JP7358977B2 - packaging bag - Google Patents

Description

The present invention relates to a packaging bag.

A three-sided seal bag is made by folding a single rectangular laminated film in half and sealing the combined edges to form a storage area, or a three-sided sealed bag in which a rectangular laminated film is stacked on top of each other and the edges are sealed. 2. Description of the Related Art Packaging bags such as four-sided sealed bags that are sealed to form a storage area are known.

Patent Document 1 discloses a four-sided seal bag (packaging bag) in which the inner layers of two rectangular laminates each having a cut line (weakening line) are overlapped and heat-sealed at the four peripheral edges. . The score line of one of the laminates is formed from one end of the laminate in the width direction to the other end, and between one end and the other end, it branches from one point on the one end side and converges to one point on the other end side. It has an arc-shaped cut line that bulges and an arc-shaped cut line that bulges downward. In addition, the score line of the other laminate is between the arc-shaped score line that swells upward and the arc-shaped score line that swells downward from one end of the laminate in the width direction of the laminate. are formed in corresponding positions. In each score line, three score lines inward from the end converge into one at one end and the other end, respectively, to facilitate the initiation of tearing (rupture) of the score line. It has a convergent cut line.

According to the four-sided seal bag of Patent Document 1, the user can tear each laminate along the score line using the convergent score line as a trigger. In particular, since one of the laminates has an arcuate cut line, there is a step between the cut surfaces of the two laminates formed by tearing in the height direction of the four-sided seal bag, making it difficult to use. A person can use this step to separate the two laminates from each other. As a result, the user can widen the opening formed by tearing and can easily take out the contents.

JP 2017-124873 Publication

However, since the four-sided seal bag of Patent Document 1 has convergent score lines, it is difficult to ensure strength at the edges around the convergent score line, and the score line is formed so as to straddle the seal. Therefore, there were problems such as cracks occurring in the laminate when it was sealed, and there was room for improvement in the position where the weakening line was formed.

The present invention has been made in view of these problems, and allows the fracture to progress along the weakened line while ensuring the strength at the edge, thereby reliably forming a step in the opening, thereby making it easy to remove the contents. The purpose is to provide a packaging bag from which items can be taken out.

One aspect of the present invention for solving the above problems is a rectangular packaging bag in which a storage section is formed by overlapping films and sealing at least three edges, wherein the overlapping film is placed on top of the storage section. A first weakening line that linearly weakens the strength of one of the overlapping films, a second weakening line that linearly weakens the strength of the other of the superimposed films, and one of the three edges. a notch formed on a certain first edge that causes the film to break when unsealing the container, the first line of weakening being perpendicular to the stretching direction of the first edge; one end located a first distance away from the first edge in a first direction from the first edge to a second edge opposite the first edge; A first arc-shaped first end protruding toward the first edge, connecting the other end a second distance away from one end and a predetermined distance away from the one end in a second direction perpendicular to the first direction. and a first straight line extending from the other end of the first curved part in the first direction, and the second line of weakening extends from the first edge in the first direction. one end located a first distance apart, and another end located a second distance from the one end in the first direction and a predetermined distance from the one end in a direction opposite the second direction. an arcuate second curved section protruding toward the first end edge side, and a second linear section extending in the first direction from the other end of the second curved section; The curved part and the second curved part intersect with each other and the straight line extending from the notch in the first direction, and the first straight part and the second curved part intersect with each other in a plan view of the stacked films. The second straight line is separated by a third distance in the second direction, the first distance is greater than 1 mm and less than 15 mm, the second distance is greater than 1 mm and less than 20 mm, and the third distance is greater than 1 mm and less than 20 mm. This is a packaging bag in which the distance is greater than 1 mm and less than 15 mm.

According to the present invention, a packaging bag is provided that allows the breakage to proceed reliably along the weakened line while ensuring strength at the edges, thereby forming a step at the opening and making it possible to easily take out the contents. can be provided.

A plan view and a side view of a packaging bag according to an embodiment of the present invention Diagram explaining the formation position of the weakening line A plan view illustrating how to use a packaging bag according to an embodiment of the present invention A plan view of a packaging bag according to a modification of the present invention

A packaging bag according to an embodiment of the present invention will be described with reference to the drawings.

1 is a plan view and a side view of a packaging bag 100 according to an embodiment of the present invention, FIG. 2 is an enlarged view of a portion A surrounded by a dotted line in FIG. FIG. 2 is a plan view explaining how to use the .

The packaging bag 100 has a storage portion 30 surrounded by edges 71 to 74, which are sealed portions formed by overlapping two rectangular films 10 and sealing the four edges 71 to 74 over a predetermined width. It is a four-sided sealed packaging bag. The packaging bag 100 has a first weakening line 41 and a second weakening line 42 that linearly weaken the strength of the two stacked films 10 formed on the storage part 30 and an edge 71. , a first notch 51 that causes the film 10 to break when the housing section 30 is unsealed. By at least partially breaking the film 10 using the first notch 51 to form an opening in the packaging bag 100, the contents stored in the storage section 30 can be taken out.

Note that in the following, the edge on which the first notch 51 is formed will be referred to as a first edge 71, and the edge opposite to the first edge 71 will be referred to as a second edge 72, and the first edge 71. Among the adjacent edges, the edge closer to the first notch 51 is called a third edge 73, and the edge opposite the third edge 73 is called a fourth edge 74. For convenience, as shown by the arrow in FIG. However, the direction from the third edge 73 to the fourth edge 74 is defined as a second direction.

(film)
The film 10 is a film material that is formed into a rectangular shape and whose edges are sealed to form the packaging bag 100 having the storage section 30. For the film 10, a multilayer film having two or more layers including a sealant layer as the innermost layer can be suitably used to seal the edges 71 to 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 sealant (PET with heat sealability (HS-PET)). , cyclic polyolefin, EVOH sealant, etc.), and in the case of a multilayer film, an appropriate combination of these can be used. The width of the film 10 in the first direction is preferably 45 mm or more in order to suitably form the steps described below by human hands.

For example, the layer structure of the film 10 is, in order from the outermost layer to the innermost layer when forming the packaging bag 100, PET (12 μm)/AL (7 to 20 μm)/HS-PET (20 to 50 μm), PET (12 μm). )/AL(7-20μm)/PE(10-30μm)/PCO(10-30μm), Cellophane/AL(7-20μm)/HS-PET(20-50μm), Cellophane/AL(7-20μm)/ PE (10-30μm)/PCO (10-30μm), PET (12μm)/AL (7-20μm)/PE (20-50μm), PET (12μm)/PE (10-30μm)/AL (7-20μm) )/PE (10 to 40 μm), cellophane/PE (10 to 30 μm)/AL (7 μm)/PE (10 to 40 μm), etc. can be adopted. In the case of the above example, the first weakened line 41 and the second weakened line 42 can be formed in the outermost layer.

(notch)
The first notch 51 is a cut formed in the first edge 71 of the packaging bag 100. When the user of the packaging bag 100 opens the storage section 30, the first notch 51 can be used as a trigger to start tearing the film 10. The first notch 51 is formed by cutting the first edge 71 linearly over a predetermined length toward the opposing second edge 72 . The shape of the first notch 51 is not limited to a linear shape as long as it triggers the breakage of the film 10, and a triangular, pentagonal, etc. notch shape can be adopted.

(weakening line)
The first weakening line 41 and the second weakening line 42 are formed by weakening the strength linearly in a predetermined positional relationship on each of the two overlapping films 10. Although details will be described later, the packaging bag 100 can be opened by allowing the break caused by the first notch 51 to proceed on the first weakening line 41 and the second weakening line 42. . The first weakened line 41 includes a first curved portion 41a and a first straight portion 41b. Further, the second weakened line 42 includes a second curved portion 42a and a second straight portion 42b. The first weakened line 41 is formed on the front side of the plane of the plane of FIG. 1, and the second weakened line 42 is formed on the back side of the plane of the plane of FIG.

The first curved portion 41a has one end 41a' located a first distance a away from the first edge 71 in the first direction, and a second end 41a' located a second distance b away from the one end in the first direction. , and the other end 41a'' located a predetermined distance away from one end in the second direction, and is an arcuate curve that projects toward the first edge 71 side. Further, the first straight portion 41b is a straight line extending a predetermined length in the first direction from the other end 41a'' of the first curved portion 41a.

The second curved portion 42a has one end 42a' located a first distance a away from the first edge 71 in the first direction, and a second end 42a' located a second distance b away from the one end in the first direction. , is an arcuate curve that connects one end to the other end 42a'' located a predetermined distance apart from the second direction in a direction opposite to the second direction, and projects toward the first edge 71 side. Further, the second straight portion 42b is a straight line extending a predetermined length in the first direction from the other end 42a'' of the second curved portion 42a.

The first curved portion 41a and the second curved portion 42a intersect with each other in a plan view of the superimposed film 10, and each has a virtual shape extending from the first notch 51 in the first direction. It is formed to intersect the straight line 80. Further, the first straight portion 41b and the second straight portion 42b are formed to be separated by a third distance c in the second direction.

The first weakening line 41 and the second weakening line 42 have a first distance a greater than 1 mm and less than 15 mm, a second distance b greater than 1 mm and less than 20 mm, and a third distance c greater than 1 mm. It is formed at a position smaller than 15 mm.

Although details will be described later, the first curved portion 41a and the second curved portion 42a are such that the intersection of the first curved portion 41a and the second curved portion 42a is located in the first direction from the first notch 51. It is preferable to be located on a straight line 80 extending toward. Further, it is preferable that the curvature of both the first curved part 41a and the second curved part 42a continuously changes, and the direction of the tangent at the other ends 41a'' and 42a'' is the first direction. .

The first weakening line 41 and the second weakening line 42 are obtained, for example, by forming intermittent linear cuts (half cuts) in the film 10. In order to facilitate tearing, when the film 10 is a laminated film, it is preferable that cuts are provided in the stretched base material layer that does not have cuttability except for the aluminum layer. The first weakening line 41 and the second weakening line 42 can be formed using a known method such as a blade type such as a Thomson blade or a laser blade, or a carbon dioxide gas laser.

(Function of weakening line)
In the packaging bag 100 equipped with the first weakening line 41 and the second weakening line 42, by applying force to the first notch 51, the first notch 51 causes the first edge 71 to break. can be generated. The breakage progresses from the first edge 71 in the first direction by applying a force to the packaging bag 100 that shears the film 10 along the straight line 80. Then, when the break advances a predetermined distance from the first edge 71, it can reach at least either the first curved portion 41a or the second curved portion 42a.

By continuing to apply force to the packaging bag 100, the rupture progresses along the first curved part 41a to the other end 41a'', as shown by the black arrow in FIG. 41b to the end on the second edge 72 side. Similarly, the break that has reached the second curved section 42a proceeds along the second curved section 42a to the other end 42a'', then proceeds along the second straight section 42b and reaches the second edge. The end on the 72 side can be reached.

As a result, as shown in FIG. 3, an opening surrounded by the cut surfaces of the first weakened line 41 and the second weakened line 42 is formed in the packaging bag 100. As described above, since the first straight part 41b and the second straight part 42b are formed apart from each other by the third distance c, in plan view, there is a gap in the second direction between the respective cut surfaces. A step (interval) with a predetermined width W is formed. Due to this step, the opening formed by separating the two films 10 from each other can be widened, and the contents can be easily taken out.

In particular, since the first distance a is larger than 1 mm, it is possible to prevent the strength of the first edge 71 from decreasing due to the first weakening line 41 and the second weakening line 42, and also to prevent the strength of the first edge 71 from decreasing by using heat sealing. When forming the seal portion 20, it is possible to prevent the weakening line from partially breaking due to the tensile stress generated at the end of the housing portion 30 on the side of the seal portion 20, thereby preventing minute cracks from occurring. Further, since the first distance a is smaller than 15 mm, the breakage caused by the first notch 51 can quickly reach the first curved portion 41a and the second curved portion 42a.

Further, since the second distance b is larger than 1 mm, the first curved portion 41a and the second curved portion 42a change rapidly with respect to the first direction, and the breakage occurs along the first weakened line 41 and the second curved portion 42a. It is possible to prevent deviation from the second line of weakness 42. Furthermore, since the second distance b is smaller than 20 mm, it is possible to secure a wide area where the step width W is large over the first direction.

Moreover, since the third distance c is larger than 1 mm, the width W of the step formed by opening the package can be set to a size that allows the two films 10 to be easily separated from each other by human hands. Furthermore, since the third distance c is smaller than 15 mm, it is possible to prevent the width W of the step from becoming too large and requiring a large force for the progress of the fracture.

In addition, since the first curved portion 41a and the second curved portion 42a are formed to intersect with each other and the straight line 80 in a plan view of the film 10, breakage caused by the notch 51 may occur. However, it is possible to quickly reach at least one of the first curved portion 41a and the second curved portion 42a.

Further, since both the first curved portion 41a and the second curved portion 42a are arcuate curves that protrude toward the first edge 71 side, the breakage occurs at the first curved portion 41a and the second curved portion 42a. 42a to the first linear portion 41b and the second linear portion 42b, and can be prevented from deviating from the first weakening line 41 and the second weakening line 42.

Moreover, by forming the intersection of the first curved part 41a and the second curved part 42a to be located on the straight line 80, the breakage occurs between the first curved part 41a and the second curved part 42a. can be reached at the same time, allowing the fracture to proceed smoothly.

Further, the curvature of both the first curved part 41a and the second curved part 42a changes continuously, and the direction of the tangent at the other ends 41a'' and 42a'' is the first direction. is preferred. Thereby, the fracture that has proceeded along the first curved section 41a and the second curved section 42a can proceed smoothly to the first straight section 41b and the second straight section 42b, respectively.

As explained above, according to the packaging bag 100, the breakage that occurs due to the notch 51 reliably reaches the first weakened line 41 and the second weakened line 42, and the first weakened line 41 and Since it can proceed smoothly along the second weakened line 42, it is possible to easily form an opening with a step at a desired position.

(Modified example)
Next, the differences between the packaging bag 101 and the packaging bag 100 according to the modified example will be mainly explained. FIG. 4 is a plan view of the packaging bag 101. In addition, below, the same reference numerals are attached|subjected to the same or corresponding structure as embodiment, and description is abbreviate|omitted.

The difference between the packaging bag 101 and the packaging bag 100 is that the first weakening line 41 and the second weakening line 42 of the packaging bag 101 are the first line of weakness 41 and the second line of weakness 42 of the first straight part 41b and the second straight part 42b, respectively. Further, a first curved part 41a and a second curved part 42a are provided at the end on the edge 72 side of the second curved part,

Since both the first weakening line 41 and the second weakening line 42 include the two first curved portions 41a and the second curved portion 42a, the packaging bag 101 is broken from the third edge 73 side. Even if this occurs, the opening with a step can be formed by proceeding the fracture along the first weakened line 41 and the second weakened line 42. Note that a second notch 52 (not shown) that causes breakage may be formed on the straight line 80 of the third edge 73.

Although the above description has been made using a four-sided sealed bag as an example, the packaging bags 100 and 101 are not limited to four-sided sealed bags as long as they are rectangular packaging bags with at least three edges sealed to form a storage section. The packaging bags 100 and 101 may be, for example, three-sided sealed bags in which a rectangular laminated film is folded in two and the combined edges are sealed. Alternatively, a four-sided seal bag may be used in which a single rectangular laminated film is folded in half and has four edges.

Further, in the packaging bags 100 and 101, the step formed when the bag is opened may obstruct the movement of the film 10 on the third edge 73 side separated by the breakage. Specifically, in the case of the packaging bags 100 and 101 shown in FIGS. 1 and 3, when a force is applied so that the third edge 73 moves toward the back of the page, the film 10 on the front side of the page, The part sandwiched between the first weakened line 41 and the second weakened line 42 in plan view is the part sandwiched between the first weakened line 41 and the second weakened line 42 of the film 10 on the back side of the paper. Contact occurs and movement is inhibited. For this reason, it is preferable that force is applied to the packaging bags 100, 101 so that the third edge 73 comes to the front side and the fourth edge 74 goes to the back side of the paper. An opening guide indicating the tearing direction of 10 may be attached to the surface of the film 10 that is easily visible to the user.

A packaging bag according to the first embodiment shown in FIG. 1 was manufactured as a packaging bag according to an example and a comparative example, and its unsealability was evaluated. The width of the manufactured packaging bag in the first direction was 190 mm, and the first weakening line and the second weakening line were formed using a carbon dioxide laser with an output of 30W.

The manufactured packaging bag was evaluated for its unsealability and the presence or absence of a step when opened by applying force so that the third edge 73 moved toward the back of the page using the first notch. Table 1 shows the first distance a, second distance b, third distance c, and evaluation results (openability, step size, , occurrence of cracks, and overall evaluation).

In the item "Openability", if the break progresses from both the first weakening line and the second weakening line without deviating and the seal can be opened properly, "++" is indicated, and the breakage is partially A "+" indicates a case where the package was opened slightly deviating from either the first weakening line or the second weakening line, and the break occurred at either the first weakening line or the second weakening line. Cases where the package could not be opened due to a significant deviation are indicated by a "-" symbol.

The item "Easy to open the opening" was evaluated as follows based on the ease of opening the opening using the step formed as a result of tearing the film. In other words, if the opening can be easily opened by human hands, it is indicated by "++", if the opening can be opened by human hands, it is indicated by "+", and if it is difficult to open the opening by human hands. If so, it is indicated with a “-”.

The item "occurrence of cracks" was evaluated as follows based on the presence or absence of cracks at one end of the first edge side of the first weakened line and the second weakened line when the seal portion was formed. That is, the case where a crack occurred was indicated by "+", and the case where no crack occurred was indicated by "-".

For the "Overall evaluation" item, if any of the "openability", "size of steps", and "occurrence of cracks" are evaluated as "-", the packaging bag is evaluated as unsuitable as a whole. It is indicated by "-", and other cases are evaluated as suitable packaging bags and are indicated by "+".

In the packaging bags according to Examples 1 to 20, it was confirmed that no cracks were generated during manufacturing, that the bags could be opened, and that the openings could be suitably opened using the steps.

In the packaging bags according to Comparative Examples 1, 5, and 8, the first distance a is as small as 1 mm, so when the seal portion is formed, the first edge side of the first weakened line and the second weakened line Cracks occurred at the edges.

In the packaging bags according to Comparative Examples 2 and 9, the first distance a is as large as 15 mm, so the breakage cannot reach the first weakening line and the second weakening line, and the bag can be opened suitably. There wasn't.

In the packaging bags according to Comparative Examples 3, 5, and 8, since the second distance b is as small as 1 mm, the breakage cannot proceed along the first curved part and the second curved part, and the breakage cannot proceed along the first curved part and the second curved part. The package could not be opened properly because it deviated from the weakening line and the second weakening line.

In the packaging bags according to Comparative Examples 4 and 10, although a step with a large maximum width W could be formed, the second distance b was as large as 20 mm, so the area where the step was formed was narrow in the first direction. , it was difficult to open the opening.

In the packaging bag according to Comparative Example 6, since the third distance c was as small as 1 mm, the width W of the step was small and it was difficult to open the opening.

In the packaging bag according to Comparative Example 7, since the third distance c was as large as 15 mm, a large force was required for the breakage to progress, and the bag could not be opened properly.

The present invention can be suitably used for packaging sheet-like contents such as tape materials and patches for transdermal administration of drugs.

100, 101 Packaging bag 10 Film 20 Seal portion 30 Receiving portion 41 First line of weakening 42 Second line of weakening 51 First notch 52 Second notch 61 Virtual first straight line 62 Virtual second line Straight line 71 First edge 72 Second edge 73 Third edge 74 Fourth edge 80 Straight line extending from the notch

Claims (4)

A rectangular packaging bag formed by overlapping films and sealing at least three edges to form a storage part,
A first weakening line that linearly weakens the strength of one of the stacked films on the storage portion, and a second weakening line that linearly weakens the strength of the other of the stacked films. and,
a notch formed on a first edge, which is one of the three edges, that causes the film to break when the housing section is unsealed;
The first line of weakness is
from the first edge in a first direction perpendicular to the stretching direction of the first edge and from the first edge to a second edge opposite to the first edge. and a second distance from the one end in the first direction, and a predetermined distance from the one end in a second direction perpendicular to the first direction. an arc-shaped first curved portion protruding toward the first edge side, connecting the other ends at the same position;
a first linear part extending in the first direction from the other end of the first curved part,
The second line of weakness is
one end spaced apart from the first edge by the first distance in the first direction; and a second space spaced apart from the one end by the second distance in the first direction; an arc-shaped second curved portion protruding toward the first edge side and connecting the other end located a predetermined distance from the one end in the opposite direction;
a second linear part extending in the first direction from the other end of the second curved part,
The first curved portion and the second curved portion intersect with each other in a plan view of the superimposed films, and each intersects with a straight line extending from the notch toward the first direction,
The first linear portion and the second linear portion are separated by a third distance in the second direction,
the first distance is greater than 1 mm and less than 15 mm;
the second distance is greater than 1 mm and less than 20 mm;
the third distance is greater than 1 mm and less than 15 mm;
packaging bag. The intersection of the first curved part and the second curved part is located on a straight line extending from the notch toward the first direction,
The packaging bag according to claim 1. The curvature of both the first curved part and the second curved part continuously changes, and the direction of the tangent at the other end is the first direction.
The packaging bag according to claim 1 or 2. The width in the first direction is 45 mm or more,
The packaging bag according to any one of claims 1 to 3.

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