JP6937271B2 - Package - Google Patents

Description

The present invention relates to a packaging body having an accommodating portion composed of sheets, wherein the sheet has an opening auxiliary line on the surface.

As a package, a package having an accommodating portion composed of a sheet, in which the sheet has an opening auxiliary line on the surface (for example, Patent Document 1) is known.

In the package disclosed in Patent Document 1, a notch serving as an opening starting point when opening the package is formed on one end edge side of the sheet.
Further, in the package, the sheet has a sub-guide line extending on the surface along the opening direction (cut formation direction) at a position away from the notch forming position and one end side of the sub-guide line. It is provided with an opening auxiliary line having a plurality of guide lines, the other end of which extends inclined toward the notch and is arranged at intervals from each other in the opening direction.
Then, in the package, the other end side of the guide wire at a position closest to the notch is connected to the end side of the notch.

JP-A-2018-24481

In the above-mentioned package, when the object to be contained is taken out from the accommodating portion, the opening is started from the start end side of the incision, and the incision is formed via the guide line and the sub-guide line. The package is opened from one end edge side to the other end edge side.

However, in the above-mentioned package, since the guide wire is processed so as to be easily cleaved, the opening speed is relatively high when the package is opened along the guide line. Get faster. Therefore, the opening transition from the guide line to the sub-guide line could not be sufficiently performed, and the opening may be continued at a position deviated from the sub-guide line to the outside. In such a case, the opening may be completed in a state where a part of the package is cut off at a position in the middle of opening from the one end edge side to the other end edge side where the notch is formed. In such a case, the opening for taking out the contained object could not be made sufficiently large.

In view of such problems, it is an object of the present invention to provide a packaging body capable of having a sufficiently large opening for taking out the contained object from the accommodating portion when the contained object is taken out from the accommodating portion. do.

The package according to the present invention is
A packaging body having an accommodating portion composed of sheets.
The sheet is provided with an opening auxiliary wire processed for easy opening.
The opening auxiliary line has a curved portion that is curved toward the center side.

According to such a configuration, since the opening auxiliary line has a curved portion that is bent toward the central portion, when the opening person opens the package via the opening auxiliary portion, the curved portion is used. The part becomes a resistance to opening. As a result, since the opening speed of the package can be reduced at the bent portion, it is possible to prevent the opening from being continued at a position outside the opening auxiliary line.
As a result, it is possible to prevent the opening of the package from being completed in a state where a part of the package is cut off at a position in the middle of opening the package. Can be of any size.

In addition, in the above-mentioned package,
The sheet may be provided with the opening auxiliary lines at positions facing each other.

According to such a configuration, since the sheet is provided with the opening auxiliary lines at positions facing each other, it is possible to suppress the misalignment of the opening position on each side of the sheet facing each other. can. As a result, it is possible to more sufficiently prevent the opening position from being displaced from the easy-opening portion as compared with the case where the opening auxiliary line is provided only on one side of the sheet.
As a result, the opening for taking out the object to be contained from the accommodating portion can be made larger enough.

In addition, in the above-mentioned package,
The opening auxiliary line has a plurality of the curved portions, and has a plurality of curved portions.
The edge portions of the curved portions adjacent to each other of the opening auxiliary wire may be connected by a straight portion.

According to such a configuration, the opening auxiliary line has a plurality of the curved portions, and the edge portions of the adjacent curved portions of the opening auxiliary line are connected by a straight line portion, so that the adjacent curved portions are connected. The sheet between the portions can be opened along the straight portion. Therefore, it is possible to more sufficiently prevent the opening position from being displaced from the opening auxiliary line.
As a result, the opening for taking out the object to be contained from the accommodating portion can be made larger enough.

In addition, in the above-mentioned package,
The angle formed by the curved portion and the straight portion on the upstream side in the opening direction may be 20 ° or more and 50 ° or less.

According to such a configuration, the angle formed by the curved portion and the straight portion on the upstream side in the opening direction is 20 ° or more and 50 ° or less, so that an appropriate opening resistance can be imparted by the curved portion. .. As a result, since the opening speed of the package can be adjusted to an appropriate speed by the bent portion, the package can be opened relatively easily and an opening for taking out the object to be contained from the container. Can be large enough.

In addition, in the above-mentioned package,
The curved portion may have a radius of curvature of 0 mm or more and 11.5 mm or less at the tip portion on the central side.

According to such a configuration, since the radius of curvature of the central tip portion of the curved portion is 0 mm or more and 11.5 mm or less, an appropriate opening resistance can be imparted by the curved portion. As a result, since the opening speed of the package can be adjusted to an appropriate speed by the bent portion, the package can be opened relatively easily and an opening for taking out the object to be contained from the container. Can be large enough.

In addition, in the above-mentioned package,
Three or more bent portions may be arranged per 10 cm of the opening auxiliary line.

According to such a configuration, since three or more bent portions are arranged per 10 cm of the opening auxiliary line, it is possible to impart an appropriate opening resistance when opening the package. As a result, since the opening speed of the package can be adjusted to an appropriate speed, the package can be opened relatively easily, and the opening for taking out the object to be contained from the container is sufficiently large. Can be.

As described above, according to the present invention, there is provided a packaging body capable of having a sufficiently large opening for taking out the contained object from the accommodating portion when taking out the contained object.

The perspective view which shows the structure of the package which concerns on one Embodiment of this invention. The plan view which showed the structure of the package | body which concerns on one Embodiment of this invention from the upper side. The plan view which showed the structure of the package | body which concerns on one Embodiment of this invention from the lower side. The plan view which showed the opened state of the package which concerns on one Embodiment of this invention from the upper side. The plan view which showed the opened state of the package which concerns on one Embodiment of this invention from the lower side. The plan view which showed the initial state of opening of the package which concerns on one Embodiment of this invention from the upper side. The plan view which showed the state in the process of opening the package which concerns on one Embodiment of this invention from the upper side. The plan view which showed the state in the process of opening the package which concerns on one Embodiment of this invention from the lower side. The plan view which showed the other opened state of the package which concerns on one Embodiment of this invention from the upper side.

Hereinafter, a package according to an embodiment of the present invention will be described with reference to the drawings.

In the package 1 according to the embodiment of the present invention, as shown in FIGS. 1 to 3, a sheet containing a resin sheet is formed into a tubular body 10, and both open end sides of the tubular body 10 are heat-sealed. It is a gusset-type package that is constructed by sealing with or the like.

Examples of the sheet containing the resin sheet include a laminated sheet obtained by laminating a plurality of sheets including the resin sheet. Examples of the laminated sheet include a three-layer structure laminated sheet including a resin sheet and a four-layer structure laminated sheet including a resin sheet. As the laminated sheet having a three-layer structure, for example, a polyester sheet as a resin sheet is arranged on one surface of an aluminum sheet, and a polyethylene sheet as a resin sheet is arranged on the other surface of the aluminum sheet. Examples of the four-layer structure laminated sheet include a polyethylene sheet as a resin sheet arranged on one side of an aluminum sheet, and a polyethylene sheet as a resin sheet and a polyester sheet as a resin sheet arranged on the other side of the aluminum sheet in this order. .. In the present embodiment, the tubular body 10 is molded so that the polyester sheet serves as the outer layer by using the laminated sheet having the above-mentioned three-layer structure.

In the package 1 according to the present embodiment, the tubular body 10 is formed by sealing the overlapping portions in a state where the end edges of the sheets facing each other are overlapped with each other. As shown in FIG. 3, the seal portion of the tubular body 10 is the back seal portion 20. Further, as shown in FIG. 3, the back seal portion 20 extends along the longitudinal direction of the tubular body 10.
In the following, the side on which the back seal portion 20 is formed is the lower side, the side opposite to this is the upper side, and the direction orthogonal to the direction in which the back seal portion 20 extends (the lateral direction of the tubular body 10). One end side (the front side of the paper surface in FIG. 1) will be described as the right side, and the other end side in the direction orthogonal to the direction in which the back seal portion 20 extends will be described as the left side.
Further, in the following description, from the center line C extending from one end side to the other end side in the longitudinal direction through the center portion in the lateral direction, the direction toward the left and right is the outside, and the direction from both ends in the lateral direction toward the center line C. The direction is inside.

In the package 1 according to the present embodiment, the portion of the tubular body 10 capable of accommodating the object 30 is the accommodating portion 11. In the packaging body 1 according to the present embodiment, the first sealing portion 12 and the second sealing portion are sealed by sealing both open end sides (both end edges in the longitudinal direction of the tubular body 10) of the tubular body 10. 13 is formed.

In the package 1 according to the present embodiment, a laminate of PTP sheets in which a plurality of PTP sheets containing tablets or the like are stored in a pocket is stored in the storage unit 11 as an object to be stored 30.

As shown in FIGS. 1 to 3, in the package 1 according to the present embodiment, the sheet has an opening auxiliary line 11a at the positions of the accommodating portion 11, the first sealing portion 12, and the second sealing portion 13. I have. That is, the opening auxiliary line 11a extends from one end edge to the other end edge of the package 1. As described above, since the opening auxiliary line 11a extends from one end edge to the other end edge of the package 1 in the longitudinal direction, it is on either side of the first sealing portion 12 side or the second sealing portion 13 side. The package 1 can also be opened from. In addition, opening along the opening auxiliary line 11a can be performed relatively easily. The opening auxiliary line 11a is a line processed so that it can be easily cleaved as compared with other parts. In the present embodiment, the sheet is provided with an opening auxiliary line 11a on the outer surface. The opening auxiliary line 11a extends along the direction in which the back seal portion 20 extends (longitudinal direction of the tubular body 10). As described above, since the opening auxiliary line 11a is along the direction in which the back seal portion 20 extends on the outer surface of the sheet, in the package 1 according to the present embodiment, the direction in which the back seal portion 20 extends is the opening direction. It has become. In the package 1, the sheet is provided with opening auxiliary lines 11a at positions facing each other. In the present embodiment, the sheet has two opening auxiliary lines 11a at opposite positions of two outer surfaces (upper and lower outer surfaces) facing each other. As a result, it is possible to suppress the displacement of the opening position from the opening auxiliary line 11a on the upper and lower surfaces, respectively. In the present embodiment, since the tubular body 10 is molded so that the polyester sheet serves as the outer layer using the laminated film having the above-mentioned three-layer structure, the opening auxiliary line 11a is the polyester which is the outer layer. It is formed on a sheet. Examples of the opening auxiliary line 11a include a half-cut line formed by a laser, a perforation, and the like.

The opening auxiliary line 11a has a curved portion 11a1 that is bent toward the center side (inside) of the package 1. In the package 1 according to the present embodiment, the opening auxiliary line 11a has a plurality of curved portions 11a1. Further, the opening auxiliary line 11a is arranged outside the center line C (on the right side in FIG. 1).

In general, the force applied by the opener at the time of opening the gusset type package 1 often has a relatively large component of the force toward the outside of the tubular body 10. However, in the package 1 according to the present embodiment, the opening auxiliary line 11a has a curved portion 11a1 that is curved toward the center line C side, that is, a curved portion that is curved toward the inside of the tubular body 10. Since it has 11a1, the curved portion 11a1 becomes a resistance at the time of opening. Therefore, the opening speed of the package 1 can be reduced in the curved portion 11a1. As a result, it is possible to prevent the opening from being continued at a position deviated from the opening auxiliary line 11a (specifically, outside the opening auxiliary line 11a).

In the present embodiment, in order to facilitate opening of the sheets between the adjacent curved portions 11a1, the end edge portions 11a1a of the adjacent curved portions 11a1 of the opening auxiliary line 11a are opened in the opening direction (the back seal portion 20 is provided). It is connected by a straight portion 11a2 extending in the extending direction).

In this embodiment, three opening auxiliary lines 11a are provided. These opening auxiliary lines 11a are arranged so that the positions of the curved portions 11a1 on each opening auxiliary line 11a overlap each other, and in a direction orthogonal to the direction in which the back seal portion 20 extends (horizontal direction (short side of the tubular body 10)). It is arranged at intervals in the direction)).

The angle formed by the curved portion 11a1 and the straight portion 11a2 on the upstream side in the opening direction may be 20 ° or more and 50 ° or less. That is, the angle formed by the straight portion 11a2 and the curved portion 11a1 on the upstream side in the opening direction via the edge portion may be 20 ° or more and 50 ° or less inward with respect to the extension direction of the straight portion 11a2. In the present embodiment, the angle formed by the curved portion 11a1 and the straight portion 11a2 on the upstream side in the opening direction is 30 °.

The curved portion 11a1 may have a radius of curvature of the tip portion on the center side (tip portion on the center line C side) of 0 mm or more and 11.5 mm or less. In the present embodiment, as described above, in the present embodiment, the plurality of curved portions 11a1 have a radius of curvature of 2 mm at the tip portion on the central side.

Here, as the value of the radius of curvature of the central tip of the curved portion 11a1 is increased, the central tip of the curved portion 11a1 changes from a sharp shape to a gentle shape. It is considered that when the tip portion on the center side of the curved portion 11a1 has a gentle shape, it becomes easy to open the package along the curved portion 11a1. Therefore, even when the angle formed by the curved portion 11a1 and the straight portion 11a2 is relatively large, the value of the radius of curvature of the central tip portion of the curved portion 11a1 is increased (for example, the curved portion 11a1 and the straight portion 11a1). When the angle formed with 11a2 is 50 ° (by setting the radius of curvature of the central tip of the curved portion 11a1 to 11.5 mm), it is considered that the opening is facilitated along the opening auxiliary line 11a.

Further, in order to impart an appropriate opening resistance by the curved portion 11a1, three or more curved portions 11a1 may be arranged per 10 cm of the opening auxiliary line 11a. In the present embodiment, as shown in FIGS. 1 to 3, five curved portions 11a1 are arranged per 10 cm of the opening auxiliary line 11a.

The first sealing portion 12 has an opening starting point 12b which is a starting point when the packaging body 1 is opened on the end edge 12a side which is not connected to the accommodating portion 11. A plurality of opening starting points 12b are periodically arranged on the edge 12a side. Therefore, when the package 1 is opened, any one of these opening starting points 12b can be used as the starting point.

In the present embodiment, as described above, since the curved portion 11a1 is bent toward the center line C, the shape of the curved portion 11a1 is a shape that hinders opening from the second sealing portion 13 side. No. Therefore, the package 1 can be opened from the second sealing portion 13 side as well. From this, the second sealing portion 13 is also placed on the edge 13a side, which is not connected to the accommodating portion 11, like the first sealing portion 12, so that the seal can be opened from the second sealing portion 13 side as well. It has an opening opening point 13b, which is a starting point when the packaging body 1 is opened. A plurality of opening starting points 13b are also periodically arranged on the edge 13a side which is not connected to the accommodating portion 11. Therefore, when opening the package 1, one of these opening starting points 13b can be used as the starting point.

In the package 1 according to the present embodiment, opening is performed along any of the three opening auxiliary lines 11a. In the package 1 according to the present embodiment, preferably, as shown in FIGS. 4 and 5, along the opening auxiliary line 11a on the side closest to the center line C among the three opening auxiliary lines 11a. The package 1 is opened. By opening along the opening auxiliary line 11a, an opening 14 for taking out the laminated body of the PTP sheet, which is the contained object 30, is formed.
Further, since the package 1 according to the present embodiment is provided with three opening auxiliary lines 11a as described above, when opening is performed along the opening auxiliary line 11a closest to the center line C. In addition, for example, as shown in FIG. 9, even when the opening position is displaced outward from the opening auxiliary line 11a closest to the center line C, the opening auxiliary line 11a formed further outward by the opener. It is possible to open the package according to. Therefore, it is possible to more sufficiently prevent the opening of the package 1 from being completed in a state where a part of the package 1 is cut off at a position in the middle of opening the package 1.

The package 1 configured as described above is formed into a tubular body 10 having a back seal portion 20 by sealing the overlapping portion in a state where the end edges of the sheets containing the resin sheet facing each other are overlapped with each other. In a state where a laminated body of PTP sheets, which are 30 objects to be contained, is housed in the tubular body 10, both end edges of the tubular body 10 in the direction in which the back seal portion 20 extends are sealed with a heat seal or the like, and the back seal portion is formed. It can be obtained by forming opening auxiliary lines 11a at positions facing each other of the sheets along the direction in which 20 extends.

Next, an example of opening the package 1 according to the present embodiment will be described with reference to FIGS. 4 to 8. Hereinafter, an example of opening the package 1 from the first sealing portion 12 side along the opening auxiliary line 11a closest to the center line C among the three opening auxiliary lines 11a will be described.

When opening the package 1 according to the present embodiment, preferably, the package is packaged from the opening opening point 12b on the side closest to the opening auxiliary line 11a on the center line C side of the opening starting points 12b of the first sealing portion 12. Start opening body 1. Specifically, the opening is started by applying a force in the opening direction (the direction in which the back seal portion 20 extends) from the opening starting point 12b on the side closest to the opening auxiliary line 11a on the center line C side.

The opening position of the package 1 is reached to the opening auxiliary line 11a on the most center line C side, and as shown in FIGS. 6 and 7, the opening position of the package 1 is along the opening auxiliary line 11a on the most center line C side. Continue opening.
As described above, in the package 1 according to the present embodiment, since the opening auxiliary line 11a has a curved portion 11a1 that is curved toward the center line C, the curved portion 11a1 has a resistance at the time of opening. Become. As a result, the opening speed of the package 1 can be reduced in the curved portion 11a1, so that the opening along the opening auxiliary line 11a is continued.
In the package 1 according to the present embodiment, since the sheet is provided with opening auxiliary lines 11a at opposite positions (upper and lower outer surfaces) facing each other, as shown in FIG. On the lower side of the package 1, the opening of the package 1 is continued along the opening auxiliary line 11a on the most center line C side as well as the upper side.

By continuing the opening to the second sealing portion 13 side of the package 1, as shown in FIGS. 14 is formed.
The person who opened the package 1 can take out the laminated body of the PTP sheet, which is the object to be packed 30, from the opening 14 having such a sufficient size.

The package according to the present invention is not limited to the configuration of the above embodiment. Further, the package according to the present invention is not limited by the above-mentioned effects. The package according to the present invention can be modified in various ways without departing from the gist of the present invention.

In the above embodiment, an example in which the sheet is provided with the opening auxiliary line 11a on the upper and lower outer surfaces of the accommodating portion 11, the first sealing portion 12, and the second sealing portion 13 has been described. The example provided with 11a is not limited to this. The sheet may be provided with an opening auxiliary line 11a at least on the outer surface of either the upper side or the lower side of the accommodating portion 11.

In the above embodiment, an example in which three opening auxiliary lines 11a are provided has been described, but the number of opening auxiliary lines 11a is not limited to this. The number of opening auxiliary lines 11a may be one, or may be more than three.

In the above embodiment, the three opening auxiliary lines 11a are oriented so that the positions of the curved portions 11a1 on each opening auxiliary line 11a overlap each other, and the direction orthogonal to the direction in which the back seal portion 20 extends (left-right direction (left-right direction)). An example in which the tubular body 10 is arranged at intervals)) has been described, but the example in which the three opening auxiliary lines 11a are arranged is not limited to this. The three opening auxiliary lines 11a are arranged so that the positions of the curved portions 11a1 on each opening auxiliary line 11a do not overlap each other, and are spaced apart from each other in a direction orthogonal to the direction in which the back seal portion 20 extends. You may.

In the above embodiment, an example in which the angle formed by the curved portion 11a1 between the curved portion 11a1 and the straight portion 11a2 is 30 ° and the radius of curvature of the central tip portion is 2 mm has been described, but the shape of the curved portion 11a1 has been described. Is not limited to this. The curved portion 11a1 may be bent so as to form a triangular shape toward the center line C. The curved portion 11a1 may be bent so as to form an arc toward the center line C. The curved portion 11a1 may be bent so as to form a trapezoid toward the center line C. Alternatively, the curved portion 11a1 may be a combination of the curved portions of each of the above shapes.

In the above embodiment, an example in which the contained object 30 is a laminated body of PTP sheets has been described, but the contained object 30 is not limited to the laminated body of PTP sheets. One PTP sheet may be used as the object to be contained 30. Alternatively, a material other than the PTP sheet may be used as the object to be contained 30.

In the above embodiment, an example in which the sheet is provided with the opening auxiliary line 11a on the outer surface has been described, but the example in which the sheet is provided with the opening auxiliary line 11a is not limited to this. The sheet may be provided with an opening auxiliary line 11a on the inner surface.

Hereinafter, the present invention will be described in more detail with reference to test examples.

(Effect of the shape of the opening auxiliary line)
Opening auxiliary lines were formed on the upper and lower outer surfaces of the sheet in the gusset-type package in which the contents to be contained were relatively tightly contained as follows. The opening auxiliary line was a half-cut line formed by a laser.

-Sample 1: Three straight opening auxiliary lines are formed along the opening direction of the gusset type package and at intervals in the direction orthogonal to the opening direction.
-Sample 2: A gusset of an opening auxiliary line (hereinafter referred to as an opening auxiliary line having a curved portion) having a plurality of curved portions curved toward the center and adjacent curved portions connected by a straight line portion. Three pieces are formed along the opening direction of the mold package and at intervals in the direction orthogonal to the opening direction.

In Sample 2, the angle formed by the curved portion and the straight portion on the upstream side in the opening direction was set to 30 °, and the radius of curvature of the tip portion on the center side of the curved portion was set to R2. R2 means that the radius of curvature R is 2 mm.
Further, in sample 2, five curved portions were arranged per 10 cm of the opening auxiliary line.
The openability of 5 samples of the gusset type package according to Samples 1 and 2 was confirmed. The results are shown in Table 1 below. In the following, the number of opened packages means the number of packages that can be opened without cutting off a part of the gusset-shaped package in the middle of opening when the gusset-shaped package is opened from one end side to the other end edge side. ..

It was confirmed that the gusset-type package related to sample 1 in which the opening auxiliary line consists of three straight lines could be opened without cutting off a part of the gusset-type package in the middle of opening 3 of the 5 samples. rice field. On the other hand, the gusset-type package of sample 2 having the bent portion and the opening auxiliary line formed could be opened without cutting off a part of the gusset-type package at the position in the middle of opening all five samples. confirmed.

(Effect of the angle between the curved part and the straight part)
An opening auxiliary line having a curved portion was formed so that the angle formed by the curved portion and the straight portion on the upstream side in the opening direction had the following values. Further, in each of the following samples, the radius of curvature of the tip portion on the center side of the curved portion was set to R2. As in the case of sample 2, three opening auxiliary lines having curved portions were formed.

・ Sample 3: 20 °
・ Sample 4: 40 °
・ Sample 5: 50 °

In Samples 3 to 5, five curved parts were arranged per 10 cm of the opening auxiliary line.
The openability of 5 samples of the gusset type package according to Samples 3 to 5 was confirmed. The results are shown in Table 2 below.

The gusset-type package of sample 3 having an angle of 20 ° and the gusset-type package of sample 4 having an angle of 40 ° are part of the gusset-type package in the middle of opening in all five samples. It was confirmed that the package could be opened without being cut off. Further, it was confirmed that 4 out of 5 samples of the gusset type package according to the sample 5 having an angle of 50 ° could be opened without cutting off a part of the gusset type package at the position in the middle of opening.

(Effect of radius of curvature R)
An opening auxiliary line having a curved portion having a radius of curvature R of the tip portion on the central side having the following value was formed. In each of the following samples, three opening auxiliary lines were formed in the same manner as in sample 1. In each of the following samples, the angle formed by the curved portion and the straight portion on the upstream side in the opening direction was set to 30 °.
In the following samples, R0, R1, R7.5 and R11.5 mean that the radii of curvature R are 0 mm, 1 mm, 7.5 mm and 11.5 mm, respectively.

-Sample 6: R0
-Sample 7: R1
-Sample 8: R7.5
-Sample 9: R11.5

In Samples 6 to 9, five curved parts were arranged per 10 cm of the opening auxiliary line.
The openability of 5 samples of the gusset type package according to Samples 6 to 9 was confirmed. The results are shown in Table 3 below.

It was confirmed that the gusset-type packages related to the samples 6 to 9 can be opened without cutting off a part of the gusset-type packages at the position during opening of all five samples.

1 Package,
10 tubular body, 11 accommodating part, 12 first sealing part, 13 second sealing part, 14 openings,
11a opening auxiliary line, 11a1 curved part, 11a1a edge part, 11a2 straight part,
12a edge, 12b opening starting point, 13a edge, 13b opening starting point,
20 Back seal part,
30 Containment,
C center line.

Claims (5)

A packaging body having an accommodating portion composed of sheets.
The sheet is provided with an opening auxiliary wire processed for easy opening.
The opening auxiliary line has a plurality of curved portions that are bent so as to protrude toward the center side.
The edge portions of the curved portions adjacent to each other of the opening auxiliary wire are connected by a straight portion.
Packaging body. The sheet includes the opening auxiliary lines at positions facing each other.
The package according to claim 1. The angle formed by the curved portion and the straight portion on the upstream side in the opening direction is 20 ° or more and 50 ° or less.
The package according to claim 1 or 2. The curved portion has a radius of curvature of 0 mm or more and 11.5 mm or less at the tip portion on the central side.
The package according to any one of claims 1 to 3. Three or more bent portions are arranged per 10 cm of the opening auxiliary line.
The package according to any one of claims 1 to 4.

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