JP7261035B2 - Bag film and packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bag film and a packaging bag.

BACKGROUND ART Conventionally, a packaging bag is known in which two films are laminated and the ends are sealed. Packaging bags are used to contain foods and medicines. In some cases, the packaging bag body is formed with a line of cut lines that is made up of a plurality of cut lines for facilitating unsealing. If the line of cuts is formed at the same height position on the front and back surfaces of the packaging bag, the opening ends of the packaging bag after opening are aligned on the front and back surfaces of the packaging bag. There is a problem that when the packaging bag body is tightly closed, it becomes difficult to take out the packaged item accommodated in the packaging bag body.

In response to such problems, Patent Document 1 discloses a packaging bag in which cut lines inclined with respect to the unsealing direction are formed such that one of the front and back surfaces of a packaging bag is inclined upward and the other is inclined downward. A bag has been proposed. According to the packaging bag of Patent Document 1, the positions of the opening lines formed at the time of opening can be guided to different heights on the front surface and the back surface. As a result, a grip portion that can be pinched with fingers is formed in the opening formed after opening, and the opening can be easily opened using this grip portion.

Japanese Patent No. 4648605

However, since the packaging bag of Patent Document 1 forms the first and second cut lines inclined in the direction opposite to the guiding direction of the unsealing line, the stress in the direction opposite to the unsealing direction acts, and the open end The package was jagged and could not be opened smoothly, which made the person who opened the package feel uncomfortable.
In addition, assuming that the first and second cut lines are straight and parallel to each other, the perforations of the third cut line are inclined in a certain direction, so the opening is difficult. When doing so, it is conceivable that the opening line may go straight between the perforations that constitute the first or second cut line, and the package cannot be opened along the first or second cut line.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bag film and a packaging bag that can be opened more easily and have clean opening end surfaces.

The bag film and the packaging bag of the present invention have the following configurations.
[1] A quadrilateral in plan view, having a cleaved portion extending along the arbitrary side at a position spaced apart from the arbitrary side by a predetermined distance, and the cleaved portion is along the arbitrary side A first cut strip consisting of one or more first cut strips extending therefrom and a second cut strip consisting of one or more second cut strips extending along the first cut strip spaced from the first cut strip. a guide cut strip consisting of one or more guide cut rows positioned between the first cut strip and the second cut strip and extending along the first cut strip; a first relief score band located between one score score and said guide score band and consisting of one or more first rows of relief score extending along said first score band; and said second score line. a second strip of relieved cuts located between the strip and said guide strip of cuts and consisting of one or more rows of second relieved cuts extending along said second cut strip; The row is formed of one or more first cut lines extending in the extending direction of the first cut row, and the second cut row is formed of one or more cut lines extending in the extending direction of the second cut row It is formed by a second cut line, the guide cut line is formed by two or more guide cut lines inclined at an arbitrary angle with respect to the extending direction of the guide cut line, and the first relaxation cut line is , formed by two or more first relaxation cut lines inclined in the same direction as the guide cut line, and the second relaxation cut row is formed by two or more second relaxation cut lines inclined in the same direction as the guide cut line The minor angle formed by the break line and formed by the extending direction of the first relaxation cut line and the first relaxation cut line is the minor angle formed by the extending direction of the guide cut line and the guide cut line. is smaller than the minor angle formed by the extending direction of the second relaxation cut line and the second relaxation cut line is less than the inferior angle formed by the extending direction of the guide cut line and the guide break line. Small film for bags.
[2] The bag film according to [1], wherein the first slit band has two or more first slit rows.
[3] The bag film according to [1] or [2], wherein the second slit band has two or more second slit rows.
[4] The bag film according to any one of [1] to [3], wherein the guide slit band has two or more guide slit rows.
[5] The bag film according to any one of [1] to [4], wherein the first relief cut band has two or more first relief cut rows.
[6] The bag film according to any one of [1] to [5], wherein the second relief cut band has two or more second relief cut rows.
[7] The magnitude of the minor angle formed by the extending direction of the first relaxation cut line and the first relaxation cut line, the extending direction of the second relaxation cut line and the second relaxation cut line The bag film according to any one of [1] to [6], wherein the magnitude of the minor angle between and is equal.
[8] The bag film according to any one of [1] to [7], which has a first surface portion and a second surface portion facing the first surface portion, and the first surface portion is the film for bags according to any one of [1] to [7]. and the second surface portion is formed of the bag film according to any one of [1] to [7], and the split portion of the first surface portion and the second surface portion of the and a tearing portion, and the guiding score line of the second surface portion is inclined in a direction opposite to the guiding score line of the first surface portion.
[9] The packaging bag according to [8], which is a three-sided seal bag having a folded edge perpendicular to the extending direction of the first line of cuts on the first surface.
[10] The packaging bag according to [8] or [9], which has two split portions, and the two split portions are formed along two adjacent sides.

According to the bag film and the packaging bag of the present invention, the minor angle formed by the extending direction of the first relief cut line and the first relief cut line is the extending direction of the guide cut line and the guide cut line. Since it is less than the minor angle with the line, the tear line is guided to the first or second cut strip while changing its direction of travel. In addition, according to the bag film and the packaging bag of the present invention, the minor angle formed by the extending direction of the second relief cut line and the second relief cut line is the extending direction of the guide cut line. is smaller than the minor angle formed by the leading score line and the opening line, the opening line is guided to the first or second score band while changing its traveling direction. As a result, the first or second cut band can be reliably torn, the package can be opened more easily, and the opening end face can be cleaned.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view showing an embodiment of the bag film of the present invention; FIG. 2 is an enlarged plan view of the bag film of FIG. 1; 1 is a plan view showing an embodiment of a packaging bag of the present invention; FIG. FIG. 4 is an enlarged developed view of the packaging bag of FIG. 3; FIG. 4 is an enlarged sectional view of the packaging bag of FIG. 3; FIG. 4 is a plan view showing another embodiment of the packaging bag of the present invention;

In the present specification, the "cut line" is formed by processing the film for a bag into a straight or perforated cut line. As a result, the bag film can be easily cut without using a cutting tool such as scissors. In addition, the processing of linear cuts means that linear grooves are continuously formed in the bag film with a slight thickness left. The perforation-like cut processing is to continuously form slits or grooves at predetermined intervals in the bag film. A "slit row" refers to an aggregate of slit lines extending in the direction in which an imaginary line connecting midpoints of the slit lines extends. A "cut band" refers to a collection of cut rows.
In the present specification, the term "opening line" refers to the edge of the cut formed when tearing the bag film.

[Bag film]
The bag film of the present invention is rectangular in plan view, and has a split portion extending along the arbitrary side at a position spaced apart from the arbitrary side by a predetermined distance.
The bag film of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a bag film 1 (hereinafter also referred to as film 1) has a quadrangular shape in plan view, and is spaced apart from one side A at a predetermined distance _HA along one side A. It has an extending cleft B. Each side of the film 1 may be partially curved.
Cleavage B has a first cut strip 10 , a second cut strip 20 , a guide cut strip 30 , a first relief cut strip 40 and a second relief cut strip 50 . Cleavage portion B is a quadrangular region in plan view, surrounded by two sides perpendicular to side A of film 1, first cut band 10, and second cut band 20. As shown in FIG. One side A and the first cut band 10 are parallel. The first cut strip 10, the second cut strip 20, the guiding cut strip 30, the first relief cut strip 40, and the second relief cut strip 50 are each parallel to one another. In this specification, "parallel" means that the minor angle between two straight lines is 0 to 5°.
In FIG. 1, the first cut strip 10, the second cut strip 20, the guiding cut strip 30, the first relief cut strip 40, and the second relief cut strip 50 are represented by solid lines for convenience. there is

One side A of the film 1 extends in the +X direction. Cleavage portion B is formed at a position spaced apart from one side A in the -Y direction at a predetermined interval _HA . The interval H _A is not particularly limited, and is preferably 5 to 50 mm, more preferably 10 to 30 mm, for example. When the interval _HA is equal to or greater than the above lower limit, it is easy to secure a region where a seal portion is formed when the film 1 is heat-sealed to form a bag. When the interval _HA is equal to or less than the above upper limit, it is easy to reduce the portion of the film 1 that is discarded when the package is opened.
The length _HB of the cleavage portion B in the Y direction is not particularly limited, and is preferably 5 to 50 mm, more preferably 10 to 30 mm, for example. When the length _HB is equal to or greater than the above lower limit, it is easy to appropriately secure regions for forming the guide cut band 30, the first relief cut band 40, and the second relief cut band 50. When the length _HB is equal to or less than the above upper limit, the tear portion B can be made small, and the portion of the film 1 that is discarded when the film is opened can be easily reduced.

The length _L1 of the film 1 in the X direction is not particularly limited, and is preferably 80 mm or more, more preferably 100 mm or more. When the length _L1 is at least the above lower limit, it is easy to manufacture a packaging bag from the film 1 . The upper limit of the length _L1 is not particularly limited, and the roll-shaped film 1 is included. The film 1 may be cut to any length in the +Y direction, for example with a length _L1 of 500 mm.
The length H ₁ of the film 1 in the Y direction is not particularly limited, and is preferably 80 to 500 mm, more preferably 100 to 300 mm. When the length _H1 is equal to or greater than the above lower limit value, the cleavage portion B is easily formed in the film 1 . It is easy to manufacture the film 1 as length _H1 is below the said upper limit.

FIG. 2 shows an enlarged plan view of the film 1 of FIG. As shown in FIG. 2, the first score strip 10 has two first score rows 10a and 10b. The first cut row 10b is located closer to one side A than the first cut row 10a. The first cut line 10a and the first cut line 10b extend along one side A, respectively. The first score line 10a is formed of first score lines 12a with a width _W12a of one or more. The first cut lines 12a are formed at intervals L _12a in the X direction. The first cut line 12a extends in the direction in which the imaginary line _P10a extends. The virtual line _P10a is a straight line connecting the midpoints _M12a of two or more first cut lines 12a. The angle D _12a formed between the virtual line P _10a and the +X direction is 0°. That is, the virtual line _P10a is parallel to the side A.
The width W _12a is not particularly limited, and is preferably 0.3 to 3.0 mm, more preferably 0.8 to 1.5 mm. When the width _W12a is equal to or greater than the above lower limit, the force required to tear the film 1 can be easily reduced. When the width _W12a is equal to or less than the above upper limit value, the strength of the film 1 can be easily maintained. The width _W12a can be measured with a digital vernier caliper or the like.
The interval _L12a is not particularly limited, and is preferably 0.1 to 2.0 mm, more preferably 0.3 to 1.0 mm. When the interval _L12a is equal to or greater than the above lower limit, the strength of the film 1 can be easily maintained. If the interval _L12a is equal to or less than the above upper limit, the force required to tear the film 1 can be easily reduced. The spacing L _12a can be measured in a similar manner as the width W _12a .

The first score line 10b is formed of first score lines 12b with a width _W12b of 1 or greater. The first cut lines 12b are formed at intervals L _12b in the X direction. The first cut line 12b extends in the direction in which the imaginary line _P10b extends. The virtual line _P10b is a straight line connecting the midpoints _M12b of the two or more first cut lines 12b. The angle D _12b formed between the virtual line P _10b and the +X direction is 0°. That is, the virtual line P _10b is parallel to the side A.
Width W _12b is similar to width W _12a , and width W _12b may be the same as or different from width W _12a .
Spacing L _12b is similar to spacing L _12a , and spacing L _12b may be the same as or different from spacing L _12a .

The second score strip 20 has two rows of second score lines 20a and 20b. The second cut line 20b is positioned farther from the side A than the second cut line 20a. The second cut line 20a and the second cut line 20b extend along one side A, respectively. The second row of cuts 20a is formed of second cut lines 22a with a width W _22a of 1 or more. The second cut lines 22a are formed at intervals L _22a in the X direction. The second cut line 22a extends in the direction in which the imaginary line _P20a extends. The virtual line P _20a is a straight line connecting the midpoints M _22a of two or more second cut lines 22a. The angle D _22a formed between the virtual line P _20a and the +X direction is 0°. That is, the virtual line _P20a is parallel to the side A.
Width W _22a is similar to width W _12a , and width W _22a may be the same as or different from width W _12a .
Spacing L _22a is similar to spacing L _12a , and spacing L _22a may be the same as or different from spacing L _12a .

The second score line 20b is formed of second score lines 22b with a width W _22b of 1 or more. The second cut line 22b is formed with an interval L _22b in the X direction. The second cut line 22b extends in the direction in which the imaginary line _P20b extends. The virtual line P _20b is a straight line connecting the midpoints M _22b of two or more second cut lines 22b. The angle D _22b formed between the virtual line P _20b and the +X direction is 0°. That is, the virtual line P _20b is parallel to the side A. Width W _22b is similar to width W _22a , and width W _22b may be the same as or different from width W _22a . Spacing L _22b is similar to spacing L _22a , and spacing L _22b may be the same as or different from spacing L _22a .

Between the first cut strip 10 and the second cut strip 20 is located a guiding cut strip 30 . The guide cut strip 30 has two rows of guide cuts 30a and 30b. The guiding cut line 30b is located on the side farther from the side A than the guiding cut line 30a. The guiding cut line 30a and the guiding cut line 30b extend along one side A, respectively. The row of guiding cuts 30a is formed of guiding cut lines 32a with a width W _32a of 2 or more. The guide cut lines 32a are formed at intervals L _32a in the X direction. Guiding cut line 32a extends in the direction in which imaginary line P _30a extends. The virtual line P _30a is a straight line connecting midpoints M _32a of two or more guiding cut lines 32a. The guiding break line 32a is inclined at an arbitrary angle D _32a with respect to the imaginary line P _30a .
The angle D _32a is, for example, preferably 30-60°, more preferably 30-45°. When the angle D _32a is equal to or greater than the above lower limit value, it is easy to reliably guide the opening line formed when the film 1 is torn to the first cut band 10 or the second cut band 20 . Note that when the film 1 is torn in the +X direction, the tear line is deflected in the -Y direction and guided to the second cut band 20 . When tearing the film 1 in the −X direction, the tear line is deflected in the +Y direction and directed to the first score strip 10 . When the angle D _32a is equal to or less than the above upper limit, the opening line formed when tearing the film 1 can be smoothly guided to the first relaxation cut band 40 or the second relaxation cut band 50, and the opening end face can be cleaned. Easy to use. The angle D _32a can be measured by a digital goniometer or the like.
Width W _32a is similar to width W _12a , and width W _32a may be the same as or different from width W _12a .
The interval L _32a is not particularly limited, and is preferably 0.2 to 2.0 mm, more preferably 0.5 to 1.5 mm. It is easy to maintain the strength of the film 1 as the interval L _32a is equal to or more than the above lower limit. When the interval L _32a is equal to or less than the above upper limit, the force required to tear the film 1 can be easily reduced. The spacing L _32a can be measured in a similar manner as the width W _12a .

The row of guide cuts 30b is formed of guide cut lines 32b with a width W _32b of 2 or more. The guiding cut lines 32b are formed at intervals L _32b in the X direction. Guiding cut line 32b extends in the direction in which imaginary line P _30b extends. The virtual line P _30b is a straight line connecting midpoints M _32b of two or more guiding cut lines 32b. The guide cut line 32b is inclined at an arbitrary angle D _32b with respect to the imaginary line P _30b . Angle D _32b is similar to angle D _32a , and angle D _32b may be the same as or different from angle D _32a .
Width W _32b is similar to width W _32a , and width W _32b may be the same as or different from width W _32a .
Spacing L _32b is similar to spacing L _32a , and spacing L _32b may be the same as or different from spacing L _32a .

Between the first cut strip 10 and the guiding cut strip 30 is a first relief cut strip 40 . The first relief score band 40 consists of a first row of relief scores 40 a extending along the first score band 10 . The first row of relief cuts 40a is formed of first relief score lines 42 with a width W ₄₂ of 2 or more. The first relief score lines 42 are formed at intervals L ₄₂ in the X direction. A first relaxation cut line 42 extends in the direction in which imaginary line P _40a extends. The imaginary line P _40a is a straight line connecting the midpoints M ₄₂ of two or more first relief cut lines 42 . The first relief score line 42 is inclined at an angle D ₄₂ with respect to the imaginary line P _40a in the same direction as the guiding score line 32a.
The angle D ₄₂ is less than the tilt angle D 32a of the guiding score line _32a and less than the tilt angle D _32b of the guiding score line 32b. The angle D ₄₂ is, for example, preferably 10-30°, more preferably 15-25°. When the angle D ₄₂ is equal to or greater than the above lower limit, it is easy to reliably guide the opening line formed when the film 1 is torn to the first slit band 10 . In this case, the direction in which the film 1 is cleaved is the -X direction. When the angle D ₄₂ is equal to or less than the above upper limit, it is easy to prevent the opening line from deviating in the Y direction from the first slit band 10, and it is easy to clean the opening end face. Angle D ₄₂ can be measured in a similar manner as angle D _32a .
Width W ₄₂ is similar to width W _12a , and width W ₄₂ may be the same as or different from width W _12a .
The interval L ₄₂ is not particularly limited, and is preferably 0.2 to 2.0 mm, more preferably 0.5 to 1.0 mm. When the interval L ₄₂ is equal to or greater than the above lower limit, the strength of the film 1 can be easily maintained. When the interval L ₄₂ is equal to or less than the upper limit, the force required to tear the film 1 can be easily reduced. Spacing L ₄₂ can be measured in a similar manner as width W _12a .

Between the second cut strip 20 and the guiding cut strip 30 is a second relief cut strip 50 . The second relief score band 50 consists of a second row of relief scores 50 a extending along the second score band 20 . The second row of relief scores 50a is formed of second relief score lines 52 with a width W ₅₂ of 2 or more. A second relief score line 52 is formed at a spacing L ₅₂ in the X direction of the figure. The second relaxation cut line 52 extends in the direction in which the imaginary line P _50a extends. The imaginary line P _50a is a straight line connecting midpoints M ₅₂ of two or more second relief cut lines 52 . The second relief score line 52 is inclined at an angle D ₅₂ with respect to the imaginary line P _50a in the same direction as the guiding score line 32b.
The angle D ₅₂ is less than the tilt angle D _30a of the guiding score line 32a and less than the tilt angle D _32b of the guiding score line 32b. The angle D ₅₂ is, for example, preferably 10-30°, more preferably 15-25°. When the angle D ₅₂ is equal to or greater than the above lower limit, it is easy to reliably guide the opening line formed when the film 1 is torn to the second cut band 20 . In this case, the direction in which the film 1 is cleaved is the +X direction. When the angle D ₅₂ is equal to or less than the above upper limit, it is easy to prevent the opening line from deviating in the -Y direction from the second cut band 20, and it is easy to clean the opening end face. Angle D ₅₂ may be the same as angle D ₄₂ or may be different. However, the angle _D52 is preferably the same as the angle _D42 from the viewpoint of making the stress applied to the film 1 uniform and facilitating clean opening end faces. Angle D ₅₂ can be measured in a similar manner as angle D ₄₂ .
Width W ₅₂ is similar to width W ₄₂ and width W ₅₂ may be the same as or different from width W ₄₂ .
Spacing L ₅₂ is similar to spacing L ₄₂ and spacing L ₅₂ may be the same as or different from spacing L ₄₂ .

The length _HB of the cleavage portion B in the Y direction is equal to the distance between the first cut line 10b and the second cut line 20b.
The interval _H12 between the first cut line 10a and the first cut line 10b is not particularly limited, and is preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.8 mm. When the interval _H12 is equal to or greater than the lower limit value, it is easy to suppress deviation of the opening line in the +Y direction from the first cut line 10b. When the interval _H12 is equal to or less than the above upper limit, the length _HB of the split portion B in the Y direction can be shortened, and the portion of the film 1 that is discarded due to opening can be easily reduced. The spacing H ₁₂ can be measured in a similar manner as the width W _12a .
The first cut line 12b is preferably formed at a position corresponding to the position where the interval _L12a of the first cut line 12a is formed. By forming the first cut line 12b in this way, it becomes easier to trap the opening line deviating from the first cut line 10a in the +Y direction with the first cut line 12b, and the opening line is the first cut line. It is easier to suppress deviation in the +Y direction than 10b. Thus, the first score strip 10 of the film 1 preferably has two or more first score rows.

The interval _H22 between the second cut row 20a and the second cut row 20b is the same as the interval _H12 , preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.8 mm. When the interval H ₂₂ is equal to or greater than the lower limit value, it is easy to prevent the opening line from deviating in the -Y direction from the second cut row 20b. When the interval _H22 is equal to or less than the above upper limit, the length _HB of the tear portion B in the Y direction can be shortened, and the portion of the film 1 that is discarded due to opening can be easily reduced. Spacing _H22 can be measured in a similar manner as spacing _H12 .
The second cut line 22b is preferably formed at a position corresponding to the position where the interval L _22a of the second cut line 22a is formed. By forming the second cut line 22b in this way, the opening line deviating from the second cut line 20a in the -Y direction is easily trapped by the second cut line 22b, and the opening line is the second cut line. It is easier to suppress deviation in the -Y direction than in row 20b. Thus, the second score strip 20 of the film 1 preferably has two or more second score rows.

The interval H ₄₂ between the first relief cut band 40 and the first cut row 10a is not particularly limited, and is preferably 0.2 to 2.0 mm, more preferably 0.5 to 1.0 mm. It is easy to maintain the strength of the film 1 as the interval H ₄₂ is equal to or more than the above lower limit. When the interval _H42 is equal to or less than the above upper limit value, the opening line can be more reliably guided to the first cut line 10a, and the opening end face can be easily cleaned. Here, the interval H ₄₂ is the distance between one end of the first relief cut line 42 closer to the +Y direction and the first cut line 10a. Spacing H ₄₂ can be measured in a similar manner as spacing H ₁₂ .
The spacing H ₅₂ between the second relief cut band 50 and the second cut row 20a is the same as the spacing H ₄₂ , preferably 0.2 to 2.0 mm, more preferably 0.5 to 1.0 mm. When the interval _H52 is at least the above lower limit, the strength of the film 1 can be easily maintained. When the interval _H52 is equal to or less than the above upper limit value, the opening line can be more reliably guided to the second cut row 20a, and the opening end face can be easily cleaned. Here, the interval H ₅₂ is the distance between one end of the second relief cut line 52 closer to the -Y direction and the second cut line 20a. Spacing H ₅₂ can be measured in a similar manner as spacing H ₄₂ .

The interval H ₄₃ between the row of guiding cuts 30a and the first relief cut band 40 is not particularly limited, and is preferably 0 to 1.5 mm, more preferably 0 to 1.0 mm. When the interval H ₄₃ is equal to or greater than the above lower limit value, the guiding cut line 32a and the first relaxing cut line 42 are likely to be formed more reliably. When the interval H ₄₃ is equal to or less than the above upper limit value, the opening line can be more reliably guided to the first relief cut band 40, and the opening end face can be easily cleaned. Here, the interval H ₄₃ is the distance in the Y direction between one end of the guidance cut line 32a near the +Y direction and one end of the first relaxing cut line 42 near the −Y direction. When the interval H ₄₃ is 0, the position in the Y direction (Y coordinate) between one end of the guidance cut line 32a near the +Y direction and one end of the first relaxation cut line 42 near the −Y direction. are the same. Spacing H ₄₃ can be measured in a similar manner as spacing H ₄₂ .

The spacing H ₅₃ between the row of guiding cuts 30b and the second relief cut band 50 is the same as the spacing H ₄₃ , preferably 0 to 1.5 mm, more preferably 0 to 1.0 mm. If the interval H ₅₃ is equal to or greater than the above lower limit value, the guiding cut line 32b and the second relaxing cut line 52 are likely to be formed more reliably. When the interval _H53 is equal to or less than the above upper limit value, the opening line can be more reliably guided to the second relaxation cut band 50, and the opening end face can be easily cleaned. Here, the interval H ₅₃ is the distance in the Y direction between one end of the guidance cut line 32b near the −Y direction and one end of the second relief cut line 52 near the +Y direction. When the interval H ₅₃ is 0, the position in the Y direction (Y coordinate) between one end of the guidance cut line 32b near the -Y direction and one end of the second relaxation cut line 52 near the +Y direction. are the same. Spacing H ₅₃ can be measured in a similar manner as spacing H ₄₃ .

The interval H ₃₂ between the guiding cut line 30a and the guiding cut line 30b is not particularly limited, and is preferably -0.5 mm to 1.0 mm, more preferably 0 to 0.5 mm. If the interval _H32 is equal to or greater than the above lower limit value, the guiding cut line 32a and the guiding cut line 32b are likely to be formed more reliably. When the interval _H32 is equal to or less than the above upper limit value, the opening line can be more reliably guided to the guide cut line 30a or the guide cut line 30b, and the opening end face can be easily cleaned. Here, the interval H ₃₂ is the distance in the Y direction in the figure between one end of the guiding cut line 32a near the -Y direction and one end of the guiding cut line 32b near the +Y direction. The fact that the interval H ₃₂ is negative means that one end of the guidance cut line 32a near the -Y direction is located closer to the -Y direction than one end of the guidance cut line 32b near the +Y direction. . When the interval H ₃₂ is 0, the position in the Y direction (Y coordinate) of one end of the guidance cut line 32a near the -Y direction and one end of the guidance cut line 32b near the +Y direction is the same. means Spacing H ₃₂ can be measured in a similar manner as spacing H ₄₃ .

The guide score strip 30 may have more than one guide score row. When the guiding cut band 30 of the film 1 has two or more guiding cut rows, the opening line can be reliably guided by the first relief cut band 40 or the second relief cut band 50, and the opening end face can be easily guided. Easy to clean. For this reason, the guide score strip 30 preferably has two or more guide score rows.
The first relief score band 40 may have two or more first relief score rows. When the first relief cut band 40 of the film 1 has two or more first relief cut rows, the opening line can be reliably guided by the first cut band 10, and the opening end face can be easily cleaned. . For this reason, the first relief score band 40 preferably has two or more rows of first relief scores.
The second strip of relief cuts 50 may have two or more rows of second relief cuts. When the second relief cut band 50 of the film 1 has two or more second relief cut rows, the opening line can be reliably guided by the second cut band 20, and the opening end face can be easily cleaned. . For this reason, the second band of relief cuts 50 preferably has two or more rows of second relief cuts.

As shown in FIG. 5, the film 1 is preferably a laminate comprising a substrate 3 and a sealant material 7 .
Examples of the base material 3 include resin films, metal foils, paper, laminates thereof, and the like.
Polyolefins such as polyethylene terephthalate (PET) such as biaxially oriented polyethylene terephthalate (PET), biaxially oriented polypropylene (OPP), non-oriented polypropylene (CPP), high density polyethylene (HDPE), medium density polyethylene (MDPE), etc. , polyamides (PA) such as biaxially oriented nylon (ONY), and laminates thereof. Among them, PET, OPP and nylon (NY) are preferred.
As the substrate 3, a deposited film obtained by depositing a metal such as aluminum or silica on the resin film may be used. Among them, a metal-deposited film obtained by depositing a metal on PET, OPP, or ONY is preferable, and an aluminum-deposited film is more preferable.
Aluminum foil is preferable as the metal foil.
Examples of the laminate include a laminate of the above resin films and a laminate of the above resin film and metal foil.
The base material 3 may be printed on its surface or between layers.
In particular, when a metal foil such as an aluminum foil or a metal-deposited film in which a metal such as aluminum is deposited is used as the base material 3, the oxygen permeability and the water vapor permeability can be further reduced. 3 is preferred.

The thickness T3 of the base material ₃ is determined in consideration of the material, configuration, etc., and is preferably 5 to 100 μm, more preferably 10 to 50 μm. When the thickness _T3 is at least the above lower limit, the strength of the film 1 is likely to be increased. When the thickness _T3 is equal to or less than the above upper limit, the film 1 can be easily handled.

The sealant material 7 preferably consists of three layers, the laminate layer 4 , the oxygen absorbing layer 5 and the sealing layer 6 .
The thickness T ₇ of the sealant material 7 is preferably more than 20 μm and less than 130 μm, more preferably 25-125 μm, still more preferably 30-100 μm, particularly preferably 35-80 μm, most preferably 40-60 μm. When the thickness _T7 exceeds 20 μm, the strength of the film 1 is likely to be increased. When the thickness _T7 is less than 130 μm, the handling of the film 1 tends to be easy.

The laminate layer 4 is preferably a layer containing acid-modified polyolefin and polyolefin. Acid-modified polyolefin has polarity. By making the laminate layer 4 a layer of a mixture of acid-modified polyolefin and polyolefin, the orientation of the laminate layer 4 can be enhanced, and the bag film 1 can be easily torn open. Furthermore, the adhesiveness between the laminate layer 4 and the oxygen absorbing layer 5, which will be described later, is enhanced. In addition, the sealant material 7 can be easily wound into a roll, which facilitates handling.
The content of the acid-modified polyolefin is preferably 20-70% by mass, more preferably 30-70% by mass, and even more preferably 40-60% by mass, relative to the total mass of the laminate layer 4 . When the content of the acid-modified polyolefin is at least the above lower limit, the bag film 1 is more easily split. In addition, the adhesiveness between the laminate layer 4 and the oxygen absorbing layer 5, which will be described later, is enhanced. If the content of the acid-modified polyolefin is equal to or less than the above upper limit value, the sealability and impact resistance are enhanced.
If the content of the acid-modified polyolefin is less than the above lower limit, the adhesiveness between the laminate layer 4 and the base material 3 and the adhesiveness between the laminate layer 4 and the oxygen absorbing layer 5 described later cannot be ensured, so the film 1 breaks. Propagation becomes poor and the film 1 becomes difficult to tear.

The polyolefin is not particularly limited, and examples thereof include polyethylene (PE) such as low density polyethylene (LDPE), linear LDPE (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), biaxially oriented polypropylene ( OPP), polypropylene (PP) such as unstretched polypropylene (CPP), ethylene-propylene copolymer, ethylene-butene-1 copolymer, and the like.
Any one type of polyolefin may be used alone, or two or more types may be used in combination.

Acid-modified polyolefins are obtained by polymerizing polyolefins with unsaturated carboxylic acids or derivatives thereof.
The polyolefin used as the raw material for the acid-modified polyolefin is not particularly limited, and examples thereof include the polyolefins described above.
Examples of unsaturated carboxylic acids used as raw materials for acid-modified polyolefins include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, and anhydrides thereof. Maleic acid, itaconic acid and itaconic anhydride are preferred, and maleic acid or maleic anhydride is more preferred.
As the acid-modified polyolefin, acid-modified polypropylene and acid-modified polyethylene are preferable.
Examples of acid-modified polypropylene include maleic acid-modified polypropylene, maleic anhydride-modified polypropylene, itaconic acid-modified polypropylene, and itaconic anhydride-modified polypropylene.
Examples of acid-modified polyethylene include maleic acid-modified polyethylene, maleic anhydride-modified polyethylene, itaconic acid-modified polyethylene, and itaconic anhydride-modified polyethylene.
Any one of these acid-modified polyolefins may be used alone, or two or more thereof may be used in combination.

The resin constituting the laminate layer 4 is preferably a mixture of acid-modified polypropylene and polypropylene or a mixture of acid-modified polyethylene and polyethylene. Maleic acid-modified polypropylene or maleic anhydride-modified polypropylene is preferable as the acid-modified polypropylene. Maleic acid-modified polyethylene or maleic anhydride-modified polyethylene is preferable as the acid-modified polyethylene. The resin constituting the laminate layer 4 is more preferably maleic acid-modified polyethylene or a mixture of maleic anhydride-modified polyethylene and polyethylene.
By forming the laminate layer 4 from the above mixture, the sealability and impact resistance are likely to be improved, and the film 1 is more easily split. In addition, the adhesiveness to the oxygen absorbing layer 5, which will be described later, is likely to increase.

The laminate layer 4 may contain a lubricant and an antiblocking agent as optional components. The blocking resistance of the sealant material 7 is enhanced by the lamination layer 4 containing a lubricant or an antiblocking agent. In the film 1, when the films 1 are wound or stacked, the films 1 adhere to each other, making it difficult to slip or peel off. This is called blocking. As used herein, blocking resistance refers to the property of preventing blocking.

The lubricant is not particularly limited, and examples thereof include liquid paraffin, microcrystalline wax, natural paraffin, synthetic paraffin, aliphatic hydrocarbon lubricants such as polyethylene, stearic acid, lauric acid, hydroxystearic acid, and fatty acids such as hydrogenated castor oil fatty acid. lubricant, stearamide, oleamide, erucamide, lauric amide, palmitic amide, behenic amide, ricinoleic amide, oxystearic amide, methylene bis stear amide, ethylene bis stear amide, ethylene bis Fatty acid amide-based lubricants such as oleic acid amide, ethylenebisbehenic acid amide, and ethylenebislauric acid amide, metal soap-based fatty acid metal salts having 12 to 30 carbon atoms, such as lead stearate, calcium stearate, and calcium hydroxystearate Lubricants, fatty acid (partial) ester lubricants of polyhydric alcohols such as glycerin fatty acid esters, hydrogenated castor oil, triglycerides of hydroxystearate and sorbitan fatty acid esters, long-chain ester waxes having 8 to 50 carbon atoms such as butyl stearate and montan wax and fatty acid ester-based lubricants, or composite lubricants in which these are combined.
Among these, fatty acid amide-based lubricants are preferred.
The anti-blocking agent is not particularly limited, and examples thereof include silica, calcium carbonate, titania, mica, talc, and acrylic resins such as polymethyl methacrylate (PMMA).
Among these, silica and PMMA are preferred.
Lubricants and antiblocking agents may be used alone or in combination of two or more.

The content of the lubricant in the laminate layer 4 is not particularly limited, and is appropriately adjusted according to the type of lubricant and the like. The lubricant content is preferably 200 ppm (by mass) or more and less than 6000 ppm, more preferably 200 to 5000 ppm, even more preferably 500 to 5000 ppm, and particularly preferably 1000 to 5000 ppm, relative to the total mass of the laminate layer 4. When the content of the lubricant is at least the above lower limit, the blocking resistance of the sealant material is likely to be further enhanced. When the content of the lubricant is less than the above upper limit or equal to or less than the above upper limit, the effects of the inclusion of the lubricant are saturated, and the deterioration of the sealing performance and impact resistance of the film 1 can be easily suppressed.

The content of the antiblocking agent in the laminate layer 4 is not particularly limited, and is appropriately adjusted depending on the type of antiblocking agent. The content of the antiblocking agent is preferably 200 ppm (by mass) or more and less than 10000 ppm, more preferably 200 to 5000 ppm, still more preferably 500 to 5000 ppm, and particularly preferably 1000 to 5000 ppm, relative to the total weight of the laminate layer. When the content of the antiblocking agent is at least the above lower limit, the blocking resistance of the sealant material 7 is more likely to be enhanced. If the content of the antiblocking agent is less than the above upper limit value or equal to or less than the above upper limit value, the effect of incorporating the antiblocking agent is saturated, and deterioration of the sealing property and impact resistance of the film 1 is likely to be suppressed.

The thickness _T4 of the laminate layer 4 is preferably 10-50 μm, more preferably 15-35 μm. When the thickness _T4 is at least the above lower limit, the sealability and impact resistance are likely to be improved. When the thickness _T4 is equal to or less than the above upper limit, the film 1 is more easily split.
The thickness _T4 is preferably larger than the thickness _T5 of the oxygen absorbing layer, which will be described later, from the viewpoint of further increasing the impact resistance. Preferably, the difference between the thickness _T4 and the thickness _T5 is 5 μm or more. On the other hand, the difference between the thickness _T4 and the thickness _T5 is preferably 20 μm or less from the viewpoint of enhancing the flexibility of the film 1 and making it easier to handle.

The sealing layer 6 is similar to the laminate layer 4 . That is, the seal layer 6 preferably contains an acid-modified polyolefin and a polyolefin similarly to the laminate layer 4, and may contain 20 to 70% by mass of the acid-modified polyolefin with respect to the total mass of the seal layer 6. preferable. As the acid-modified polyolefin and polyolefin in the sealing layer 6, the same ones as those in the laminate layer 4 are used.
The seal layer 6 and laminate layer 4 may be the same or different.

The thickness T ₆ of the sealing layer 6 is similar to the thickness T ₄ of the laminate layer 4 .
The thickness T6 of the sealing layer ₆ and the thickness _T4 of the laminate layer 4 may be the same or different. When the thickness _T6 of the seal layer 6 and the thickness _T4 of the laminate layer 4 are the same, the sealant material 7 can be easily prevented from being distorted or warped. Therefore, the thickness _T6 of the seal layer 6 and the thickness _T4 of the laminate layer 4 are preferably the same. The thickness T ₆ and the thickness T ₄ being the same means that the thickness difference (T ₆ −T ₄ ) is within ±5% of the thickness T ₄ .

The oxygen absorbing layer 5 is located between the laminate layer 4 and the sealing layer 6 .
The oxygen absorbing layer 5 is a layer containing at least one polymer (G) selected from ethylene-vinyl alcohol polymer (EVOH), polyvinyl alcohol (PVOH) and xylylenediamine-based polyamide resin.
The sealant material 7 has an oxygen absorbing ability by being provided with the oxygen absorbing layer 5 .

As EVOH, those having an ethylene copolymerization ratio of 10 to 50 mol % are preferable.
As PVOH, those having an average degree of polymerization of 1,200 to 1,800 are preferred.
A xylylenediamine-based polyamide resin is a polycondensate of xylylenediamine and a linear aliphatic dicarboxylic acid. Examples of xylylenediamine include meta-xylylenediamine, a mixture of meta-xylylenediamine and para-xylylenediamine, and the like. Examples of straight-chain aliphatic dicarboxylic acids include straight-chain aliphatic dicarboxylic acids having 6 to 12 carbon atoms, such as adipic acid, sebacic acid, suberic acid, dodecanedioic acid, and mixtures thereof. A polycondensate of meta-xylylenediamine and adipic acid is preferable as the xylylenediamine-based polyamide resin.
A synthetic product or a commercially available product may be used as the xylylenediamine-based polyamide resin. Commercially available products include, for example, the “MX nylon” series (trade name) manufactured by Mitsubishi Gas Chemical Company, Inc.
Any one of these polymers (G) may be used alone, or two or more thereof may be used in combination.

The thickness _T5 of the oxygen absorbing layer 5 is appropriately adjusted in consideration of the material of the oxygen absorbing layer 5 and the like. The thickness _T5 is, for example, preferably 1 to 50 μm, more preferably 2 to 30 μm, even more preferably 5 to 15 μm. When the thickness _T5 is equal to or greater than the above lower limit, the oxygen barrier property tends to be enhanced. When the thickness _T5 is equal to or less than the above upper limit value, the flexibility of the film 1 is enhanced and handling is facilitated.

The content of the polymer (G) in the oxygen absorbing layer 5 is preferably 85 to 99.99% by mass, more preferably 90 to 99.9% by mass, more preferably 92 to 99.9% by mass, relative to the total mass of the oxygen absorbing layer 5. 99% by mass is more preferred. When the content of the polymer (G) is at least the above lower limit, the oxygen-absorbing layer 5 having a sufficient thickness _T5 can be easily obtained, and the oxygen-barrier properties can be easily improved. When the content of the polymer (G) is equal to or less than the above upper limit, a sufficient amount of the oxygen absorbing material (H), which will be described later, can be contained, and the oxygen absorbing capacity of the oxygen absorbing layer 5 tends to increase.

The oxygen absorbing layer 5 contains at least one oxygen absorbing material (H) selected from transition metal salts and compounds having a carbon-carbon double bond. When the film 1 is provided with the oxygen absorbing layer 5 containing the oxygen absorbing material (H), when the film 1 is made into a packaging bag, oxygen entering from the outside to the inside of the packaging bag is reduced. Since it can be captured by the absorption layer 5, the oxygen barrier property is further enhanced. Furthermore, the oxygen absorption layer 5 can absorb oxygen entering the headspace of the packaging bag when the contents are contained in the packaging bag. Therefore, the amount of oxygen in the packaging bag can be further reduced, deterioration of the content can be further suppressed, and the shelf life of the content can be further extended.

Examples of the oxygen absorbent (H) include transition metal salts and compounds having a carbon-carbon double bond. Transition metal salts also function as oxygen absorption catalysts.
Examples of transition metal salts include iron salts, nickel salts, copper salts, manganese salts, cobalt salts, rhodium salts, titanium salts, chromium salts, vanadium salts and ruthenium salts. Among these, iron salts, nickel salts, copper salts, manganese salts and cobalt salts are preferred, manganese salts and cobalt salts are more preferred, and cobalt salts are even more preferred.
The anion constituting the transition metal salt is preferably an organic acid such as acetic acid, stearic acid, dimethyldithiocarbamic acid, palmitic acid, 2-ethylhexanoic acid, neodecanoic acid, linoleic acid, toric acid, oleic acid, resin acid. , capric acid and naphthenic acid.
As the transition metal salt, cobalt neodecanoate and cobalt oleate are preferred.

The compound having a carbon-carbon double bond is not particularly limited, but examples thereof include conjugated diene polymers and cyclized conjugated diene polymers obtained by cyclizing them. Examples of the conjugated diene polymer and the cyclized conjugated diene polymer obtained by cyclizing the same include polyterpenes such as poly(α-pinene), poly(β-pinene) and poly(dipentene).

Conjugated diene polymers include homopolymers or copolymers of conjugated diene monomers, and copolymers of conjugated diene monomers and other monomers. Other monomers include monomers copolymerizable with the conjugated diene monomer.
Conjugated diene monomers include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 2-phenyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1, 3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,3-octadiene, 3-butyl-1,3-octadiene and the like. Any one of these monomers may be used alone, or two or more thereof may be used in combination. Among these, 1,3-butadiene and isoprene are preferred, and isoprene is more preferred.
The monomer copolymerizable with the conjugated diene monomer is not particularly limited, and examples thereof include aromatic vinyl monomers such as styrene, methylstyrene, dimethylstyrene, ethylstyrene, butylstyrene, chlorostyrene, and bromostyrene. Chain olefin monomers such as ethylene, propylene and 1-butene; Cyclic olefin monomers such as cyclopentene and 2-norbornene; 1,5-hexadiene, 1,6-heptadiene, 1,7-octadiene, dicyclo Non-conjugated diene monomers such as pentadiene and 5-ethylidene-2-norbornene; (meth)acrylic acid esters such as methyl (meth)acrylate and ethyl (meth)acrylate; (meth)acrylonitrile, (meth)acrylamide and the like is mentioned. Any one of these monomers may be used alone, or two or more thereof may be used in combination.
The term "(meth)acryl" used herein means either or both of "methacryl" and "acryl".
Conjugated diene polymers include natural rubber (NR), styrene-butadiene rubber (SBR), polyisoprene rubber (IR), polybutadiene rubber (BR), isoprene-isobutylene copolymer rubber (IIR), ethylene-propylene-diene system Copolymer rubber, butadiene-isoprene copolymer rubber (BIR) and the like can be mentioned. Among them, polyisoprene rubber and polybutadiene rubber are preferred, and polyisoprene rubber is more preferred.

A conjugated diene polymer cyclized product is obtained by subjecting a conjugated diene polymer to a cyclization reaction in the presence of an acid catalyst.
Acid catalysts used in the cyclization reaction include, for example, sulfuric acid; Organic sulfonic acid compounds such as anhydrides or alkyl esters; boron trifluoride, boron trichloride, tin tetrachloride, titanium tetrachloride, aluminum chloride, diethylaluminum monochloride, ethylammonium dichloride, aluminum bromide, antimony pentachloride, metal halides such as tungsten chloride and iron chloride; Any one of these acid catalysts may be used alone, or two or more thereof may be used in combination.
The glass transition temperature (Tg) of the conjugated diene polymer cyclized product is not particularly limited, but is preferably 0 to 100°C, more preferably 30 to 70°C.
Any one of these oxygen absorbents (H) may be used alone, or two or more thereof may be used in combination.

The content of the oxygen absorbing material (H) in the oxygen absorbing layer 5 is preferably 0.01 to 15% by mass, more preferably 0.1 to 10% by mass, based on the total mass of the oxygen absorbing layer 5. ~8% by mass is more preferred. When the content of the oxygen absorbing material (H) is at least the above lower limit, when the film 1 is made into a packaging bag, the oxygen present in the packaging bag such as the head space is sufficiently absorbed. This makes it easier to extend the shelf life of the contents. In addition, the oxygen barrier property of the packaging bag is enhanced. When the content of the oxygen absorbing material (H) is equal to or less than the above upper limit, the flexibility of the oxygen absorbing layer 5 is less likely to be impaired, making handling easier.

An adhesive layer (not shown) may be formed between the oxygen absorbing layer 5 and the laminate layer 4 . By forming the adhesive layer, the integrity between the oxygen absorbing layer 5 and the laminate layer 4 is further enhanced, and the impact resistance is likely to be enhanced.
As the material constituting the adhesive layer, conventionally known materials can be used, for example, polyurethane, polyester, epoxy, polyvinyl acetate, acid-modified polyolefin adhesives, titanate adhesives, polyurethane adhesives, Anchor coat agents such as polyethyleneimine-based and polybutadiene-based agents are included. Any one of these materials may be used alone, or two or more thereof may be used in combination.
When the adhesive layer is formed, its thickness is not particularly limited, and is preferably 0.01 to 4 μm, for example.

The film 1 is manufactured according to a conventionally known manufacturing method.
The manufacturing method of the film 1 includes a substrate forming step of forming the substrate 3 , a sealant material forming step of forming the sealant material 7 , and a lamination step of laminating the substrate 3 and the sealant material 7 .

As a method for producing the film 1, there is a method (Method i) in which a substrate forming step, a sealant forming step, and a lamination step are performed independently, and a substrate forming step, a sealant forming step, and a laminating step. is carried out in one step (method ii).

Method i is a method in which the base material forming step, the sealant material forming step, and the lamination step are performed independently.
The substrate forming step in method i is the step of obtaining the substrate 3 . A process for obtaining the base material 3 is selected from conventionally known methods according to the material and configuration of the base material 3 .
A method for obtaining the substrate 3 is selected from conventionally known methods such as an inflation method, a T-die method, a co-extrusion method, etc., depending on the material, structure, etc. of the substrate 3 .
In the base material forming step, after forming the base material 3, the base material 3 is provided with a first cut band 10, a second cut band 20, an induction cut band 30, a first relief cut band 40, and a second relief cut. A step of forming the band 50 (hereinafter also referred to as a cutting step) is included.

In the cutting step, there is a method of applying cutting using a metal blade. Examples of metal blades include push blades and rotary blades.
The shape of the blade may be linear or arcuate. From the viewpoint of easily obtaining a smoother cleavage line, the shape of the blade is preferably linear. In addition, when the shape of the blade is arc-shaped, the cut lines formed by the cutting process are arc-shaped. In the case of arc-shaped cut lines, the extension direction is the direction in which a straight line connecting the midpoints of each cut line extends. When the arc-shaped cut lines are inclined with respect to the extending direction, the inclination angle is the minor angle formed by a straight line connecting both ends of the arc-shaped cut lines and a straight line connecting the midpoints of the respective cut lines.

The step of forming the sealant material in method i is a step of obtaining the sealant material 7 . The process of obtaining the sealant material 7 is selected from conventionally known methods according to the material and structure of the sealant material 7 .
A method for obtaining the sealant material 7 is selected from conventionally known methods such as a coextrusion method using a T-die coextruder, an inflation coextruder, or the like.
The lamination step in method i is a step of laminating the cut base material 3 and the sealant material 7 to form the bag film 1 .
As a method of laminating the base material 3 and the sealant material 7 subjected to cut processing, for example, after applying an adhesive to one surface of the base material 3, the base material 3 subjected to cut processing and the sealant material 7 are laminated. and the like.

Method ii is a method in which the substrate formation step, the sealant formation step, and the lamination step are performed in one step.
Method ii includes, for example, a method of integrally molding the base material 3 subjected to cut processing and the sealant material 7 by inflation molding using a circular die.
Molding conditions in inflation molding are appropriately determined in consideration of the material of the substrate 3 and the like. For example, blow-up ratio: 1.2 to 2.5, take-up speed: 5 to 50 m/min, temperature of resin constituting sealant material 7: 160 to 210° C., temperature of resin constituting base material 3: 200 to Co-extrude at 250°C.

The film 1 having the cleavage portion B formed on the surface of the base material 3 can be obtained by cutting into an arbitrary size through the method i or the method ii.

[Packaging bag]
The packaging bag of the present invention uses the bag film of the present invention. FIG. 3 shows one embodiment of the packaging bag of the present invention.
The packaging bag 100 has a first surface portion 100α and a second surface portion 100β. The first surface portion 100α is formed of the film 1. As shown in FIG. The second surface portion 100β is formed of the film 1. As shown in FIG.
The cleaved portion _Bα of the first surface portion 100α and the cleaved portion _Bβ of the second surface portion 100β overlap. The guide cut line 32a of the first surface portion 100α and the guide cut line 32a of the second surface portion 100β are inclined in opposite directions.

The packaging bag body 100 is a three-sided seal bag having a folded edge C formed by folding the film 1 along a folding line orthogonal to one side A so that the split portion B overlaps.
The cleft portion _Bα of the first surface portion 100α is formed inside the seal portion S1 that seals the one side A of the film 1 . The seal portion S2 is formed on the side facing the bent edge C. As shown in FIG. The seal portion S3 is formed on the side facing the side A of the film 1 . The height (length in the Y direction) _H100 of the packaging bag 100 is the same as _H1 . The width (length in the X direction) L ₁₀₀ of the packaging bag 100 is not particularly limited, and is preferably 60 to 400 mm, more preferably 80 to 250 mm. When the width _L100 is equal to or greater than the above lower limit value, it is easy to sufficiently secure an accommodation space for the packaging bag body 100 . When the width L ₁₀₀ is equal to or less than the above upper limit, it is easy to make the packaging bag 100 suitable for the size of the object to be accommodated in the packaging bag 100 .

The width H _S1 of the seal portion S1 is not particularly limited, and is preferably 2 to 20 mm, more preferably 5 to 15 mm. When the width H _S1 is equal to or greater than the above lower limit, the sealing performance and impact resistance of the packaging bag 100 are likely to be enhanced. When the width _HS1 is equal to or less than the above upper limit, it is easy to sufficiently secure the accommodation space for the packaging bag 100 . Width H _S1 can be measured in the same manner as width W _12a .
The width H _S2 of the seal portion S2 is the same as the width H _S1 . The width H _S2 may be the same as or different from the width H _S1 .
The width H _S3 of the seal portion S3 is the same as the width H _S1 . The width H _S3 may be the same as or different from the width H _S1 .

FIG. 4 is an enlarged developed view of the packaging bag 100. As shown in FIG. The +X side of the bent edge C in FIG. 4 forms the first surface portion 100α. The second surface portion 100β is formed on the −X side of the bent edge C in FIG. A notch N is formed on the folded edge C of the packaging bag 100 . The notch N is the opening starting point at the time of opening. Therefore, the notch N is positioned so that effective opening is possible, that is, the guiding cut row 30b of the first surface portion 100α formed corresponding to the desired opening direction, and the guiding cut row 30b of the second surface portion 100β. are preferably formed at positions where they function effectively. The shape of the notch N is not particularly limited, and may be, for example, a so-called I notch or V notch.

An opening line E formed when the packaging bag 100 is opened from the notch N is formed on the first surface portion 100α of the packaging bag 100 . An opening line F formed when the packaging bag 100 is opened from the notch N is formed on the second surface portion 100β of the packaging bag 100 . The arrow in the figure represents the opening direction of the packaging bag 100 .
The opening line E starts at notch N, meets one of the guiding cut lines 32b, diverges in the -Y direction, then moves in the unpacking direction (+X direction) to one of the second relaxation cut lines 52. collide. The opening line E is diverted further in the -Y direction by a second relief score line 52 and meets one of the second score lines 22a while heading in the opening direction. Thereafter, the unsealing line E advances in the unsealing direction along the second cut line 20a and reaches one side of the packaging bag body 100 on the sealing portion S2 side.
On the other hand, the unsealing line F starts from the notch N, hits one of the guiding cut lines 32b, deviates in the +Y direction, and then hits one of the guiding cut lines 32a while heading in the unsealing direction (-X direction). The opening line F is diverted further in the +Y direction by the guiding score line 32a and meets one of the first relief score lines 42 while heading in the opening direction. The opening line F is diverted further in the +Y direction by the first relief score line 42 and meets one of the first score lines 12a while heading in the opening direction. After that, the unsealing line F advances in the unsealing direction along the first cut row 10a and reaches one side of the packaging bag body 100 on the sealing portion S2 side.

The unsealing line E is deflected in the -Y direction by encountering one of the guiding score lines 32b slanted at the slant angle D _32b . The opening line E then diverges further in the -Y direction by encountering one of the second relief score lines 52 with an inclination angle D ₅₂ less than the inclination angle D _32b . As described above, the packaging bag 100 has two types of cut lines with different inclination angles, so that the opening line E can be cut more smoothly and the opening end face can be made clean.
The unsealing line F is deflected in the +Y direction by hitting one of the guiding score lines 32b slanted at the slant angle D _32b . The opening line F then deviates further in the +Y direction by encountering one of the guiding score lines 32a which is inclined at an inclination angle D _32a . Subsequently, the opening line F deviates further in the +Y direction by encountering one of the first relief score lines 42 with an inclination angle D ₄₂ less than the inclination angle D _32a . In this way, the packaging bag 100 has two types of cut lines with different inclination angles, so that the opening line F can be cut more smoothly, and the opening end face can be clean.

In the packaging bag 100, two opening lines E and F are formed, so that the opening end of the packaging bag 100 is displaced in the Y direction in the drawing, and the opening of the packaging bag 100 is difficult to pinch with fingers. The opening can be easily opened using the grip portion.

The first score strip 10 has a first score row 10a and a first score row 10b. The first cut row 10b is a cut row for reliably guiding the opening line F in the opening direction when the opening line F does not advance along the first cut row 10a and deviates in the +Y direction. is. As a result, it is possible to prevent the packaging bag 100 from being unsealed by deviating in the +Y direction before the unsealing line F reaches one side in the unsealing direction, thereby preventing the opening from becoming insufficiently large. For this reason, the first slit band 10 of the packaging bag 100 preferably has two or more first slit rows.
The second score band 20 has a second score line 20a and a second score line 20b. The second cut row 20b is a cut for reliably guiding the opening line E in the opening direction when the opening line E does not proceed along the second cut row 20a and deviates in the -Y direction. column. As a result, it is possible to prevent the packaging bag 100 from being unsealed by deviating in the -Y direction before the unsealing line E reaches one side in the unsealing direction, thereby preventing the opening from becoming insufficiently large. For this reason, the second slit band 20 of the packaging bag 100 preferably has two or more second slit rows.

The packaging bag 100 is obtained by stacking two sheets of the film 1 and heat-sealing them. When two sheets of film 1 are laminated and heat-sealed, as shown in FIG. The conditions for heat sealing are not particularly limited, and for example, when forming the sealed portion S1, the conditions are as follows. The temperature for heat sealing is preferably 120 to 240°C, more preferably 160 to 200°C. When the temperature for heat sealing is equal to or higher than the above lower limit, the film 1 can be sufficiently sealed. Degradation of the film 1 can be easily suppressed when the temperature for heat sealing is equal to or lower than the above upper limit.
The pressure for heat sealing is preferably 2.0 to 5.0 kg/cm ² , more preferably 2.5 to 4.5 kg/cm ² . When the pressure for heat sealing is equal to or higher than the above lower limit, the film 1 can be sufficiently sealed. Deterioration of the film 1 can be easily suppressed when the pressure for heat sealing is equal to or less than the above upper limit.
The heat sealing time is preferably 0.5 to 5.0 seconds, more preferably 1.0 to 3.0 seconds. When the heat-sealing time is equal to or longer than the above lower limit, the film 1 can be sufficiently sealed. When the heat-sealing time is equal to or less than the above upper limit, the productivity of the film 1 can be easily improved.
The seal portion S2 is formed under the same conditions as the seal portion S1.
The seal portion S3 is formed under the same conditions as the seal portion S1.

The tearing portion _Bα of the first surface portion 100α of the packaging bag 100 includes first cut lines 12a, 12b, first relief cut lines 42, guide cut lines 32a, 32b, second cut lines 22a, 22b are formed.
The tearing portion _Bβ of the second surface portion 100β of the packaging bag 100 includes first cut lines 12a, 12b, first relief cut lines 42, guide cut lines 32a, 32b, second cut lines 22a, 22b are formed.
Since these cut lines are formed only in the base material 3, the accommodation space inside the packaging bag 100 is kept airtight. In addition, since the packaging bag 100 has the oxygen-absorbing layer 5 , the oxygen-absorbing layer 5 can trap oxygen entering from the outside. Therefore, the oxygen barrier property is further enhanced. Furthermore, the oxygen absorption layer 5 can absorb oxygen entering the headspace of the packaging bag 100 when the contents are contained in the packaging bag 100 . Therefore, the amount of oxygen in the packaging bag body 100 can be further reduced, deterioration of the content can be further suppressed, and the shelf life of the content can be further extended.
Each cut line formed in the split portion _Bα may be formed in the sealant material 7 as long as the packaging bag 100 can maintain its sealing performance. The cut lines formed in the cleaved portion _Bβ are the same as the cut lines formed in the cleaved portion _Bα .

By stacking two films 1 and heat-sealing them, a packaging bag 100 having a first surface portion 100α and a second surface portion 100β is obtained. By stacking two films 1 and heat-sealing them, a sealed portion S1 is formed along one side A, a sealed portion S2 is formed on the side opposite to the folded edge C, and a sealed portion S3 is formed on the side opposite to the side A. is obtained.

The packaging bag 100 is formed by forming the film 1 into a bag. As the packaging bag body 100, for example, a bag made by heat-sealing the seal layers 6 of the film 1 can be used. Examples of the form of the packaging bag 100 include a folded bag, a three-side sealed bag, a four-sided sealed bag, a gusset bag, and a stand bag.

As described above, the packaging bag 100 is easier to open because the base material 3 is cut. In addition, the film 1 of the packaging bag 100 has two types of cut lines with different inclination angles, so that the cut edges of the opening lines can be made smoother and the opening end face can be made clearer. That is, in the packaging bag 100, the minor angle formed by the extending direction of the first relief cut line and the first relief cut line is less than the minor angle formed by the extending direction of the guide cut line and the guide cut line. is small, the opening line is guided to the first cut strip or the second cut strip while changing its direction of travel. In addition, in the packaging bag body 100, the minor angle formed by the extending direction of the second relief cut line and the second relief cut line is the inferior angle formed by the extending direction of the guide cut line and the guide cut line. , the tear line is guided to the first score strip or the second score strip while changing its direction of travel. As a result, the packaging bag 100 can be reliably torn through the first slit or the second slit, can be opened more easily, and the open end face can be cleaned. In addition, the packaging bag 100 has excellent oxygen barrier properties, sealing properties, and impact resistance, and can reduce oxygen in the packaging bag 100 . Therefore, the packaging bag 100 is suitable as a package for foods, medicines, and the like. In particular, since the oxygen-absorbing layer contains the oxygen-absorbing material (H), the oxygen barrier property of the packaging bag 100 is further enhanced, and the packaging bag 100 can absorb oxygen present in the packaging bag 100, It is possible to further suppress the content from being degraded by oxygen. As a result, the shelf life of the contents can be further extended. The packaging bag 100 is particularly suitable as a package for foodstuffs, medicines, and the like, which are easily degraded by oxygen.
In addition, conventionally, in order to make a package that requires multiple functions such as oxygen barrier property, sealing property, impact resistance, easy opening property, etc., layers having each of the above functions are laminated to form a multilayer structure of, for example, 5 or more layers. I needed it. In the present embodiment, the sealant material 7 is made up of the film 1, so that the above functions can be covered by a single layer of the sealant material 7. FIG. Therefore, when manufacturing the packaging bag body 100, large-scale manufacturing equipment is not required, and the productivity and economy are excellent. In addition, according to the packaging bag 100, for example, it is possible to omit a process such as nitrogen replacement that is performed when storing contents that are easily degraded by oxygen in the bag, which is excellent in productivity and economic efficiency.

As shown in FIG. 6, the packaging bag 200 has a first surface portion 200α and a second surface portion 200β. The first surface portion 200α has two cleavage portions _B1α and _B2α . The two cleavage portions _B1α and _B2α are formed on two adjacent sides. Cleavage B _1α has a first cut strip 10, a second cut strip 20, a guide cut strip 30, a first relief cut strip 40, and a second relief cut strip 50, similar to cleavage B described above. , and the description thereof will be omitted. Cleavage B _2α is similar to cleavage B _1α .
The second surface portion 200β has two cleavage portions _B1β and _B2β . The two cleavage portions _B1β and _B2β are formed on two adjacent sides. Cleavage B _1β has a first cut strip 10, a second cut strip 20, a lead cut strip 30, a first relief cut strip 40, and a second relief cut strip 50, similar to cleavage B described above. , and the description thereof will be omitted. Cleavage _B2β is similar to cleavage _B1β .

The cleaved portion _B1α of the first surface portion 200α and the cleaved portion _B1β of the second surface portion 200β overlap, and the guide cut line of the cleaved portion _B1α and the guide cut line of the cleaved portion _B1β are mutually sloping in the opposite direction.
The cleavage portion _B2α of the first surface portion 200α and the cleavage portion _B2β of the second surface portion 200β overlap, and the guiding cut line of the cleavage portion _B2α and the guiding cut line of the cleavage portion _B2β are mutually sloping in the opposite direction.

The packaging bag 200 is a four-sided seal bag whose four sides are sealed with seal portions S4, S5, S6, and S7. A cleaved portion _B1α is formed on the −Y side of the seal portion S4. A cleaved portion _B1β is formed on the −Y side of the seal portion S4. A cleaved portion _B2α is formed on the −X side of the seal portion S7. A cleaved portion _B2β is formed on the −X side of the seal portion S7. The seal portions S4, S5, S6 and S7 are formed in the same manner as the seal portion S1.

According to the packaging bag 200 of the present embodiment, since the two openings are formed, the packaging bag 200 can be opened from two positions. Therefore, two openings can be formed, and the contents contained in the packaging bag 200 can be taken out more easily. Therefore, it is preferable that the packaging bag has two tear portions formed on two adjacent sides.

[Other embodiments]
The packaging bag of the present invention is not limited to the above-described embodiments.
In the packaging bag 100, the guiding slit band 30 has two or more guiding slit rows 30a and 30b. However, the number of guiding cut lines may be one.
In the packaging bag body 100, there are two types of relief cut bands, the first relief cut band ₄₀ and the second relief cut band ₅₀ . , and a fourth relief discontinuity strip. However, in the packaging bag 100, from the viewpoint of shortening the length _HB of the splitting portion B, it is preferable to use two types of relief slit bands.
In the packaging bag body 100, the inclination angle _D12a of the first cut line 12a is 0°. The tilt angle _D12a is not limited to this, and may be -5 to 5 degrees. However, from the viewpoint of matching the unsealing line with the unsealing direction, the inclination angle D _12a is preferably 0°.
In the packaging bag body 100, the inclination angle _D22a of the second cut line 22a is 0°. The tilt angle D _22a is not limited to this, and may be -5 to 5 degrees. However, from the viewpoint of matching the unsealing line with the unsealing direction, the inclination angle D _22a is preferably 0°.
In the packaging bag body 100, a notch N serving as an opening starting point is formed, but the notch N may not be formed.
In the packaging bag 100, the split portion B is formed parallel to the side A, but the entire split portion may be inclined at an arbitrary angle with respect to the side.
In the packaging bag body 200, two tearing portions B are formed, but the number of tearing portions B may be three or four.

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the following examples.
The materials used in this example are as follows.

[Materials used]
≪Base material≫
· Biaxially stretched PET: thickness 12 µm, Lumirror (trade name), manufactured by Toray Advanced Film Co., Ltd.

≪Sealant material≫
<Laminate layer, sealing layer>
- Acid-modified PE: maleic anhydride-modified polyethylene (acid-modified polyethylene 50% by mass), Modic (trade name), manufactured by Mitsubishi Chemical Corporation.
• PE: polyethylene.
(Lubricant)
• Erucic acid amide.
(anti-blocking agent)
- Silica ( _SiO2 ).

<Oxygen absorption layer>
(Polymer (G))
EVOH: ethylene content 32 mol%, EVAL (trade name), manufactured by Kuraray Co., Ltd.
(Oxygen absorber (H))
- Oxygen absorber: conjugated diene polymer cyclized product.

[Examples 1 to 5, Comparative Examples 1 to 4]
A base material (biaxially stretched PET) cut with a blade having an inclination angle shown in Table 1 and a sealant material containing an oxygen absorbing layer are laminated to form Examples 1 to 5 and Comparative Examples 1 to 4. A bag film was produced accordingly. One cleaved portion was provided. The width of the cleaved portion was 10 mm. The laminate layer was a 20 μm thick layer containing 50% by mass of acid-modified polyethylene. The oxygen absorbing layer was a 10 μm thick layer of the polymer (G) containing the oxygen absorbing material (H). The sealing layer was a 20 μm thick layer containing 50% by mass of acid-modified polyethylene and containing a lubricant and an antiblocking agent.
The sealing layer of the resulting bag film was heat-sealed (sealing temperature: 180°C, sealing time: 1 second, sealing pressure: 3.5 kg/cm ² , sealing width: 10 mm) to form a three-sided seal of 130 mm × 170 mm. A bag (flat bag) was produced. The obtained flat bags were opened by hand, the smoothness of the open end face was visually confirmed, and the number of flat bags in which the opening line deviated from the tearing portion was counted. Ten flat bags of each example were opened and evaluated based on the following evaluation criteria.
≪Evaluation Criteria≫
<Smoothness of opening end surface>
A: The number of flat bags in which burrs were observed on the opening end face was 0 (“0/10”).
○: The number of flat bags in which burrs were observed on the opening end face was 2 or less (“2/10” or less).
x: The number of flat bags in which burrs were observed on the opening end face was 3 or more (“3/10” or more).
<Ease of opening>
⊚: The number of flat bags in which the opening line deviated from the split portion was 0 (“0/10”).
◯: The number of flat bags whose opening line deviated from the split portion was 2 or less (“2/10” or less).
x: The number of flat bags in which the opening line deviated from the tearing portion was 3 or more (“3/10” or more).

≪Comprehensive evaluation≫
When both the smoothness of the opening end face and the easiness of opening were evaluated as "⊚", the overall evaluation was "⊚".
In the evaluation of the smoothness of the opening end face and the ease of opening, the overall evaluation was given as "Good" when there was no "X".
In the evaluation of the smoothness of the opening end surface and the easiness of opening, one or more "x" was given as a comprehensive evaluation of "x". Table 1 shows the results.

As shown in Table 1, it was confirmed that the flat bags (packaging bags) of Examples 1 to 5 to which the present invention was applied were excellent in the smoothness of the opening end face and the ease of opening.
On the other hand, the packaging bags of Comparative Examples 1 to 4, in which the inclination angle of the guiding score line and the inclination angles of the first relief score line and the second relief score line are equal, have smooth opening end faces or easy opening. The evaluation was "×".
From the above results, it was confirmed that by applying the present invention, the packaging bag can be opened more easily and the opening end face of the packaging bag can be cleaned.

1 Bag film 3 Base material 4 Laminate layer 5 Oxygen absorbing layer 6 Sealing layer 7 Sealant material 10 First cut strips 10a, 10b First cut rows 12a, 12b First cut line 20 Second cut strip 20a , 20b Second row of cuts 22a, 22b Second cut line 30 Leading cut strips 30a, 30b Leading cut rows 32a, 32b Leading cut line 40 First relaxation cut strip 40a First relaxation cut row 42 First relaxation Cut line 50 Second relaxation cut band 50a Second relaxation cut line 52 Second relaxation cut line 100, 200 Packaging bag body 100α, 200α First surface 100β, 200β Second surface A Side B, B _α , B _β , B _1α , B _1β , B _2α , B _2β Cleavage C Folded edges E, F Tear lines S1 to S7 Seals

Claims (7)

It is rectangular in plan view and has a cleaved portion extending along the arbitrary side at a position spaced apart from the arbitrary side by a predetermined distance,
The split portion comprises a first cut band consisting of one or more first cut rows extending along the arbitrary side;
a second scored strip spaced apart from the first scored band and comprising one or more second scored rows extending along the first scored band;
a guide cut band located between the first cut band and the second cut band and comprising one or more rows of guide cuts extending along the first cut band;
a first relief score band located between the first score score and the guiding score score and consisting of one or more first rows of relief scores extending along the first score score;
a second relief score band positioned between the second score band and the guiding score band and consisting of one or more rows of second relief score lines extending along the second score band;
The first cut line is formed of one or more first cut lines extending in the extending direction of the first cut line,
The second cut line is formed of one or more second cut lines extending in the extending direction of the second cut line,
The guiding cut row is formed by two or more guiding cut lines that are inclined at an arbitrary angle with respect to the extending direction of the guiding cut row and extend linearly ,
The first relaxation cut row is formed of two or more first relaxation cut lines that are inclined in the same direction as the guide cut line and extend linearly ,
The second relaxation cut line is formed of two or more second relaxation cut lines that are inclined in the same direction as the guide cut line and extend linearly ,
The minor angle formed by the extending direction of the first relaxation cut line and the first relaxation cut line is smaller than the minor angle formed by the extending direction of the guide cut line and the guide cut line,
The bag body, wherein the minor angle formed by the extending direction of the second relaxation cut line and the second relaxation cut line is smaller than the minor angle formed by the extending direction of the guide cut line and the guide cut line. Film for. 2. The bag film according to claim 1, wherein said first cut band has two or more said first cut rows. 3. The bag film according to claim 1, wherein said second slit band has two or more said second slit rows. The magnitude of the minor angle formed by the extending direction of the first relaxation cut row and the first relaxation cut line, and the extension direction of the second relaxation cut row and the second relaxation break line 4. The bag film according to any one of claims 1 to 3, wherein the minor angles are equal to each other. Having a first surface portion and a second surface portion facing the first surface portion,
The first surface portion is formed of the bag film according to any one of claims 1 to 4,
The second surface portion is formed of the bag film according to any one of claims 1 to 4,
The cleaved portion of the first surface portion and the cleaved portion of the second surface portion overlap,
A packaging bag, wherein the guiding score line of the second surface portion is inclined in a direction opposite to the guiding score line of the first surface portion. 6. The packaging bag according to claim 5, which is a three-sided seal bag having a folded edge perpendicular to the extending direction of said first line of cuts on said first surface portion. 7. The packaging bag according to claim 5 or 6, having two split portions, said two split portions being formed along two adjacent sides.

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