed in an area that was symmetrical with the area where the score lines of the packaging bags of the examples were formed, about the phantom straight line extending from the notch (Comparative Example 3-4). 
     For each of the examples and the comparative examples, packaging bags respectively using the films having the following layer structures from the outermost layer to the innermost layer were prepared. 
     (1) Polyethylene terephthalate (PET) (12 μm)/aluminum (AL) ( 7 /PET having heat-sealing properties (20 μm to 50 μm) 
     (2) Cellophane (#300 to #500)/AL (7 μm)/PET having heat-sealing properties (20 μm to 50 μm) 
     (3) PET (12 μm)/AL (9 μm)/polyethylene (PE) (20 μm to 50 μm) 
     (4) PET (12 μm)/PE (10 μm to 30 μm)/AL (7 μm)/PE (10 μm to 40 μm) 
     (5) Cellophane (#300 to #500)/PE (10 μm to 30 μm)/AL (7 μm)/PE (10 μm to 40 μm) 
     (6) PET (12 μm)/PET having heat-sealing properties (10 μm to 50 μm) 
     (7) Transparent deposition PET (12 μm)/PET having heat-sealing properties (10 μm to 50 μm) 
     (8) PET (12 μm)/PE (10 μm to 50 μm) 
     The above films were each cut into a rectangular shape corresponding to a packaging bag dimension described later and then score lines were formed on the surfaces of the films. After that, two films, in which the score lines were formed, were overlapped with each other so that the innermost layers (sealant layers) would face each other, followed by sealing the four edges. The seal width (Ls of  FIG. 11 ) was 5 mm. Finally, linear notches were formed in the seal part to provide a packaging bag. Each notch was formed at a position of an edge so as to have a distance (Ln of  FIG. 11 ) of 10 mm from the corner where this edge abutted with the adjacent edge. 
     The prepared packaging bags were evaluated in terms of openability when opened from the first and second notches as start points. When opening each packaging bag, the films were each broken by applying a load in a direction of forming the break line toward the edge that was adjacent to the edge where the notch was formed, i.e., toward the edge near the notch. Table 3 shows information on the packaging bags of Examples 3-1 to 3-14 and Comparative Examples 3-1 to 3-11 in terms of the dimension of the packaging bag, the minimum value La 3  of the distance from the first or second score line to the phantom straight line extending from the notch, the shape of the score lines, presence or absence of the auxiliary lines, and evaluation (openability). It should be noted that when the minimum value La 3  of the distance has a positive value, the score line is at a position above the first straight line  61  in  FIG. 11 , and when it has a negative value, the score line is at a position below thereof. 
     In the evaluations, if the break line reached the edge that faced the notch in all the samples, the packaging bag was taken to have sufficient openability and evaluated with a mark “+”. If the break line did not reach the edge that faced the edge in which the notch was formed and failure in opening occurred in all the samples, the packaging bag was taken to have no openability and evaluated with a mark “−”. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                   
                 Dimension  
                   
                   
                   
                   
               
               
                   
                 of packaging bag 
                 Distance La3 
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 Lateral length 
                 Longitudinal 
                 First 
                 Second 
                 Shape of 
                 Auxiliary 
                   
               
               
                   
                 (mm) 
                 length (mm) 
                 (mm) 
                 (mm) 
                 score line 
                 lines 
                 Openability 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Example 3-1 
                 110 
                 95 
                 3 
                 3 
                 Straight line 
                 Present 
                 + 
               
               
                 Example 3-2 
                 71 
                 58 
                 2 
                 2 
                 Straight line 
                 Absent 
                 + 
               
               
                 Example 3-3 
                 80 
                 67 
                 1 
                 1 
                 Straight line 
                 Present 
                 + 
               
               
                 Example 3-4 
                 72 
                 72 
                 2 
                 3 
                 Straight 
                 Present 
                 + 
               
               
                   
                   
                   
                   
                   
                 perforation 
                   
                   
               
               
                 Example 3-5 
                 120 
                 100 
                 4 
                 2 
                 Straight 
                 Absent 
                 + 
               
               
                   
                   
                   
                   
                   
                 perforation 
                   
                   
               
               
                 Example 3-6 
                 93 
                 80 
                 3 
                 2 
                 Curve 
                 Present 
                 + 
               
               
                 Example 3-7 
                 150 
                 100 
                 3 
                 3 
                 Curve 
                 Absent 
                 + 
               
               
                 Example 3-8 
                 103 
                 90 
                 2 
                 4 
                 Curved 
                 Present 
                 + 
               
               
                   
                   
                   
                   
                   
                 perforation 
                   
                   
               
               
                 Example 3-9 
                 80 
                 80 
                 2 
                 2 
                 Curved 
                 Absent 
                 + 
               
               
                   
                   
                   
                   
                   
                 perforation 
                   
                   
               
               
                 Example 3-10 
                 112 
                 99 
                 2.5 
                 2.5 
                 Kanji 
                 Present 
                 + 
               
               
                   
                   
                   
                   
                   
                 character for 
                   
                   
               
               
                   
                   
                   
                   
                   
                 eight 
                   
                   
               
               
                 Example 3-11 
                 90 
                 130 
                 2 
                 3 
                 Kanji 
                 Absent 
                 + 
               
               
                   
                   
                   
                   
                   
                 character for 
                   
                   
               
               
                   
                   
                   
                   
                   
                 eight 
                   
                   
               
               
                 Example 3-12 
                 100 
                 100 
                 3 
                 3 
                 Double line 
                 Present 
                 + 
               
               
                 Example 3-13 
                 82 
                 82 
                 3 
                 3 
                 Triple line 
                 Absent 
                 + 
               
               
                 Example 3-14 
                 95 
                 110 
                 4 
                 4 
                 Quadruple 
                 Absent 
                 + 
               
               
                   
                   
                   
                   
                   
                 line 
                   
                   
               
               
                 Comparative 
                 110 
                 95 
                 0 
                 0 
                 Straight line 
                 Absent 
                 − 
               
               
                 example 3-1 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 71 
                 58 
                 0 
                 2 
                 Straight line 
                 Absent 
                 − 
               
               
                 Example 3-2 
                   
                   
                   
                   
                   
                   
                 (First) 
               
               
                 Comparative 
                 80 
                 67 
                 1 
                 0 
                 Straight line 
                 Absent 
                 − 
               
               
                 Example 3-3 
                   
                   
                   
                   
                   
                   
                 (Second) 
               
               
                 Comparative 
                 110 
                 95 
                 −2 
                 −2 
                 Straight line 
                 Absent 
                 − 
               
               
                 example 3-4 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 72 
                 72 
                 0 
                 0 
                 Straight 
                 Absent 
                 − 
               
               
                 Example 3-5 
                   
                   
                   
                   
                 perforation 
                   
                   
               
               
                 Comparative 
                 150 
                 100 
                 0 
                 0 
                 Curve 
                 Absent 
                 − 
               
               
                 Example 3-6 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 112 
                 99 
                 0 
                 0 
                 Kanji 
                 Absent 
                 − 
               
               
                 Example 3-7 
                   
                   
                   
                   
                 character for 
                   
                   
               
               
                   
                   
                   
                   
                   
                 eight 
                   
                   
               
               
                 Comparative 
                 103 
                 90 
                 0 
                 4 
                 Curved 
                 Absent 
                 − 
               
               
                 Example 3-8 
                   
                   
                   
                   
                 perforation 
                   
                 (First) 
               
               
                 Comparative 
                 100 
                 100 
                 0 
                 0 
                 Double line 
                 Absent 
                 − 
               
               
                 example 3-9 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Comparative 
                 82 
                 82 
                 3 
                 0 
                 Triple line 
                 Absent 
                 − 
               
               
                 Example 3-10 
                   
                   
                   
                   
                   
                   
                 (Second) 
               
               
                 Comparative 
                 95 
                 110 
                 0 
                 0 
                 Quadruple 
                 Absent 
                 − 
               
               
                 Example 3-11 
                   
                   
                   
                   
                 line 
                   
                   
               
               
                   
               
            
           
         
       
     
     In the packaging bags of Examples 3-1 to 3-14, the break line was formed so as to pass through a portion of the container part sandwiched between the phantom straight line extending from the notch and the edge near the notch among the edges adjacent to the edge in which the notch was formed. Therefore, even when the break line was formed toward the edge near the notch among the edges adjacent to the edge in which the notch was formed, the break line could smoothly reach the score line and could be guided to the edge which faced the notch. Accordingly, as shown in Table 3, it was confirmed that the packaging bags of Examples 3-1 to 3-14 had sufficient openability. It should be noted that regardless of the layer structures and thicknesses of the films, the same results were obtained. 
     In contrast, in the packaging bags of Comparative Examples 3-1 to 3-11, the break line could not reach the facing edge from the notch, causing failure in opening, in at least either one of the first and second score lines  1  and  2 . Specifically, in Comparative Examples 3-2 and 3-8, the break line deviated from the first score line formed on the straight line extending from the notch and caused failure in opening. In Comparative Examples 3-3 and 3-10 as well, the break line deviated from the sixth score line formed on the straight line extending from the notch and caused failure in opening. In other comparative examples, the break lines deviated from both the first and second score lines and caused failure in opening. 
     As the packaging bags of Examples 3-1 to 3-14, packaging bags, in which only either one of the first and second score lines was formed, were additionally formed to evaluate openability. The packaging bags in which only either one of the first and second score lines was formed also produced the same results as in the packaging bags of Examples 3-1 to 3-14 shown in Table 3. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be suitably used for packaging sheet-shaped contents, such as a medical tape or a patch, for transdermal administration of medication, as well as for other applications. 
     REFERENCE SIGNS LIST 
       100 - 103 ,  200 - 203 ,  300 - 303 ,  901 - 905  Packaging bag;  10  Film;  20  Seal part;  21  Inner edge of seal part;  30  Container part;  41  First score line;  42  Second score line;  51  First notch;  52  Second notch;  61  Phantom first straight line;  62  Phantom second straight line;  71  First edge;  72  Second edge;  73  Third edge;  74  Fourth edge;  81  First auxiliary score line;  82  Second auxiliary score line.