Bag with an easy-opening line formed

Abstract

To provide a bag in which a large opening can be formed. [Solution] The bag is made of a packaging material including a first base layer and a sealant layer, has a front surface and a back surface, and is used to contain contents. The bag extends in the short direction and has first and second ends that face each other in the long direction, third and fourth ends that extend from the first end to the second end along the long direction and face each other in the short direction, a first end seal portion and a second end seal portion that extend along the first and second ends, respectively, and join the inner surfaces of the packaging material, an unsealed portion located between the first and second end seal portions and where the inner surfaces of the packaging material are not joined, and an easy-open line that includes a non-through hole formed on the outer surface of the packaging material in the unsealed portion. The easy-open line is configured to cross the front surface in the short direction and reach the back surface.

Description

Technical Field

[0001] The present invention relates to a bag in which an easy-open line that does not penetrate the packaging material is formed.

Background Art

[0002] As a bag for containing contents, a film-like packaging material containing a plastic material such as PET or nylon is used. Such a bag is configured by, for example, heat-sealing the inner surfaces of the packaging material to form a seal portion as described in Patent Document 1.

[0003] When pouring out the contents from a bag made of a packaging material, the user breaks a part of the bag to form an opening. In order to facilitate the breaking of the bag, an easy-open line such as a half-cut line is usually formed in a part of the packaging material constituting the bag. For example, in Patent Document 1, it is proposed to provide an easy-open line that does not penetrate the packaging material in a portion of the packaging material that overlaps the contents. When taking out the contents from this type of bag, the user applies force to the easy-open line of the bag by bending or pressing the bag, and thereby breaks the bag along the easy-open line. In this type of bag, the user can break a part of the bag with a smaller force and take out the contents from the bag compared to a type of bag that the user tears.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the bag described in Patent Document 1, the easy-open line is formed only on the surface side of the bag. In this case, since the breaking of the bag also occurs only on the surface side, it may not be possible to form a large opening.

[0006] The object of the present invention is to provide a bag that can effectively solve such problems.

Means for Solving the Problems

[0007] The present invention is a bag formed of a packaging material including a first base material layer and a sealant layer, having a front surface and a back surface, and containing contents, a first end portion and a second end portion that extend in the short side direction and face each other in the long side direction, a third end portion and a fourth end portion that extend from the first end portion to the second end portion along the long side direction and face each other in the short side direction, a first end portion seal portion and a second end portion seal portion that respectively extend along the first end portion and the second end portion and join the inner surfaces of the packaging material together, a non-seal portion that is located between the first end portion seal portion and the second end portion seal portion and in which the inner surfaces of the packaging material are not joined, and an easy-open line including a non-through hole formed on the outer surface side of the packaging material in the non-seal portion. The easy-open line is configured to cross the front surface in the short side direction and reach the back surface side, the easy-open line is located at the central portion of the non-seal portion in the long side direction, the central portion is in the range of 0.1×L1 or less from the center of the non-seal portion in the long side direction to the first end portion side and the second end portion side, where L1 is the dimension of the non-seal portion in the long side direction, and it is a bag.

[0008] In the bag according to the present invention, the non-seal portion may be located adjacent to either the first end portion seal portion or the second end portion seal portion and may include a portion where the inner surfaces of the packaging material are in contact.

[0009] In the bag according to the present invention, the ratio of the dimension of the non-seal portion in the short side direction to the dimension of the non-seal portion in the long side direction may be 0.20 or more and 0.50 or less.

[0010] In the bag according to the present invention, the easy-open line may include a center line that is at least located on the surface and extends along the short side direction, and a restraining line that is located on the back side and extends in a direction different from the direction in which the center line extends.

[0011] The present invention is a bag formed of a packaging material including a first base material layer and a sealant layer, having a front surface and a back surface, and containing contents, a first end portion and a second end portion that extend in the short side direction and face each other in the long side direction, a third end portion and a fourth end portion that extend from the first end portion to the second end portion along the long side direction and face each other in the short side direction, a first end portion seal portion and a second end portion seal portion that extend along the first end portion and the second end portion, respectively, and join the inner surfaces of the packaging materials together, a non-seal portion that is located between the first end portion seal portion and the second end portion seal portion and in which the inner surfaces of the packaging materials are not joined, including a non-through hole formed on the outer surface side of the packaging material in the non-seal portion, and an easy-open line that at least partially extends in the short side direction, the non-seal portion is located adjacent to either the first end portion seal portion or the second end portion seal portion and includes a portion where the inner surfaces of the packaging materials are in contact with each other, the ratio of the dimension of the non-seal portion in the short side direction to the dimension of the non-seal portion in the long side direction is 0.20 or more and 0.50 or less, the easy-open line is located at the center of the non-seal portion in the long side direction, the center portion is within a range of 0.1×L1 or less from the center of the non-seal portion in the long side direction to the first end portion side and the second end portion side, where L1 is the dimension of the non-seal portion in the long side direction, and it is a bag.

[0012] In the bag according to the present invention, when the packaging material includes an adhesive layer, with the portion of the bag located on the second end side of the tear-open line fixed, when the portion of the bag 1 cm away from the tear-open line toward the first end side is pressed from the front side to the back side, the bending strength, which is the force required to bend the bag, is preferably 25 N or more.

[0013] In the bag according to the present invention, when the packaging material does not include an adhesive layer, with the portion of the bag located on the second end side of the tear-open line fixed, when the portion of the bag 1 cm away from the tear-open line toward the first end side is pressed from the front side to the back side, the bending strength, which is the force required to bend the bag, is preferably 15 N or more.

[0014] The bag according to the present invention may further include a clasp portion in which the packaging material is overlapped along the longitudinal direction from the first end to the second end on the back side.

[0015] In the bag according to the present invention, the contents may include a plurality of granular bodies.

[0016] In the bag according to the present invention, the dimension of the non-sealed portion in the longitudinal direction may be 40 mm or more and 200 mm or less.

[0017] In the bag according to the present invention, the tear-open line may extend along the short side direction and include a portion having a wave shape.

Advantages of the Invention

[0018] According to the present invention, a large opening can be formed in the bag. Therefore, the ease of taking out the contents can be improved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12A

Figure 12B

Figure 13

Figure 14

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to Figs. 1 to 8. In the drawings attached to this specification, for the convenience of illustration and easier understanding, the scale, the aspect ratio of the vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the actual objects.

[0021] In addition, with regard to terms used in this specification that specify shapes, geometric conditions, and their degrees, such as terms like "parallel", "orthogonal", "identical", etc., and values of lengths and angles, etc., they shall be interpreted to include ranges to the extent that similar functions can be expected without being restricted by strict meanings.

[0022] Bag FIG. 1 is a plan view showing a bag 10 containing contents 19. Further, FIG. 2 is a cross-sectional view of the bag 10 in FIG. 1 as viewed from the II-II direction. The bag 10 is formed by partially joining the inner surfaces of a film-like packaging material 30. The bag 10 includes a front surface 11 and a back surface 12 constituted by the packaging material 30. As shown in FIG. 2, both the front surface 11 and the back surface 12 are constituted by folding back a single piece of packaging material 30. Although not shown, the number of sheets of the packaging material 30 constituting the bag 10 is not limited to one, and the bag 10 may be constituted by a plurality of sheets of the packaging material 30.

[0023] The bag 10 is provided with an easy-open line 20 provided on the front surface 11 and the back surface 12. In the bag 10 according to the present embodiment, a usage method is assumed in which the bag 10 is broken along the easy-open line 20 to form an opening in the bag 10, and the contents 19 are taken out to the outside through this opening.

[0024] As long as it can be taken out from the bag 10 broken along the easy-open line 20, the contents accommodated in the bag 10 are not particularly limited. For example, examples of the contents filled in the bag 10 include fluids having fluidity, such as liquids like rice vinegar, dressings, and liquid detergents, viscous substances like mayonnaise, ketchup, shampoos, and rinses, powdery substances like powdered seasonings, and granular substances like rice.

[0025] The configuration of the bag 10 will be described below. As shown in FIG. 1, the bag 10 includes a first end portion 13, a second end portion 14, a third end portion 15, and a fourth end portion 16. The first end portion 13 and the second end portion 14 face each other in the longitudinal direction D1 of the bag 10. Further, the third end portion 15 and the fourth end portion 16 face each other in the short-side direction D2 of the bag 10. The third end portion 15 and the fourth end portion 16 extend from the first end portion 13 to the second end portion 14 along the longitudinal direction D1.

[0026] The longitudinal direction D1 is the conveyance direction of the packaging material 30 when the bag 10 is formed from the film-like packaging material 30, and is so-called MD (Machine Direction). In the example shown in FIG. 1, the short-side direction D2 in which the first end portion 13 and the second end portion 14 extend and the longitudinal direction D1 in which the third end portion 15 and the fourth end portion 16 extend are orthogonal to each other, and thus the bag 10 has a rectangular outer shape. Although not shown, the first end portion 13 and the second end portion 14 may extend in a direction inclined with respect to the longitudinal direction D1.

[0027] As shown in FIGS. 1 and 2, the bag 10 extends along the longitudinal direction D1 from the first end portion 13 to the second end portion 14 and includes a gusset portion 17 where the packaging material 30 is overlapped. In this way, the bag 10 is a so-called pillow bag. The gusset portion 17 is located on the back surface 12 side. In other words, in the present embodiment, the surface on which the gusset portion 17 is located is referred to as the back surface 12.

[0028] (Sealing portion) The bag 10 includes a seal portion that joins the inner surfaces of the film-like packaging material 30. The seal portion includes a first end seal portion 131 extending along the first end, a second end seal portion 141 extending along the second end 14, and a gusset seal portion 171 located at the gusset portion 17. Note that as long as the inner surfaces of the packaging material 30 can be joined to seal the bag 10, the method for forming the seal portion is not particularly limited. For example, a part of the packaging material 30 may be melted by heating or the like, and the inner surfaces of the packaging material 30 may be welded to form the seal portion. Alternatively, the seal portion may be formed by adhering the inner surfaces of the packaging material 30 using an adhesive or the like.

[0029] As shown in FIG. 1, the gusset seal portion 171 extends in the longitudinal direction D1 from the first end seal portion 131 to the second end seal portion 141. As shown in FIG. 2, the gusset seal portion 171 may extend to the tip portion 172 of the gusset portion 17 in the short direction D2, or alternatively, although not shown, the gusset seal portion 171 may not extend to the tip portion 172. Further, the gusset seal portion 171 may extend to the base portion 173 of the gusset portion 17 in the short direction D2, or alternatively, although not shown, the gusset seal portion 171 may not extend to the base portion 173.

[0030] (Non-seal portion) Further, the bag 10 includes a non-seal portion 18 where the inner surfaces of the packaging material 30 are not joined. FIG. 3 is a cross-sectional view of the bag 10 in FIG. 1 as viewed from the III-III direction. As shown in FIG. 3, the non-seal portion 18 includes a portion where the content 19 exists between the inner surface of the packaging material 30 constituting the front surface 11 and the inner surface of the packaging material 30 constituting the back surface 12 (hereinafter also referred to as the first non-seal portion 181). In the first non-seal portion 181, as shown in FIG. 3, both the inner surface of the packaging material 30 constituting the front surface 11 and the inner surface of the packaging material 30 constituting the back surface 12 may be in contact with the content 19.

[0031] Further, the non-sealing portion 18 may include a portion where the inner surface of the packaging material 30 constituting the front surface 11 and the inner surface of the packaging material 30 constituting the back surface 12 are in contact (hereinafter also referred to as the second non-sealing portion 182). In the example shown in FIG. 3, the non-sealing portion 18 includes the second non-sealing portion 182 adjacent to the first end sealing portion 131 and the second non-sealing portion 182 adjacent to the second end sealing portion 141. Although not shown, the non-sealing portion 18 may include only the second non-sealing portion 182 adjacent to either one of the first end sealing portion 131 or the second end sealing portion 141.

[0032] The first non-sealing portion 181 and the second non-sealing portion 182 are formed by putting the contents 19 into the bag 10 in a state where a part thereof is open, then discharging the air inside the bag 10 to the outside, and then forming a sealing portion along the opening to seal the bag 10. The portion where the inner surface of the packaging material 30 is in contact with the contents 19 becomes the first non-sealing portion 181, and the portion where the inner surfaces of the packaging material 30 are in contact with each other becomes the second non-sealing portion 182.

[0033] Next, the advantages of discharging the air inside the bag 10 to the outside, that is, degassing, will be described. Here, as shown in FIG. 4, the case where the content 19 includes a plurality of granular bodies 191 will be described. In this case, by performing degassing inside the bag 10, as shown in FIG. 4, the plurality of granular bodies 191 can be brought into contact with each other. Further, the inner surface 301 of the packaging material 30 constituting the front surface 11 and the inner surface 301 of the packaging material 30 constituting the back surface 12 can be brought into contact with the plurality of granular bodies 191. Thereby, the ratio of the space in the interior of the bag 10 where the granular bodies 191 do not exist can be lowered, and the fluidity of each granular body 191 can be reduced. For example, when the bag 10 is repeatedly shaken in the longitudinal direction D1 while being held by hand, the contact state of each granular body 191 can be maintained. As a result, a predetermined rigidity can be imparted to the entire content 19. For example, when the first end portion 13 side of the bag 10 is gripped and the bag 10 is lifted so that the front surface 11 and the back surface 12 are parallel in the horizontal direction, the content 19 will not bend. Further, when a force is applied to the bag 10, it is possible to suppress the content 19 and the bag 10 from bending before the tear-open line 20 breaks. Therefore, as will be described later, it becomes easier to apply a force to the bag 10 that bends the bag 10 in the longitudinal direction D1 and generates tension in the packaging material 30 of the front surface 11. For this reason, based on the tension applied to the packaging material 30 of the front surface 11, the bag 10 can be broken along the tear-open line 20.

[0034] The size and weight of the granular bodies 191 are preferably within a range that can impart a predetermined rigidity to the entire content 19 in a state where the inside of the bag 10 is degassed. For example, the average particle size of the granular bodies 191 is preferably 0.05 mm or more and 10 mm or less, and more preferably 0.5 mm or more and 5 mm or less. Alternatively, the average volume of each granular body 191 is preferably 0.05 mm 3 or more and 20 mm 3 or less, and more preferably 1 mm 3 or more and 10 mm 3 or less.

[0035] In FIG. 1, reference numeral L1 represents the dimension of the non-sealed portion 18 in the longitudinal direction D1, and reference numeral L2 represents the dimension of the non-sealed portion 18 in the short transverse direction D2. The dimension L1 is, for example, 40 mm or more and 200 mm or less, and more preferably 50 mm or more and 150 mm or less. Thereby, it becomes possible for the user to open the bag 10 while holding it with one hand. Further, the dimension L2 is, for example, 15 mm or more and 70 mm or less, and may be 20 mm or more and 50 mm or less.

[0036] The ratio of the dimension L2 to the dimension L1 is, for example, 0.10 or more, may be 0.20 or more, and may be 0.30 or more. Further, the ratio of the dimension L2 to the dimension L1, that is, L2 / L1, is, for example, 0.70 or less, may be 0.60 or less, and may be 0.50 or less.

[0037] Some specific examples of the dimension L1, the dimension L2, and L2 / L1 are as follows. ·L1 = 200 mm, L2 = 100 mm, L2 / L1 = 0.50 ·L1 = 180 mm, L2 = 40 mm, L2 / L1 = 0.22 ·L1 = 130 mm, L2 = 30 mm, L2 / L1 = 0.23 ·L1 = 100 mm, L2 = 20 mm, L2 / L1 = 0.20 ·L1 = 80 mm, L2 = 25 mm, L2 / L1 = 0.31 ·L1 = 60 mm, L2 = 30 mm, L2 / L1 = 0.50

[0038] When the bag 10 is sealed in a state where the inside of the bag 10 is degassed, the air pressure inside the bag 10 is lower than the atmospheric pressure. Therefore, when a part of the bag 10 is broken to communicate the inside of the bag 10 with the outside, air flows into the inside of the bag 10, and the bag 10 swells at least partially. Accordingly, whether or not the inside of the bag 10 is degassed can be determined based on whether or not the bag 10 swells at least partially after a part of the bag 10 is broken.

[0039] (Easy-open seal line) Next, the easy-opening line 20 will be described. The easy-opening line 20 is a linear portion of the packaging material 30 located at the non-sealed portion 18 and is configured to be easily broken.

[0040] The easy-opening line 20 at least includes a center line 21. The center line 21 is a portion of the easy-opening line 20 that extends so as to intersect the center line C of the bag 10 on the surface 11 side when looking at the bag 10 along the normal direction of the surface 11. The center line C is a straight line connecting the midpoint of the first end portion 13 and the midpoint of the second end portion 14. In the example shown in FIG. 1, the base portion 173 of the clasp portion 17 coincides with the center line C.

[0041] The easy-opening line 20 is preferably located at the central portion of the non-sealed portion 18 in the longitudinal direction D1. The central portion is, for example, a range within 0.1×L1 from the center of the non-sealed portion 18 in the longitudinal direction D1 toward the first end portion 13 side and the second end portion 14 side.

[0042] In the present embodiment, as shown in FIGS. 1 and 2, the center line 21 crosses the surface 11 in the short-side direction D2 and reaches the back surface 12 side. For example, the center line 21 extends linearly from the surface 11 side through the third end portion 15 to the back surface 12 side and terminates at one end 211. Also, the center line 21 extends linearly from the surface 11 side through the fourth end portion 16 to the back surface 12 side and terminates at the other end 212.

[0043] In the example shown in FIG. 2, one end 211 and the other end 212 of the center line 21 face each other in the short-side direction D2 so as to sandwich the base portion 173 of the clasp portion 17. The distance S1 between one end 211 and the other end 212 in the short-side direction D2 is, for example, 2 mm or more and 10 mm or less.

[0044] The distance S1 may be defined with respect to the entire circumference of the bag 10 in a cross-sectional view along the short-side direction D2 shown in FIG. 2. The ratio of the distance S1 to the entire circumference of the bag 10 is preferably 20% or less, more preferably 10% or less. In other words, the ratio of the length of the easy-open line 20 to the entire circumference of the bag 10 is preferably 80% or more, more preferably 90% or more. Note that the entire circumference of the bag 10 includes the lengths of the surface 11, the back surface 12, the third end portion 15, and the fourth end portion 16 of the packaging material 30, but does not include the length of the folded portion 17.

[0045] Next, the structure of the easy-open line 20 formed in the packaging material 30 will be described with reference to FIG. 5 together with the layer configuration of the packaging material 30. FIG. 5 is a cross-sectional view of the bag 10 of FIG. 1 as viewed from the V-V direction.

[0046] First, the layer configuration of the packaging material 30 will be described. The packaging material 30 includes at least a base material layer 31 and a sealant layer 32. In the example shown in FIG. 5, the base material layer 31 constitutes the outer surface 302 of the packaging material 30, and the sealant layer 32 constitutes the inner surface 301 of the packaging material 30. Further, the packaging material 30 may further include an adhesive layer such as an adhesive layer 33 that adheres the base material layer 31 and the sealant layer 32. The adhesive layer is a layer formed of an adhesive described later. The thickness of the packaging material 30 is, for example, 50 μm or more, more preferably 55 μm or more. Also, the thickness of the packaging material 30 is, for example, 150 μm or less, more preferably 100 μm or less, and still more preferably 80 μm or less.

[0047] As materials for constituting the base material layer 31, for example, stretched plastic films such as polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyamides such as nylon (Ny), and polyolefins such as high-density polyethylene (HDPE) and polypropylene (PP) can be used. The stretched plastic film may be stretched in two axes in the longitudinal direction D1 and the short-side direction D2. As the base material layer 31, a biaxially stretched plastic film that is easily torn in the short-side direction D2 may be used. Examples of such films include "Trefan YT42", which is a biaxially stretched polypropylene film manufactured by Toray Industries, Inc., and "Embret PC", which is a biaxially stretched polyethylene terephthalate film manufactured by Unitika Ltd. The packaging material 30 may include a plurality of base material layers 31. The thickness of the base material layer 31 is, for example, 4 μm or more and 30 μm or less.

[0048] As materials for constituting the sealant layer 32, for example, ethylene-methacrylic acid copolymer (EMMA), polyethylene such as low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), and polypropylene (PP) can be used. The sealant layer 32 is preferably not stretched. The thickness of the sealant layer 32 may be, for example, 60 μm or less, 50 μm or less, or 30 μm or less. Also, the thickness of the sealant layer 32 is, for example, 13 μm or more. The sealant layer 32 may be composed of a single layer or a plurality of layers.

[0049] Although not shown in the drawings, the packaging material 30 may further include a printing layer including a printed display for indicating product information or imparting aesthetic sense to the bag 10. The printing layer is provided, for example, on the inner surface side of the base material layer 31. Examples of the printed display include characters, numbers, symbols, figures, patterns, and the like.

[0050] Also, although not shown in the drawings, the packaging material 30 may further include a functional layer. The functional layer is located, for example, between the base material layer 31 and the sealant layer 32.

[0051] As the functional layer, an appropriate one can be selected according to the required performance such as water vapor and other gas barrier properties, light shielding properties, and various mechanical strengths. For example, when the functional layer is a gas barrier layer, the functional layer may be a metal foil such as aluminum foil. Further, the functional layer may be a vapor deposition layer or a resin layer provided on the base material layer 31 or the sealant layer 32. The vapor deposition layer contains, for example, a substance having gas barrier properties such as an inorganic substance such as aluminum, an inorganic oxide such as aluminum oxide or silicon oxide. The thickness of the vapor deposition layer is, for example, 5 nm or more and 200 nm or less, preferably 50 nm or more and 100 nm or less. The resin layer contains, for example, a resin material having gas barrier properties such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), and aromatic polyamide such as nylon MXD6. By providing such a functional layer having gas barrier properties, it is possible to suppress oxygen and water vapor from entering the inside of the bag 10.

[0052] Next, the structure of the easy-open line 20 will be described. As shown in FIG. 5, the easy-open line 20 includes a non-through hole 201 formed in the outer surface 302 of the packaging material 30. In the example shown in FIG. 5, the non-through hole 201 is configured to penetrate the base material layer 31 and reach the adhesive layer 33. Although not shown, the non-through hole 201 may be configured not to penetrate the base material layer 31.

[0053] The width S2 and depth S3 of the non-through hole 201 of the easy-open line 20 are set so that the easy-open line 20 breaks when a user applies an appropriate force to the bag 10. For example, the width of the non-through hole 201 of the easy-open line 20 is 80 μm or more and 1 mm or less. Further, the depth S3 of the non-through hole 201 is, for example, 12 μm or more and 40 μm or less. Such a non-through hole 201 can be formed, for example, by irradiating the packaging material 30 with laser light from the outer surface 302 side to process the packaging material 30.

[0054] When a force is applied to the bag 10, the ease of breakage of the tear-open line 20 depends on the structure, thickness, etc. of the portion of the packaging material 30 where the non-through hole 201 is not formed (hereinafter also referred to as the remaining portion). The remaining portion includes at least the sealant layer 32. Depending on the method of forming the non-through hole 201 and the layer structure of the packaging material 30, the remaining portion further includes an adhesive layer, an anchor coat layer, an adhesive resin layer, a uniaxially stretched film, and a functional layer. The structure of the remaining portion is set so that the remaining portion breaks appropriately within the range of the force assumed to be applied to the tear-open line 20. When the packaging material includes an adhesive layer, the bending strength of the bag 10 tends to increase, and when the packaging material does not include an adhesive layer, the bending strength of the bag 10 tends to decrease. The bending strength of the bag 10 will be described later. The thickness of the remaining portion is set so that the remaining portion breaks appropriately within the range of the force assumed to be applied to the tear-open line 20. The thickness of the remaining portion is, for example, 80 μm or less, may be 60 μm or less, or may be 50 μm or less.

[0055] (Adhesive layer) The adhesive layer is used when bonding one layer to another using the dry lamination method. As the adhesive constituting the adhesive layer, one-component or two-component curable or non-curable vinyl-based, (meth)acrylic-based, polyamide-based, polyester-based, polyether-based, polyurethane-based, epoxy-based, rubber-based, polyvinyl acetate-based adhesives, polyacrylate-based adhesives composed of homopolymers such as ethyl, butyl, 2-ethylhexyl esters of acrylic acid or copolymers thereof with methyl methacrylate, acrylonitrile, styrene, etc., cyanoacrylate-based adhesives, ethylene copolymer-based adhesives composed of copolymers of ethylene with monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc., cellulose-based adhesives, polyester-based adhesives, polyamide-based adhesives, polyimide-based adhesives, amino resin-based adhesives composed of urea resin or melamine resin, etc., phenol resin-based adhesives, epoxy-based adhesives, polyurethane-based adhesives, reactive (meth)acrylic acid-based adhesives, inorganic adhesives composed of chloroprene rubber, nitrile rubber, styrene-butadiene rubber, etc., silicone-based adhesives, inorganic adhesives composed of alkali metal silicate, low melting point glass, etc., and other adhesives can be used. More preferably, for example, polyurethane-based resins that are cured products of polyfunctional isocyanates such as aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, or aliphatic polyisocyanates such as hexamethylene diisocyanate, xylylene diisocyanate, etc., and polyether-based polyols, polyester-based polyols, polyacrylate polyols, and other hydroxyl group-containing compounds, are the main components. According to these, a thin film rich in flexibility and bendability can be formed, its tensile elongation can be improved, it acts as a film having flexibility, bendability, etc., and the processability such as lamination processing and printing processing can be improved. The above adhesive can be applied using, for example, the direct gravure roll coating method, the gravure roll coating method, the kiss coating method, the reverse roll coating method, the fountain method, the transfer roll coating method, or other coating methods, and the solvent can be dried to form an adhesive layer. The coating amount of the adhesive is preferably 1.5 g / m 2 or more and 10 g / m 2 or less (in the dry state), more preferably 3 g / m 2 or more and 5 g / m 2 or less (in the dry state). The thickness of the adhesive layer in the dry state is 1.5 μm or more and 10 μm or less, preferably 3 μm or more and 5 μm or less.

[0056] (Anchor coat layer) When laminating an adhesive resin layer using the melt extrusion method or the melt extrusion lamination method, it is preferable to previously apply an anchor coat agent to the layer on which the adhesive resin layer is to be laminated to form an anchor coat layer. Examples of the anchor coat agent constituting the anchor coat layer include organic titanium-based anchor coat agents such as alkyl titanate, isocyanate-based anchor coat agents, polyethyleneimine-based anchor coat agents, polybutadiene-based anchor coat agents, isocyanate-based (urethane-based), polyethyleneimine-based, and other anchor coating agents. More preferably, for example, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and polymethylene polyphenylene polyisocyanate, or aliphatic polyisocyanates such as hexamethylene diisocyanate and xylylene diisocyanate, and other polyfunctional isocyanates, and a polyurethane-based resin that is a cured product of a polyether-based polyol, a polyester-based polyol, a polyacrylate polyol, or other hydroxyl group-containing compounds as the main component can be preferably used. The adhesion between the layers constituting the packaging material can be improved. The above anchor coating agent can be applied using, for example, a roll coating method, a gravure coating method, a knife coating method, a dip coating method, a spray coating method, or other coating methods, and by drying the solvent, an anchor coating layer can be formed. The coating amount of the anchor coating agent is preferably 0.1 g / m 2 or more and 0.5 g / m 2 or less (in a dry state). The thickness of the anchor coating layer in a dry state is 0.5 μm or less, preferably 0.1 μm or less.

[0057] (Adhesive resin layer) In the present invention, as the adhesive resin layer, a resin layer made of a thermoplastic resin is used. Specifically, as the material of the adhesive resin layer, polyethylene (PE) such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, and copolymers of ethylene and α-olefins polymerized using a metallocene catalyst, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-maleic acid copolymer, ionomer, resins obtained by graft polymerization or copolymerization of unsaturated carboxylic acids, unsaturated carboxylic acids, unsaturated carboxylic acid anhydrides, and ester monomers to polyolefin resins, resins obtained by graft-modifying maleic anhydride to polyolefin resins, etc. can be used. These materials can be used alone or in combination of two or more. In the present invention, the thickness of the adhesive resin layer is preferably 5 μm or more and 30 μm or less, more preferably 10 μm or more and 120 μm or less. Also, the adhesive resin layer can be not only a single layer but also a multilayer of two or more layers. In that case, the thickness of each layer can be set appropriately according to the physical properties required for the packaging material (such as heat adhesiveness and the firmness of the film).

[0058] (Uniaxially stretched film) In the present invention, the uniaxially stretched film refers to a film stretched only in the short-side direction D2. Examples of such films include "KARARIYAN Y", a high-density polyethylene film manufactured by Denka Company Limited.

[0059] Examples of the layer structure of the packaging material 30 are as follows. First example: Substrate layer / Printing layer / Adhesive layer / Sealing layer Second example: Substrate layer / Printing layer / Adhesive layer / Metal vapor deposition layer / Sealing layer Third example: Substrate layer / Printing layer / Adhesive layer / Uniaxially stretched film / Adhesive layer / Sealing layer Fourth example: Substrate layer / Printing layer / Anchor coat layer / Adhesive resin layer / Uniaxially stretched film / Anchor coat layer / Sealing layer Fifth example: Substrate layer / Printing layer / Anchor coat layer / Adhesive resin layer / Metal foil / Anchor coat layer / Adhesive resin layer / Sealing layer Sixth example: Substrate layer / Printing layer / Anchor coat layer / Adhesive resin layer / Sealing layer

[0060] Specific examples of the above first to sixth examples are as follows. First example: PET(12) / Printing layer(1) / Adhesive layer(3) / PE(50) Second example: PP(25) / Printing layer(1) / Adhesive layer(3) / Aluminum vapor deposition layer(0.05) / PP(30) Third example: Ny(15) / Printing layer(1) / Adhesive layer(3) / Uniaxially stretched HDPE(18) / Adhesive layer(3) / PE(40) Fourth example: PET(12) / Printing layer(1) / Anchor coat layer(0.1) / PE(15) / Uniaxially stretched HDPE(18) / Anchor coat layer(0.1) / PE(30) Fifth example: PET(12) / Printing layer(1) / Anchor coat layer(0.1) / PE(13) / Aluminum foil(6) / Anchor coat layer(0.1) / PE(13) / PE(30) Sixth example: Ny(15) / Printing layer(1) / Anchor coat layer(0.1) / PE(13) / PE(30) In Examples 1 to 6, the plastic films constituting the base material layer are all biaxially stretched plastic films, and the sealant layers are all unstretched. Also, the numerical values in parentheses represent the thickness of each layer. The unit of thickness is μm.

[0061] In the packaging material 30, the non-through hole 201 is formed so as to penetrate at least the base material layer 31, and is not formed from the outermost adhesive resin layer or the uniaxially stretched film to the sealant layer 32.

[0062] In the packaging material 30 of the first example, the non-through hole 201 may be formed in "PET(12) / printing layer(1)", and "adhesive(3) / PE(50)" may be the remaining part, or the non-through hole 201 may be formed in "PET(12) / printing layer(1) / adhesive layer(3)", and "PE(50)" may be the remaining part. In the former case, the thickness of the part of the packaging material 30 where the non-through hole 201 is formed is 13 μm, and the thickness of the remaining part is 53 μm. In the latter case, the thickness of the part of the packaging material 30 where the non-through hole 201 is formed is greater than 13 μm and less than or equal to 16 μm, and the thickness of the remaining part is greater than or equal to 50 μm and less than 53 μm. Also, the total thickness of the packaging material 30 is 66 μm.

[0063] In the packaging material 30 of the second example, the non-through hole 201 may be formed in "PP(25) / printing layer(1)", and "adhesive layer(3) / aluminum vapor deposition layer(0.05) / PP(30)" may be the remaining part, or the non-through hole 201 may be formed in "PP(25) / printing layer(1) / adhesive layer(3)", and "aluminum vapor deposition layer(0.05) / PP(30)" may be the remaining part. In the former case, the thickness of the part of the packaging material 30 where the non-through hole 201 is formed is 26 μm, and the thickness of the remaining part is 33.05 μm. In the latter case, the thickness of the part of the packaging material 30 where the non-through hole 201 is formed is greater than 26 μm and less than or equal to 29 μm, and the thickness of the remaining part is greater than or equal to 30.05 μm and less than 33.05 μm. Also, the total thickness of the packaging material 30 is 59.05 μm.

[0064] In the packaging material 30 of the third example, a non-through hole 201 is formed in the "Ny(15) / printing layer(1)", and there are cases where "adhesive layer(3) / uniaxially stretched HDPE(18) / adhesive layer(3) / PE(40)" becomes the remaining part, and cases where a non-through hole 201 is formed in the "Ny(15) / printing layer(1) / adhesive layer(3)", and "uniaxially stretched HDPE(18) / adhesive layer(3) / PE(40)" becomes the remaining part. In the former case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is 16 μm, and the thickness of the remaining part is 64 μm. In the latter case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is greater than 16 μm and less than or equal to 19 μm, and the thickness of the remaining part is greater than or equal to 61 μm and less than 64 μm. Also, the thickness of the entire packaging material 30 is 80 μm.

[0065] In the packaging material 30 of the fourth example, a non-through hole 201 is formed in the "PET(12) / printing layer(1)", and there are cases where "anchor coat layer(0.1) / PE(15) / uniaxially stretched HDPE(18) / anchor coat layer(0.1) / PE(30)" becomes the remaining part, and cases where a non-through hole 201 is formed in the "PET(12) / printing layer(1) / anchor coat layer(0.1)", and "PE(15) / uniaxially stretched HDPE(18) / anchor coat layer(0.1) / PE(30)" becomes the remaining part. In the former case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is 13 μm, and the thickness of the remaining part is 63.2 μm. In the latter case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is greater than 13 μm and less than or equal to 13.1 μm, and the thickness of the remaining part is greater than or equal to 63.1 μm and less than 63.2 μm. Also, the thickness of the entire packaging material 30 is 75.2 μm.

[0066] In the packaging material 30 of the fifth example, a non-through hole 201 is formed in "PET(12) / printing layer(1)", and there are cases where "anchor coat layer(0.1) / PE(13) / aluminum foil(6) / anchor coat layer(0.1) / PE(13) / PE(30)" becomes the remaining part, and cases where a non-through hole 201 is formed in "PET(12) / printing layer(1) / anchor coat layer(0.1)", and "PE(13) / aluminum foil(6) / anchor coat layer(0.1) / PE(13) / PE(30)" becomes the remaining part. In the former case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is 13 μm, and the thickness of the remaining part is 62.2 μm. In the latter case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is greater than 13 μm and 13.1 μm or less, and the thickness of the remaining part is 62.1 μm or more and less than 62.2 μm. Also, the total thickness of the packaging material 30 is 75.2 μm.

[0067] In the packaging material 30 of the sixth example, a non-through hole 201 is formed in "Ny(15) / printing layer(1)", and there are cases where "anchor coat layer(0.1) / PE(13) / PE(30)" becomes the remaining part, and cases where a non-through hole 201 is formed in "Ny(15) / printing layer(1) / anchor coat layer(0.1)", and "PE(13) / PE(30)" becomes the remaining part. In the former case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is 16 μm, and the thickness of the remaining part is 43.1 μm. In the latter case, the thickness of the part where the non-through hole 201 is formed in the packaging material 30 is greater than 16 μm and less than 16.1 μm, and the thickness of the remaining part is 43.μm or more and less than 43.1 μm. Also, the total thickness of the packaging material 30 is 59.1 μm.

[0068] Method for manufacturing a bag Next, an example of a method for manufacturing the above-described bag 10 will be described.

[0069] First, a long packaging material 30 is prepared. Next, while conveying the packaging material 30 along the MD of the packaging material 30, a non-through hole 201 of the easy-open line 20 is formed on the outer surface 302 of the packaging material 30. Subsequently, the packaging material 30 is folded into a cylindrical body. Then, the second end seal portion 141 is formed by sandwiching and pressing the facing inner surfaces 301 in the cylindrical body while heating them.

[0070] Subsequently, the content 19 is put into the cylindrical body. Also, the overlapping portions of the packaging material 30 constituting the cylindrical body along the conveyance direction are sandwiched and pressed while heating to form the clasp seal portion 171.

[0071] Subsequently, the inside of the cylindrical body is degassed. For example, degassing is performed using a nozzle-type vacuum packaging machine or a chamber-type vacuum packaging machine. Then, the first end seal portion 131 is formed by sandwiching and pressing the portion of the packaging material 30 constituting the cylindrical body that faces the second end seal portion 141 with the content 19 inside while heating.

[0072] Next, at the positions of the first end seal portion 131 and the second end seal portion 141, the packaging material 30 constituting the cylindrical body is cut in a direction perpendicular to the conveyance direction. In this way, the bag 10 with the inside degassed can be obtained.

[0073] Bag opening method Next, a method for opening the above-mentioned bag 10 will be described with reference to FIGS. 6 and 7.

[0074] First, as shown in FIG. 6, the user holds the bag 10 by, for example, attaching the index finger 41 of one hand to the first end 13 and the thumb 42 of one hand to the second end 14. Subsequently, a force is applied to the bag 10 to fold it toward the back surface 12 side in the longitudinal direction D1. For example, as shown in FIG. 6, a force F1 toward the back surface 12 side and the second end 14 side is applied to the bag 10 from the first end 13 side. Also, a force F2 toward the back surface 12 side and the first end 13 side is applied to the bag 10 from the second end 14 side.

[0075] Here, in the present embodiment, as described above, the content 19 accommodated inside the bag 10 includes a plurality of granular bodies 191, and the inside of the bag 10 is degassed. Therefore, the entire content 19 has a predetermined rigidity. Accordingly, the forces F1 and F2 shown in FIG. 6 each function as a force to bend the entire content 19 having rigidity toward the back surface 12 side.

[0076] When the forces F1 and F2 exceed the rigidity of the entire content 19, the entire content 19 bends toward the back surface 12 side. At this time, a tension is applied to the packaging material 30 constituting the front surface 11. Here, in the present embodiment, the center line 21 of the easy-open line 20 is formed in the packaging material 30 constituting the front surface 11. Therefore, the packaging material 30 constituting the front surface 11 can be broken along the center line 21 to form an opening 25 in the bag 10 as shown in FIG. 7.

[0077] Also, in the present embodiment, as described above, the center line 21 of the easy-open line 20 crosses the packaging material 30 constituting the front surface 11 and reaches the packaging material 30 constituting the back surface 12. Therefore, the breakage of the bag 10 along the center line 21 can proceed from the front surface 11 side to the back surface 12 side.

[0078] FIG. 8 is a view of the opening 25 shown in FIG. 7 as seen from the direction of arrow VIII. In the present embodiment, the center line 21 of the easy-open line 20 extends to the back surface 12 side. Therefore, compared with the case where the easy-open line 20 is formed only on the front surface 11 side, the length of the contour of the opening 25 on the first end portion 13 side and the length of the contour of the opening 25 on the second end portion 14 side can be increased respectively. Thereby, the area of the opening 25 can be increased, and the ease of taking out the content 19 can be improved.

[0079] It should be noted that various modifications can be made to each of the above-described embodiments. Hereinafter, modification examples will be described. In the following description and the drawings used in the following description, for parts that can be configured in the same manner as each of the above-described embodiments, the same reference numerals as those used for the corresponding parts in the above-described embodiments will be used, and duplicate descriptions will be omitted. Further, when it is clear that the operational effects obtained in the above-described embodiments can also be obtained in the modification examples, the description thereof may be omitted.

[0080] (First Modification Example) In the above-described present embodiment, an example in which the tear line 20 such as the center line 21 extends linearly has been shown. In this modification example, an example in which the tear line 20 such as the center line 21 includes a wavy portion will be described. FIG. 9 is a plan view showing the bag 10 according to this modification example as viewed from the surface 11 side.

[0081] In this modification example, as shown in FIG. 9, the center line 21 extending in the short side direction D2 has a wavy shape. For example, the center line 21 includes a peak portion 203 located on the first end portion 13 side and a valley portion 204 located on the second end portion 14 side. In this case, when a tension is applied to the packaging material 30 constituting the surface 11, the tension concentrates on the peak portion 203 or the valley portion 204. Therefore, breakage along the tear line 20 is likely to start.

[0082] In FIG. 9, reference numeral S4 represents the period of the wavy shape in the short side direction D2, and reference numeral S5 represents the amplitude of the wavy shape. The period S4 is, for example, 2 mm or more and 13 mm or less. Also, the amplitude S5 is, for example, 1 mm or more and 5 mm or less.

[0083] (Second Modification Example) In this modification example, an example in which the tear line 20 includes a plurality of lines will be described. FIG. 10 is a plan view showing the bag 10 according to this modification example as viewed from the surface 11 side.

[0084] In the example shown in FIG. 10, the easy-open line 20 has a center line 21 located on the surface 11 side, a first side line 22 connected to one end 211 of the center line 21, and a second side line 23 connected to the other end 212 of the center line 21.

[0085] The first side line 22 has a first end side first side line 221 located closer to the first end 13 than the center line 21, and a second end side first side line 222 located closer to the second end 14 than the first end side first side line 221 and the center line 21. Both the first end side first side line 221 and the second end side first side line 222 of the first side line 22 extend through the third end 15 to reach the back surface 12.

[0086] The second side line 23 has a first end side second side line 231 located closer to the first end 13 than the center line 21, and a second end side second side line 232 located closer to the second end 14 than the first end side second side line 231 and the center line 21. Both the first end side second side line 231 and the second end side second side line 232 of the second side line 23 extend through the fourth end 16 to reach the back surface 12.

[0087] Hereinafter, the operation of the bag 10 shown in FIG. 10 will be described. When a force is applied to the bag 10 to bend it toward the back surface 12 side in the longitudinal direction D1, as described above, a tension is applied to the packaging material 30 constituting the surface 11. Here, in the present embodiment, the first side line 22 and the second side line 23 each include a plurality of lines arranged in the longitudinal direction D1. In this case, the tension applied to the packaging material 30 from the first end 13 side is applied to the lines located on the first end 13 side, for example, the first end side first side line 221 and the first end side second side line 231. Also, the tension applied to the packaging material 30 from the second end 14 side is applied to the lines located on the second end 14 side, for example, the second end side first side line 222 and the second end side second side line 232. Thus, in the first side line 22 and the second side line 23, the tension from the first end 13 side and the tension from the second end 14 side are applied to different lines respectively.

[0088] On the other hand, in the central portion in the short-side direction D2, the tension from the first-end portion 13 side and the tension from the second-end portion 14 side are both applied to the center line 21. For this reason, since force is concentratedly applied to the center line 21 as compared with the first side line 22 and the second side line 23, it is likely to break. Therefore, in the present embodiment, breakage along the center line 21 is likely to start.

[0089] After the center line 21 breaks, in the first side line 22, breakage progresses in either the first-end-side first side line 221 or the second-end-side first side line 222 and reaches the back surface 12 side. Also, in the second side line 23, breakage progresses in either the first-end-side second side line 231 or the second-end-side second side line 232 and reaches the back surface 12 side.

[0090] In FIG. 10, reference sign S6 represents the dimension of the center line 21 in the short-side direction D2, and reference sign S7 represents the maximum interval in the longitudinal direction D1 between the first-end-side first side line 221 and the second-end-side first side line 222. The dimension S6 is set such that tension is likely to concentrate on the center line 21, and is, for example, 3 mm or more and 15 mm or less. The maximum interval S7 is, for example, 2 mm or more and 8 mm or less. The maximum interval in the longitudinal direction D1 between the first-end-side second side line 231 and the second-end-side second side line 232 is also equivalent to the maximum interval S7.

[0091] (Third Modification Example) In this modification example, an example in which the easy-open seal line 20 includes the restraining line 24 will be described. FIG. 11 is a plan view showing the bag 10 according to this modification example as viewed from the back surface 12 side.

[0092] In the example shown in FIG. 11, the easy-opening line 20 has a center line 21 extending from the front surface 11 side to the back surface 12 side, a restraining line 24 connected to one end 211 of the center line 21, and a restraining line 24 connected to the other end 212 of the center line 21. The restraining line 24 extends in a direction different from the direction in which the center line 21 extends. For example, as shown in FIG. 11, the restraining line 24 extends along the longitudinal direction D1 orthogonal to the short-side direction D2 in which the center line 21 extends. Therefore, the progress of the break can be stopped at the restraining line 24.

[0093] As shown in FIG. 11, the restraining line 24 may include a first-end-side restraining line 241 extending from one end 211 or the other end 212 of the center line 21 toward the first end portion 13 side, and a second-end-side restraining line 242 extending from one end 211 or the other end 212 of the center line 21 toward the second end portion 14 side. Alternatively, although not shown, the restraining line 24 may include only one of the first-end-side restraining line 241 and the second-end-side restraining line 242.

[0094] Although several modifications to the above-described embodiments have been described, of course, it is also possible to appropriately combine and apply a plurality of modifications.

[0095] (Other aspects) Another aspect of the present invention is a bag formed of a packaging material including a first base material layer and a sealant layer, having a front surface and a back surface, and containing contents, the bag extending in the short side direction and having a first end portion and a second end portion facing each other in the longitudinal direction, a third end portion and a fourth end portion extending from the first end portion to the second end portion along the longitudinal direction and facing each other in the short side direction, a first end seal portion and a second end seal portion respectively extending along the first end portion and the second end portion and joining the inner surfaces of the packaging material, a non-seal portion located between the first end seal portion and the second end seal portion where the inner surfaces of the packaging material are not joined, and an easy-open line including a non-through hole formed on the outer surface side of the packaging material at the non-seal portion, wherein the easy-open line is configured to cross the front surface in the short side direction and reach the back surface side.

[0096] In the bag according to another aspect of the present invention, the non-seal portion may be located adjacent to either the first end seal portion or the second end seal portion and may include a portion where the inner surfaces of the packaging material are in contact with each other.

[0097] In the bag according to another aspect of the present invention, the ratio of the dimension of the non-seal portion in the short side direction to the dimension of the non-seal portion in the longitudinal direction may be 0.20 or more and 0.50 or less.

[0098] In the bag according to another aspect of the present invention, the easy-open line may have a center line located at least on the front surface and extending along the short side direction, and a restraining line located on the back surface side and extending in a direction different from the direction in which the center line extends.

[0099] Another aspect of the present invention is a bag formed of a packaging material including a first base material layer and a sealant layer, having a front surface and a back surface, and containing contents, the bag extending in the short side direction and having a first end portion and a second end portion facing each other in the long side direction, a third end portion and a fourth end portion facing each other in the short side direction and extending from the first end portion to the second end portion along the long side direction, a first end seal portion and a second end seal portion respectively extending along the first end portion and the second end portion and joining the inner surfaces of the packaging material, a non-seal portion located between the first end seal portion and the second end seal portion where the inner surfaces of the packaging material are not joined, and an easy-open line including a non-through hole formed on the outer surface side of the packaging material at the non-seal portion and at least partially extending in the short side direction, wherein the non-seal portion is located adjacent to either the first end seal portion or the second end seal portion and includes a portion where the inner surfaces of the packaging material are in contact, and the ratio of the dimension of the non-seal portion in the short side direction to the dimension of the non-seal portion in the long side direction is 0.20 or more and 0.50 or less.

[0100] In the bag according to another aspect of the present invention, when the packaging material includes an adhesive layer, with the portion of the bag located on the second end side of the easy-open line fixed, when a portion 1 cm away from the easy-open line to the first end side of the bag is pressed from the front surface side to the back surface side, the bending strength, which is the force required to bend the bag, is preferably 25 N or more.

[0101] In the bag according to another aspect of the present invention, when the packaging material does not include an adhesive layer, with the portion of the bag located on the second end side of the easy-open line fixed, when a portion 1 cm away from the easy-open line to the first end side of the bag is pressed from the front surface side to the back surface side, the bending strength, which is the force required to bend the bag, is preferably 15 N or more.

[0102] The bag according to another aspect of the present invention may further include a clasp portion extending along the long side direction from the first end portion to the second end portion and where the packaging material is overlapped on the back surface side.

[0103] In a bag according to another aspect of the present invention, the content may include a plurality of granular bodies.

[0104] In a bag according to another aspect of the present invention, the dimension of the non-sealed portion in the longitudinal direction may be 40 mm or more and 200 mm or less.

[0105] In a bag according to another aspect of the present invention, the easy-open line may include a portion that extends along the short side direction and has a corrugated shape.

[0106] In a bag according to another aspect of the present invention, the easy-open line is located on the front surface, and includes a center line that extends along the short side direction, a first side line that is connected to one end of the center line and extends to the back surface, and a second side line that is connected to the other end of the center line and extends to the back surface. The first side line includes a first end side first side line that is located closer to the first end side than the center line and a second end side first side line that is located closer to the second end side than the center line. The second side line may include a first end side second side line that is located closer to the first end side than the center line and a second end side second side line that is located closer to the second end side than the center line.

Example

[0107] Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following description of the examples as long as the gist thereof is not exceeded.

[0108] (Example 1) The layer configuration shown in the above-mentioned third example, that is ONy(15) / Printing layer(1) / Adhesive layer(3) / Uniaxially stretched HDPE(18) / Adhesive layer(3) / PE(40) A packaging material 30 having the following layer structure was prepared. The non-through hole 201 was formed in Ny(15) / printing layer (1). Subsequently, using the packaging material 30, the bag 10 shown in FIG. 1 was produced. The dimension L1 in the longitudinal direction D1 of the unsealed portion 18 of the bag 10 was 120 mm, and the dimension L2 in the short transverse direction D2 of the unsealed portion 18 was 25 mm. The content of the bag 10 was granular instant coffee. Also, before sealing the bag 10, degassing inside the bag 10 was carried out.

[0109] Subsequently, using a tensile testing machine (Tensilon), the bending resistance of the bag 10 was measured in the compression test mode. Specifically, first, as shown in FIG. 12A, the bag 10 was placed on the support base 52 such that the back surface 12 of the portion of the bag 10 located on the second end portion 14 side from the easy-open seal line 20 contacted the support base 52. Subsequently, with the portion of the bag 10 located on the second end portion 14 side from the easy-open seal line 20 fixed to the support base 52 so as not to be displaced, as shown in FIG. 12A, the portion of the bag 10 that was separated from the easy-open seal line 20 by a distance T toward the first end portion 13 side was pressed from the surface 11 side to the back surface 12 side with a force F3 using the jig 51. As the jig 51, a metal jig provided in the tensile testing machine (Tensilon) was used. The distance T was set to 1 cm.

[0110] Until the bag 10 bent, the force F3 with which the jig 51 pressed the bag 10 was increased. As a result, when the force F3 reached 26.7 N, as shown in FIG. 12B, the easy-open seal line 20 broke and the bag 10 bent, and the jig 51 slipped to the first end portion 13 side of the bent bag 10. The force F3 when the bag 10 bent and the jig 51 slipped to the first end portion 13 side, that is, 26.7 N, was recorded as the bending resistance of the bag 10.

[0111] (Example 2) A bag 10 was produced using the packaging material 30 in the same manner as in Example 1, except that furikake was used as the content. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 reached 30.8 N, the easy-open seal line 20 broke and the bag 10 bent, and the jig 51 slipped to the first end portion 13 side.

[0112] (Example 3) The bag 10 was produced using the packaging material 30 in the same manner as in Example 2, except that the dimension L1 in the longitudinal direction D1 of the unsealed portion 18 of the bag 10 was 130 mm and the dimension L2 in the short transverse direction D2 of the unsealed portion 18 was 30 mm. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 34.0 N, the easy-open seal line 20 broke, the bag 10 bent, and the jig 51 slipped off toward the first end portion 13 side.

[0113] (Example 4) The bag 10 was produced using the packaging material 30 in the same manner as in Example 1, except that grains were used as the contents. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 26.5 N, the easy-open seal line 20 broke, the bag 10 bent, and the jig 51 slipped off toward the first end portion 13 side.

[0114] (Example 5) The bag 10 was produced using the packaging material 30 in the same manner as in Example 1, except that powdered detergent was used as the contents. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 28.6 N, the easy-open seal line 20 broke, the bag 10 bent, and the jig 51 slipped off toward the first end portion 13 side.

[0115] (Comparative Example 1) The bag 10 was produced using the packaging material 30 in the same manner as in Example 1, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10 before sealing the bag 10. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 9.8 N, the bag 10 bent without the easy-open seal line 20 breaking, and the jig 51 slipped off toward the first end portion 13 side.

[0116] (Comparative Example 2) The bag 10 was produced using the packaging material 30 in the same manner as in Example 2, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10 before sealing the bag 10. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 14.7 N, the bag 10 bent without the easy-open seal line 20 breaking, and the jig 51 slipped off toward the first end portion 13 side.

[0117] (Comparative Example 3) Before sealing the bag 10, a gas was filled into the bag 10 instead of degassing the inside of the bag 10. Otherwise, the bag 10 was produced using the packaging material 30 in the same manner as in Example 3. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 24.3 N, the bag 10 bent without the tear-open line 20 breaking, and the jig 51 slipped off to the first end portion 13 side.

[0118] (Comparative Example 4) Before sealing the bag 10, a gas was filled into the bag 10 instead of degassing the inside of the bag 10. Otherwise, the bag 10 was produced using the packaging material 30 in the same manner as in Example 4. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 14.6 N, the bag 10 bent without the tear-open line 20 breaking, and the jig 51 slipped off to the first end portion 13 side.

[0119] (Comparative Example 5) Before sealing the bag 10, a gas was filled into the bag 10 instead of degassing the inside of the bag 10. Otherwise, the bag 10 was produced using the packaging material 30 in the same manner as in Example 5. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 21.7 N, the bag 10 bent without the tear-open line 20 breaking, and the jig 51 slipped off to the first end portion 13 side.

[0120] The evaluation results in Examples 1 to 5 and Comparative Examples 1 to 5 are summarized and shown in FIG. 13. In the bags 10 in which internal degassing was performed according to Examples 1 to 5, the bending strength was 26 N or more. Also, when a force F3 of 26 N or more was applied to the bag 10, the tear-open line 20 broke before the contents of the bag 10 bent, so the bag 10 could be opened. In Examples 1 to 5, it is considered that the bending of the bag 10 occurred because the tear-open line 20 broke and the internal degassing state was eliminated, and the rigidity of the contents decreased.

[0121] On the other hand, in the bags 10 filled with gas inside according to Comparative Examples 1 to 5, the bending resistance was 25 N or less. Specifically, the contents and the bag 10 bent before the tear-open line 20 broke. For this reason, the bag 10 could not be opened.

[0122] (Example 6) Except for using the packaging material 30 having the layer structure shown in the above-mentioned fifth example, that is PET(12) / Printing layer(1) / Anchor coat layer(0.1) / PE(13) / Aluminum foil(6) / Anchor coat layer(0.1) / PE(13) / PE(30) The bag 10 was produced using the packaging material 30 in the same manner as in Example 1, except for using the packaging material 30 having the above layer structure. The non-through hole 201 was formed in the PET(12) / printing layer(1). Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 was 16.0 N, the tear-open line 20 broke and the bag 10 bent, and the jig 51 came out to the first end portion 13 side.

[0123] (Example 7) The bag 10 was produced using the packaging material 30 in the same manner as in Example 6, except that sprinkles were used as the contents. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 was 16.3 N, the tear-open line 20 broke and the bag 10 bent, and the jig 51 came out to the first end portion 13 side.

[0124] (Example 8) The bag 10 was produced using the packaging material 30 in the same manner as in Example 7, except that the dimension L1 in the longitudinal direction D1 of the non-sealed portion 18 of the bag 10 was 130 mm and the dimension L2 in the short transverse direction D2 of the non-sealed portion 18 was 30 mm. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 was 20.9 N, the tear-open line 20 broke and the bag 10 bent, and the jig 51 came out to the first end portion 13 side.

[0125] (Example 9) A bag 10 was produced using a packaging material 30 in the same manner as in Example 6, except that miscellaneous grains were used as the contents. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 reached 25.8 N, the easy-open seal line 20 broke, the bag 10 bent, and the jig 51 slipped off toward the first end portion 13 side.

[0126] (Example 10) A bag 10 was produced using a packaging material 30 in the same manner as in Example 6, except that a powdered detergent was used as the contents. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 reached 27.0 N, the easy-open seal line 20 broke, the bag 10 bent, and the jig 51 slipped off toward the first end portion 13 side.

[0127] (Comparative Example 6) A bag 10 was produced using a packaging material 30 in the same manner as in Example 6, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10 before sealing the bag 10. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 reached 11.6 N, the bag 10 bent without the easy-open seal line 20 breaking, and the jig 51 slipped off toward the first end portion 13 side.

[0128] (Comparative Example 7) A bag 10 was produced using a packaging material 30 in the same manner as in Example 7, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10 before sealing the bag 10. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 reached 14.4 N, the bag 10 bent without the easy-open seal line 20 breaking, and the jig 51 slipped off toward the first end portion 13 side.

[0129] (Comparative Example 8) A bag 10 was produced using a packaging material 30 in the same manner as in Example 8, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10 before sealing the bag 10. Subsequently, the bending resistance of the bag 10 was measured. As a result, when the force F3 reached 12.1 N, the bag 10 bent without the easy-open seal line 20 breaking, and the jig 51 slipped off toward the first end portion 13 side.

[0130] (Comparative Example 9) Before sealing the bag 10, the bag 10 was produced using the packaging material 30 in the same manner as in Example 9, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 8.3 N, the bag 10 bent without the tear-open line 20 breaking, and the jig 51 slipped off to the first end portion 13 side.

[0131] (Comparative Example 10) Before sealing the bag 10, the bag 10 was produced using the packaging material 30 in the same manner as in Example 10, except that instead of degassing the inside of the bag 10, gas was filled into the inside of the bag 10. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 10.9 N, the bag 10 bent without the tear-open line 20 breaking, and the jig 51 slipped off to the first end portion 13 side.

[0132] The evaluation results in Examples 6 to 10 and Comparative Examples 6 to 10 are collectively shown in FIG. 14. In the bags 10 in which degassing of the inside was carried out according to Examples 6 to 10, the bending strength was 16 N or more. Further, when a force F3 of 16 N or more was applied to the bag 10, the tear-open line 20 broke before the contents of the bag 10 bent, and the bag 10 could be opened. In Examples 6 to 10, the bending of the bag 10 is considered to have occurred because the tear-open line 20 broke and the degassed state inside was eliminated, and the rigidity of the contents decreased.

[0133] On the other hand, in the bags 10 in which gas was filled inside according to Comparative Examples 6 to 10, the bending strength was 15 N or less. Specifically, bending of the contents and the bag 10 occurred before the tear-open line 20 broke. For this reason, the bag 10 could not be opened.

Explanation of Reference Numerals

[0134] 10 Bag 11 Surface 12 Back surface 13 First end portion 131 First end portion seal portion 14 Second End 141 Second End Seal Part 15 Third End 16 Fourth End 17 Clasping Part 171 Clasping Part Seal Part 172 Tip 173 Base 18 Non - seal Part 181 First Non - seal Part 182 Second Non - seal Part 19 Contents 191 Granular Bodies 20 Easy - opening Line 201 Non - through Hole 21 Center Line 211 One End 212 The Other End 22 First Side Line 221 First Side Line on the First End Side 222 First Side Line on the Second End Side 23 Second Side Line 231 Second Side Line on the First End Side 232 Second Side Line on the Second End Side 24 Restraining Line 241 Restraining Line on the First End Side 242 Restraining Line on the Second End Side 30 Packaging Material 31 Base Material Layer 32 Sealing Layer 33 Adhesive Layer 41 Index Finger 42 Thumb

Claims

1. A bag formed of a packaging material including a first base material layer and a sealant layer, having a front surface and a back surface, and containing contents, having a first end portion and a second end portion that extend in the short side direction and face each other in the longitudinal direction, a third end portion and a fourth end portion that extend from the first end portion to the second end portion along the longitudinal direction and face each other in the short side direction, a first end portion seal portion and a second end portion seal portion that extend along the first end portion and the second end portion respectively and join the inner surfaces of the packaging material together, a non-seal portion located between the first end portion seal portion and the second end portion seal portion, where the inner surfaces of the packaging material are not joined, including an easy-opening line that includes a non-through hole formed on the outer surface side of the packaging material at the non-seal portion and extends at least partially in the short side direction, the easy-opening line is configured to cross the front surface in the short side direction and reach the back surface side, the non-seal portion is located adjacent to either the first end portion seal portion or the second end portion seal portion and includes a portion where the inner surfaces of the packaging material are in contact, the ratio of the dimension of the non-seal portion in the short side direction to the dimension of the non-seal portion in the longitudinal direction is 0.20 or more and 0.50 or less, the easy-opening line is located at the central portion of the non-seal portion in the longitudinal direction, the central portion is within a range of 0.1×L1 or less from the center of the non-seal portion in the longitudinal direction to the first end portion side and the second end portion side, where L1 is the dimension of the non-seal portion in the longitudinal direction, the dimension L1 of the non-seal portion in the longitudinal direction is 60 mm or more and 80 mm or less, the packaging material includes an adhesive layer, when a portion of the bag 1 cm away from the easy-opening line to the first end portion side is pressed from the front surface side to the back surface side with a portion of the bag located on the second end portion side of the easy-opening line fixed, the bending resistance, which is the force required to bend the bag, is 25 N or more, the contents include a plurality of granular bodies, the easy-opening line is provided at a portion of the packaging material that overlaps a plurality of granular bodies in contact with each other. A bag.

2. The bag according to claim 1, further comprising a clasp portion that extends along the longitudinal direction from the first end portion to the second end portion and where the packaging material is overlapped on the back surface side.

3. The bag according to claim 1 or 2, wherein the tear-open line extends along the short-side direction and includes a portion having a corrugated shape.

4. The tear-open line has at least a center line located on the surface and extending along the short-side direction, and a restraining line located on the back side and extending in a direction different from the direction in which the center line extends. The bag according to any one of claims 1 to 3.

5. The bag according to any one of claims 1 to 4, wherein the depth of the non-through hole of the tear-open line is 40 μm or less.

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