JP2022048290A - Bag having easily-opened seal line formed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag that enables a large opening to be formed.

SOLUTION: The bag is made of a packaging material that includes a first base material layer and a sealant layer, has front and rear surfaces, and houses a content. The bag is provided with: first and second ends that extend in a short direction and face each other in a longitudinal direction; third and fourth ends that extend from the first end to the second end along the longitudinal direction, and face each other in the short direction; first and second end sealed parts that respectively extend along the first and second ends and join the inner surfaces of the packaging material; an unsealed part that is positioned between the first and second end sealed parts and in which the inner surfaces of the packaging material are not joined; and an easily-opened seal line that includes a non-through hole formed in the outer surface side of the packaging material in the unsealed part. The easily-opened seal line is configured to cross the front surface in the short direction and reach the rear surface side.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

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

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

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

Japanese Patent No. 5428647A

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

An object of the present invention is to provide a bag capable of effectively solving such a problem.

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 the contents.
The first and second ends, which extend in the lateral direction and face each other in the longitudinal direction,
With the third and fourth ends extending from the first end to the second end along the longitudinal direction and facing each other in the lateral direction.
A first-end seal portion and a second-end seal portion that extend along the first end portion and the second end portion and join the inner surfaces of the packaging materials to each other.
A non-seal portion located between the first end seal portion and the second end seal portion and to which the inner surfaces of the packaging materials are not joined to each other.
The non-seal portion includes an easy-opening wire including a non-through hole formed on the outer surface side of the packaging material.
The easy-opening line is configured to cross the front surface in the lateral direction and reach the back surface side.
The easy-open line is located at the center of the unsealed portion in the longitudinal direction.
The central portion is within 0.1 × L1 from the center of the non-sealed portion in the longitudinal direction to the first end portion side and the second end portion side, and L1 is the said in the longitudinal direction. It is a bag, which is the size of the non-sealed part.

In the bag according to the present invention, the non-sealed portion is located adjacent to either the first end sealed portion or the second end sealed portion, and the inner surfaces of the packaging materials are in contact with each other. May include.

In the bag according to the present invention, the ratio of the dimension of the non-sealed portion in the lateral direction to the dimension of the non-sealed portion in the longitudinal direction may be 0.20 or more and 0.50 or less.

In the bag according to the present invention, the easy-opening line is located at least on the front surface and extends in a direction different from the direction in which the center line extends in a direction different from the center line located on the lateral side and the back surface side. It may have a deterrent line.

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 the contents.
The first and second ends, which extend in the lateral direction and face each other in the longitudinal direction,
With the third and fourth ends extending from the first end to the second end along the longitudinal direction and facing each other in the lateral direction.
A first-end seal portion and a second-end seal portion that extend along the first end portion and the second end portion and join the inner surfaces of the packaging materials to each other.
A non-seal portion located between the first end seal portion and the second end seal portion and to which the inner surfaces of the packaging materials are not joined to each other.
The non-seal portion includes a non-through hole formed on the outer surface side of the packaging material, and at least partially includes an easy-opening wire extending in the lateral direction.
The non-seal portion includes a portion located adjacent to either the first end seal portion or the second end seal portion and in which the inner surfaces of the packaging materials are in contact with each other.
The ratio of the dimension of the non-sealed portion in the lateral direction to the dimension of the non-sealed portion in the longitudinal direction is 0.20 or more and 0.50 or less.
The easy-open line is located at the center of the unsealed portion in the longitudinal direction.
The central portion is within 0.1 × L1 from the center of the non-sealed portion in the longitudinal direction to the first end portion side and the second end portion side, and L1 is the said in the longitudinal direction. It is a bag, which is the size of the non-sealed part.

In the bag according to the present invention, when the packaging material contains an adhesive layer, the easy-opening of the bag is carried out with the portion of the bag located on the second end side of the easy-opening line fixed. When a portion 1 cm away from the wire to the first end side is pressed from the front surface side to the back surface side, the bending proof stress, which is the force required to bend the bag, is preferably 25 N or more.

In the bag according to the present invention, when the packaging material does not contain an adhesive layer, the easy opening line of the bag is fixed in a state where the portion located on the second end side of the easy opening line is fixed. When a portion 1 cm away from the opening wire to the first end side is pressed from the front surface side to the back surface side, the bending proof stress, which is the force required to bend the bag, is preferably 15 N or more.

The bag according to the present invention may further include a gassho portion extending from the first end portion to the second end portion along the longitudinal direction and on the back surface side on which the packaging material is overlapped.

In the bag according to the present invention, the contents may contain a plurality of granules.

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.

In the bag according to the present invention, the easy-opening line may include a portion extending along the lateral direction and having a wavy shape.

According to the present invention, a large opening can be formed in the bag. Therefore, it is possible to improve the ease of taking out the contents.

It is a top view which shows the bag in embodiment of this invention. It is sectional drawing which looked at the bag of FIG. 1 from the direction of II-II. It is sectional drawing which looked at the bag of FIG. 1 from the direction of III-III. It is sectional drawing which shows the contents contained in a bag in an enlarged manner. It is sectional drawing which looked at the bag of FIG. 1 from the VV direction. It is a top view which shows the state of opening the bag shown in FIG. 1. It is a top view which shows the bag in the opened state. FIG. 7 is a view of the opening shown in FIG. 7 as viewed from the direction of arrow VIII. It is a top view which shows the easy-opening line of the bag which concerns on one modification by enlargement. It is a top view which shows the easy-opening line of the bag which concerns on one modification by enlargement. It is a top view which shows the easy-opening line of the bag which concerns on one modification by enlargement. It is a figure explaining the method of measuring the bending strength of a bag. It is a figure explaining the method of measuring the bending strength of a bag. It is a figure which shows the evaluation result of Examples 1-5 and Comparative Examples 1-5. It is a figure which shows the evaluation result of Examples 6 to 10 and Comparative Examples 6 to 10.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

In addition, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle, etc., which specify the shape and geometric conditions and their degrees as used in the present specification, are strictly referred to. Without being bound by the meaning, we will interpret it including the range where similar functions can be expected.

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

The bag 10 includes an easy-opening wire 20 provided on the front surface 11 and the back surface 12. In the bag 10 according to the present embodiment, an opening is formed in the bag 10 by breaking the bag 10 along the easy-opening line 20, and the contents 19 are taken out through the opening. The method is envisioned.

The contents contained in the bag 10 are not particularly limited as long as they can be taken out from the bag 10 broken along the easy-open line 20. For example, the contents to be filled in the bag 10 include liquids such as pon vinegar, dressings and liquid detergents, viscous substances such as mayonnaise, ketchup, shampoo and rinse, powdered substances such as powdered seasonings, and granular substances such as rice. , A fluid having fluidity can be mentioned.

Hereinafter, the configuration of the bag 10 will be described. 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 lateral direction D2 of the bag 10. The third end 15 and the fourth end 16 extend from the first end 13 to the second end 14 along the longitudinal direction D1.

The longitudinal direction D1 is a transport direction of the packaging material 30 when the bag 10 is manufactured from the film-shaped packaging material 30, and is a so-called MD (Machine Direction). In the example shown in FIG. 1, the lateral 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. 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.

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

(Seal part)
The bag 10 includes a sealing portion for joining the inner surfaces of the film-shaped packaging material 30 to each other. The seal portion includes a first end seal portion 131 extending along the first end portion, a second end seal portion 141 extending along the second end portion 14, and a gassho portion seal portion 171 located at the gassho portion 17. including. The method for forming the sealing portion is not particularly limited as long as the inner surfaces of the packaging materials 30 can be joined to each other to seal the bag 10. For example, a seal portion may be formed by melting a part of the packaging material 30 by heating or the like and welding the inner surfaces of the packaging material 30 to each other. Alternatively, the sealing portion may be formed by adhering the inner surfaces of the packaging materials 30 to each other using an adhesive or the like.

As shown in FIG. 1, the gassho portion seal portion 171 extends in the longitudinal direction D1 from the first end portion seal portion 131 to the second end portion seal portion 141. As shown in FIG. 2, the gassho portion seal portion 171 may extend to the tip portion 172 of the gassho portion 17 in the lateral direction D2, or although not shown, the gassho portion seal portion 171 has a tip portion. It does not have to extend to 172. Further, the gassho portion seal portion 171 may extend to the base portion 173 of the gassho portion 17 in the lateral direction D2, or, although not shown, the gassho portion seal portion 171 does not extend to the base portion 173. May be good.

(Non-sealed part)
Further, the bag 10 includes a non-sealing portion 18 in which the inner surfaces of the packaging materials 30 are not joined to each other. FIG. 3 is a cross-sectional view of the bag 10 of FIG. 1 as viewed from the direction III-III. As shown in FIG. 3, the unsealed portion 18 is a portion in which 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 a first unsealed portion 181). In the first unsealed 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 come into contact with the content 19. You may be.

Further, the non-seal portion 18 includes 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 with each other (hereinafter, also referred to as a second non-sealing portion 182). You may go out. In the example shown in FIG. 3, the non-seal portion 18 includes a second non-seal portion 182 adjacent to the first end seal portion 131 and a second non-seal portion 182 adjacent to the second end seal portion 141. .. Although not shown, the non-seal portion 18 may include only the second non-seal portion 182 adjacent to either the first end seal portion 131 or the second end seal portion 141.

The first non-seal portion 181 and the second non-seal portion 182 charge the contents 19 into the bag 10 in a partially opened state, and then release the air inside the bag 10 to the outside, and then release the air inside the bag 10 to the outside. It is formed by forming a sealing portion along the opening and sealing the bag 10. The portion where the inner surface of the packaging material 30 is in contact with the content 19 is the first non-sealing portion 181 and the portion where the inner surfaces of the packaging material 30 are in contact with each other is the second non-sealing portion 182.

Hereinafter, the advantage of releasing the air inside the bag 10 to the outside, that is, degassing, will be described. Here, as shown in FIG. 4, a case where the content 19 contains a plurality of granules 191 will be described. In this case, by degassing the inside of the bag 10, a plurality of granules 191 can be brought into contact with each other as shown in FIG. 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 granules 191. As a result, the ratio of the space inside the bag 10 in which the granules 191 do not exist can be reduced, and the fluidity of each of the granules 191 can be reduced. For example, when the bag 10 is repeatedly shaken in the longitudinal direction D1 while the bag 10 is held by hand, the contact state of each granular material 191 can be maintained. As a result, the entire contents 19 can have a predetermined rigidity. For example, when the bag 10 is gripped on the first end 13 side of the bag 10 and the bag 10 is lifted so that the front surface 11 and the back surface 12 are parallel to each other in the horizontal direction, the contents 19 are prevented from bending. Further, when a force is applied to the bag 10, it is possible to prevent the contents 19 and the bag 10 from being bent before the easy-opening wire 20 is broken. Therefore, as will be described later, it becomes easy to apply a force to the bag 10 such that the bag 10 is bent in the longitudinal direction D1 to generate tension in the packaging material 30 on the surface 11. Therefore, the bag 10 can be broken along the easy-opening line 20 based on the tension applied to the packaging material 30 on the surface 11.

The size and weight of the granular material 191 are preferably within a range in which the entire content 19 can have a predetermined rigidity when the inside of the bag 10 is degassed. For example, the average particle size of the granular material 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 material 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.

In FIG. 1, reference numeral L1 represents the dimension of the unsealed portion 18 in the longitudinal direction D1, and reference numeral L2 represents the dimension of the unsealed portion 18 in the lateral 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. This allows 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.

The ratio of the dimension L2 to the dimension L1 is, for example, 0.10 or more, 0.20 or more, or 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, or may be 0.50 or less.

Some specific examples of dimensions L1, 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

When the bag 10 is sealed with the inside of the bag 10 degassed, the pressure inside the bag 10 is lower than the atmospheric pressure. Therefore, when a part of the bag 10 is broken and the inside of the bag 10 is communicated with the outside, air flows into the inside of the bag 10 and the bag 10 inflates at least partially. Therefore, 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 breaking a part of the bag 10.

(Easy opening line)
Next, the easy-open line 20 will be described. The easy-opening wire 20 is a linear portion of the packaging material 30 located in the non-sealing portion 18 that is configured to easily break.

The easy-open line 20 includes at least the 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 the bag 10 is viewed 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 gassho portion 17 coincides with the center line C.

The easy-open line 20 is preferably located at the center of the unsealed portion 18 in the longitudinal direction D1. The central portion is, for example, a range within 0.1 × L1 from the center of the unsealed portion 18 in the longitudinal direction D1 to the first end portion 13 side and the second end portion 14 side.

In the present embodiment, as shown in FIGS. 1 and 2, the center line 21 crosses the front surface 11 in the lateral direction D2 and reaches the back surface 12 side. For example, the center line 21 extends linearly from the front surface 11 side to the back surface 12 side via the third end portion 15, and is terminated at one end 211. Further, the center line 21 extends linearly from the front surface 11 side to the back surface 12 side via the fourth end portion 16 and ends at the other end 212.

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 lateral direction D2 so as to sandwich the base portion 173 of the gassho portion 17. The distance S1 between one end 211 and the other end 212 in the lateral direction D2 is, for example, 2 mm or more and 10 mm or less.

The distance S1 may be set with respect to the entire circumference of the bag 10 in the cross-sectional view taken along the lateral direction D2 shown in FIG. The ratio of the distance S1 to the entire circumference of the bag 10 is preferably 20% or less, and more preferably 10% or less. In other words, the ratio of the length of the easy-opening line 20 to the entire circumference of the bag 10 is preferably 80% or more, more preferably 90% or more. The entire circumference of the bag 10 includes the lengths of the front surface 11, the back surface 12, the third end portion 15 and the fourth end portion 16 of the packaging material 30, but includes the length of the portion of the gassho portion 17. do not have.

Next, the structure of the easy-opening wire 20 formed on the packaging material 30 will be described with reference to FIG. 5 together with the layer structure of the packaging material 30. FIG. 5 is a cross-sectional view of the bag 10 of FIG. 1 as viewed from the VV direction.

First, the layer structure 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 composed 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. The thickness of the packaging material 30 is, for example, 150 μm or less, more preferably 100 μm or less, and further preferably 80 μm or less.

Examples of the material constituting the base material layer 31 include 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). Such as stretched plastic film can be used. The stretched plastic film may be stretched in two axes in the longitudinal direction D1 and the lateral direction D2. As the base material layer 31, a biaxially stretched plastic film that easily tears in the lateral direction D2 may be used. Examples of such a film include "Trefan YT42", which is a biaxially stretched polypropylene film manufactured by Toray Industries, Inc., and "Emblet 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.

As the material constituting the sealant layer 32, for example, polyethylene or polypropylene (PP) such as ethylene-methacrylic acid copolymer (EMMA), low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) is used. Can be done. The sealant layer 32 is preferably unstretched. The thickness of the sealant layer 32 may be, for example, 60 μm or less, 50 μm or less, or 30 μm or less. 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 may be composed of a plurality of layers.

Although not shown, the packaging material 30 may further include a print layer including a print display for showing product information or giving a aesthetic impression 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 print display include characters, numbers, symbols, figures, and patterns.

Further, although not shown, 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.

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 an aluminum foil. Further, the functional layer may be a thin-film deposition layer or a resin layer provided on the base material layer 31 or the sealant layer 32. The thin-film deposition layer contains a substance having a gas barrier property, for example, an inorganic substance such as aluminum or an inorganic oxide such as aluminum oxide or silicon oxide. The thickness of the thin-film 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 a resin material having a gas barrier property, for example, an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), and an aromatic polyamide such as nylon MXD6. By providing such a functional layer having a gas barrier property, it is possible to suppress the infiltration of oxygen and water vapor into the inside of the bag 10.

Next, the structure of the easy-opening wire 20 will be described. As shown in FIG. 5, the easy-opening wire 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-penetrating hole 201 is configured to penetrate the base material layer 31 and reach the adhesive layer 33. Although not shown, the non-penetrating hole 201 may be configured so as not to penetrate the base material layer 31.

The width S2 and depth S3 of the non-penetrating hole 201 of the easy-opening wire 20 are set so that the easy-opening wire 20 breaks when the user applies an appropriate force to the bag 10. For example, the width of the non-through hole 201 of the easily opened wire 20 is 80 μm or more and 1 mm or less. 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 a laser beam from the outer surface 302 side to process the packaging material 30.

The ease with which the easy-opening wire 20 is broken when a force is applied to the bag 10 depends on the composition, thickness, and the like of the portion of the packaging material 30 in which the non-through hole 201 is not formed (hereinafter, also referred to as a residual portion). Dependent. The residual portion comprises at least the sealant layer 32. The residual portion further includes an adhesive layer, an anchor coat layer, an adhesive resin layer, a uniaxially stretched film, and a functional layer, depending on the method of forming the non-through hole 201 and the layer structure of the packaging material 30. The configuration of the residual portion is set so that the residual portion appropriately breaks within the range of the force assumed to be applied to the easy-opening wire 20. When the packaging material contains an adhesive layer, the bending strength of the bag 10 tends to be strong, and when the packaging material does not include the adhesive layer, the bending strength of the bag 10 tends to be weak. The bending strength of the bag 10 will be described later.
The thickness of the residual portion is set so that the residual portion appropriately breaks within the range of the force assumed to be applied to the easy-opening wire 20. The thickness of the residual portion is, for example, 80 μm or less, 60 μm or less, or 50 μm or less.

(Adhesive layer)
The adhesive layer is used when one layer and the other layer are bonded together by using the dry laminating method. The adhesives constituting the adhesive layer include one-component or two-component curable or non-curable vinyl-based, (meth) acrylic-based, polyamide-based, polyester-based, polyether-based, polyurethane-based, and epoxy-based adhesives. A polyacrylic acid ester consisting of a rubber-based adhesive, a polyvinyl acetate-based adhesive, a homopolymer such as ethyl, butyl, or 2-ethylhexyl ester of acrylic acid, or a copolymer of these with methyl methacrylate, acrylonitrile, styrene, or the like. Ethylene Copolymerization Adhesives, Cellulose Adhesives, Polyester Adhesives, etc. Consisting of Adhesives, Cyanoacrylate Adhesives, Copolymers of Ethylene with Vinyl Acetate, Ethyl Acrylic Acid, Acrylic Acid, Methacrylic Acid, etc. Amino resin adhesives consisting of agents, polyamide adhesives, polyimide adhesives, urea resins or melamine resins, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, reactive (meth) acrylic acid adhesives. It is possible to use adhesives, inorganic adhesives made of chloroprene rubber, nitrile rubber, styrene-butadiene rubber, silicone adhesives, alkali metal silicates, inorganic adhesives made of low melting point glass, and other adhesives. can. More preferably, for example, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and polymethylene polyphenylene polyisocyanate, or polyfunctional isocyanates such as aliphatic polyisocyanates such as hexamethylene diisocyanate and xylylene diisocyanate, and polyether polyols. , Polyurethane-based resin, which is a cured product of polyester-based polyol, polyacrylate polyol, and other hydroxyl group-containing compounds, is the main component. According to these, it is possible to form a thin film having abundant flexibility and flexibility, improve its tensile elongation, act as a film having flexibility, flexibility, etc., and is suitable for processing such as laminating and printing. Can be improved.
By applying the above adhesive using, for example, a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a fonten method, a transfer roll coating method, or another coating method, and drying the solvent. , The adhesive layer can be formed.
The amount of the adhesive applied is preferably 1.5 g / m ² or more and 10 g / m ² or less (dry state), and more preferably 3 g / m ² or more and 5 g / m ² or less (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.

(Anchor coat layer)
When laminating the adhesive resin layer by using the melt extrusion method or the melt extrude laminating method, it is preferable to apply an anchor coating agent in advance to the layer on which the adhesive resin layer is laminated to form the anchor coat layer.
Examples of the anchor coating agent constituting the anchor coating layer include an organic titanium-based anchor coating agent such as alkyl titanate, an isocyanate-based anchor coating agent, a polyethyleneimine-based anchor coating agent, a polybutadiene-based anchor coating agent, and an isocyanate-based (urethane-based) agent. , Polyethyleneimine-based, and other anchor coating agents can be exemplified.
More preferably, for example, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylenepolyphenylene polyisocyanate, or aliphatic polyisocyanates such as hexamethylene diisocyanate and xylylene diisocyanate, etc. A product containing a polyurethane resin as a main component, which is a cured product of a polyfunctional isocyanate and a polyether polyol, a polyester polyol, a polyacrylate polyol, or another hydroxyl group-containing compound, can be preferably used. It is possible to improve the adhesion between the layers constituting the packaging material.
The anchor coating agent is applied by using, for example, a roll coating method, a gravure coating method, a knife coating method, a dip coating method, a spray coating method, or another coating method, and the solvent is dried to form an anchor coating layer. can do.
The amount of the anchor coating agent applied is preferably 0.1 g / m ² or more and 0.5 g / m ² or less (dry state). The thickness of the anchor coat layer in the dry state is 0.5 μm or less, preferably 0.1 μm or less.

(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, a copolymer with low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, and ethylene / α-olefin polymerized using a metallocene catalyst. Polyethylene (PE), ethylene / polypropylene copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer, ethylene / methacrylic acid copolymer, ethylene / methacryl A resin obtained by graft-polymerizing or copolymerizing an unsaturated carboxylic acid, an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer on a methyl acid copolymer, an ethylene / maleic acid copolymer, an ionomer, or a polyolefin resin. , A resin obtained by graft-modifying maleic anhydride to a polyolefin resin or the like can be used. These materials can be used in combination of one or more.
In the present invention, the thickness of the adhesive resin layer is preferably 5 μm or more and 30 μm or less, preferably 10 μm or more and 120 μm or less. Further, the adhesive resin layer may be not only a single layer but also two or more layers. In that case, the thickness of each layer can be set in a timely manner according to the physical characteristics (heat adhesiveness, waist of the film, etc.) required for the packaging material.

(Uniaxial stretched film)
In the present invention, the uniaxially stretched film refers to a film stretched only in the lateral direction D2. Examples of such a film include "Kararyan Y", which is a high-density polyethylene film manufactured by Denka Corporation.

An example of the layer structure of the packaging material 30 is as follows.
First example: Base material layer / Print layer / Adhesive layer / Sealant layer Second example: Base material layer / Print layer / Adhesive layer / Metal vapor deposition layer / Sealant layer Third example: Base material layer / Print layer / Adhesive Agent layer / uniaxially stretched film / adhesive layer / sealant layer 4th example: base material layer / printing layer / anchor coat layer / adhesive resin layer / uniaxially stretched film / anchor coat layer / sealant layer 5th example: base material layer / Print layer / Anchor coat layer / Adhesive resin layer / Metal foil / Anchor coat layer / Adhesive resin layer / Sealant layer Sixth example: Base material layer / Print layer / Anchor coat layer / Adhesive resin layer / Sealant layer

Specific examples of the 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) / printed 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)
Example 6: Ny (15) / Print layer (1) / Anchor coat layer (0.1) / PE (13) / PE (30)
In the first to sixth examples, the plastic films constituting the base material layer are all biaxially stretched plastic films, and the sealant layers are all unstretched. The numerical values in parentheses represent the thickness of each layer. The unit of thickness is μm.

In the packaging material 30, the non-penetrating 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.

In the packaging material 30 of the first example, the case where the non-through hole 201 is formed in the "PET (12) / printing layer (1)" and the "adhesive (3) / PE (50)" becomes a residual portion. , The non-through hole 201 may be formed in the "PET (12) / printing layer (1) / adhesive layer (3)", and the "PE (50)" may become a residual portion. In the former case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is 13 μm, and the thickness of the residual portion is 53 μm. In the latter case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is larger than 13 μm and 16 μm or less, and the thickness of the residual portion is 50 μm or more and less than 53 μm. The total thickness of the packaging material 30 is 66 μm.

In the packaging material 30 of the second example, the non-through hole 201 is formed in the “PP (25) / printed layer (1)”, and the “adhesive layer (3) / aluminum vapor deposition layer (0.05) / PP (30)) is formed. Is a residual portion, and non-through holes 201 are formed in "PP (25) / printed layer (1) / adhesive layer (3)", and "aluminum-deposited layer (0.05) / PP (30)". May be a residual part. In the former case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is 26 μm, and the thickness of the residual portion is 33.05 μm. In the latter case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is larger than 26 μm and 29 μm or less, and the thickness of the residual portion is 30.05 μm or more and less than 33.05 μm. The total thickness of the packaging material 30 is 59.05 μm.

In the packaging material 30 of the third example, the non-through hole 201 is formed in the "Ny (15) / printing layer (1)", and the "adhesive layer (3) / uniaxially stretched HDPE (18) / adhesive layer (adhesive layer) ( Non-through holes 201 are formed in "Ny (15) / printing layer (1) / adhesive layer (3)" when "3) / PE (40)" becomes a residual portion, and "uniaxially stretched HDPE (18)" is formed. ) / Adhesive layer (3) / PE (40) ”may be a residual part. In the former case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is 16 μm, and the thickness of the residual portion is 64 μm.
In the latter case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is larger than 16 μm and 19 μm or less, and the thickness of the residual portion is 61 μm or more and less than 64 μm. The total thickness of the packaging material 30 is 80 μm.

In the packaging material 30 of the fourth example, the non-through hole 201 is formed in the "PET (12) / printing layer (1)", and the "anchor coat layer (0.1) / PE (15) / uniaxially stretched HDPE (18)" is formed. When "/ anchor coat layer (0.1) / PE (30)" becomes a residual portion, non-through holes 201 are formed in "PET (12) / printed layer (1) / anchor coat layer (0.1)", and " "PE (15) / uniaxially stretched HDPE (18) / anchor coat layer (0.1) / PE (30)" may be a residual portion. In the former case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is 13 μm, and the thickness of the residual portion is 63.2 μm. In the latter case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is larger than 13 μm and is 13.1 μm or less, and the thickness of the residual portion is 63.1 μm or more and less than 63.2 μm. The total thickness of the packaging material 30 is 75.2 μm.

In the packaging material 30 of the fifth example, the non-through hole 201 is formed in the "PET (12) / printing layer (1)", and the "anchor coat layer (0.1) / PE (13) / aluminum foil (6) / Non-through holes 201 are formed in the case where "anchor coat layer (0.1) / PE (13) / PE (30)" is a residual portion and in "PET (12) / printed layer (1) / anchor coat layer (0.1)". It may be formed and "PE (13) / aluminum foil (6) / anchor coat layer (0.1) / PE (13) / PE (30)" may be a residual portion. In the former case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is 13 μm, and the thickness of the residual portion is 62.2 μm. In the latter case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is larger than 13 μm and is 13.1 μm or less, and the thickness of the residual portion is 62.1 μm or more and less than 62.2 μm. The total thickness of the packaging material 30 is 75.2 μm.

In the packaging material 30 of the sixth example, the non-through hole 201 is formed in the "Ny (15) / printing layer (1)", and the "anchor coat layer (0.1) / PE (13) / PE (30)" is formed. When it becomes a residual part, a non-through hole 201 is formed in Ny (15) / printing layer (1) / anchor coat layer (0.1) ", and" PE (13) / PE (30) "becomes a residual part. In some cases. In the former case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is 16 μm, and the thickness of the residual portion is 43.1 μm. In the latter case, the thickness of the portion of the packaging material 30 in which the non-through hole 201 is formed is larger than 16 μm and less than 16.1 μm, and the thickness of the residual portion is 43. It is μm or more and less than 43.1 μm. The total thickness of the packaging material 30 is 59.1 μm.

Bag Manufacturing Method Next, an example of the method for manufacturing the bag 10 described above will be described.

First, a long packaging material 30 is prepared. Next, the non-through hole 201 of the easy-open line 20 is formed on the outer surface 302 of the packaging material 30 while the packaging material 30 is conveyed along the MD of the packaging material 30. Subsequently, the packaging material 30 is bent into a tubular body. After that, the inner surfaces 301 facing each other in the cylindrical body are pressed while being heated to form the second end sealing portion 141.

Subsequently, the content 19 is charged into the inside of the tubular body. Further, the parts of the packaging material 30 constituting the tubular body, which overlap in the transport direction, are pressed while being heated to form the gassho portion sealing portion 171.

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

Next, at the positions of the first end sealing portion 131 and the second end sealing portion 141, the packaging material 30 constituting the tubular body is cut in a direction orthogonal to the transport direction. In this way, the bag 10 whose inside is degassed can be obtained.

Method of opening a bag Next, a method of opening the above-mentioned bag 10 will be described with reference to FIGS. 6 and 7.

First, as shown in FIG. 6, the user attaches the index finger 41 of one hand to the first end portion 13 and the thumb 42 of one hand to the second end portion 14, for example, to attach the bag 10. Hold. Subsequently, a force for bending the bag 10 toward the back surface 12 in the longitudinal direction D1 is applied to the bag 10. For example, as shown in FIG. 6, a force F1 toward the back surface 12 side and the second end portion 14 side is applied to the bag 10 from the first end portion 13 side. Further, a force F2 toward the back surface 12 side and the first end portion 13 side is applied to the bag 10 from the second end portion 14 side.

Here, in the present embodiment, as described above, the content 19 housed inside the bag 10 contains a plurality of granules 191 and the inside of the bag 10 is degassed. Therefore, the entire content 19 has a predetermined rigidity. Therefore, the force F1 and the force F2 shown in FIG. 6 each function as a force for bending the entire rigid content 19 toward the back surface 12.

When the force F1 and the force F2 exceed the rigidity of the entire content 19, the entire content 19 bends toward the back surface 12, and at this time, 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-opening line 20 is formed on the packaging material 30 constituting the surface 11. Therefore, the packaging material 30 constituting the surface 11 can be broken along the center line 21 to form the opening 25 in the bag 10 as shown in FIG. 7.

Further, in the present embodiment, as described above, the center line 21 of the easy-opening 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.

FIG. 8 is a view of the opening 25 shown in FIG. 7 as viewed from the direction of arrow VIII. In the present embodiment, the center line 21 of the easy-opening line 20 extends to the back surface 12 side. Therefore, as compared with the case where the easy-opening line 20 is formed only on the surface 11 side, the length of the contour of the opening 25 on the first end 13 side and the opening 25 on the second end 14 side The length of each contour can be increased. As a result, the area of the opening 25 can be increased, and the ease of taking out the contents 19 can be improved.

It is possible to make various changes to each of the above-described embodiments. Hereinafter, a modified example will be described. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding portions in the above-described embodiments will be used for the portions that can be configured in the same manner as in each of the above-described embodiments. , Omit duplicate explanations. Further, when it is clear that the action and effect obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
In the above-described embodiment, an example is shown in which the easy-opening line 20 such as the center line 21 extends linearly. In this modification, an example in which the easily opened wire 20 such as the center wire 21 includes a portion having a wavy shape will be described. FIG. 9 is a plan view showing a case where the bag 10 according to the present modification is viewed from the surface 11 side.

In this modification, as shown in FIG. 9, the center line 21 extending in the lateral direction D2 has a wavy shape. For example, the center line 21 includes a mountain 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 tension is applied to the packaging material 30 constituting the surface 11, the tension is concentrated on the peak 203 or the valley 204. Therefore, the breakage along the easy-opening line 20 is likely to start.

In FIG. 9, reference numeral S4 represents the period of the wave shape in the lateral direction D2, and reference numeral S5 represents the amplitude of the wave shape. The period S4 is, for example, 2 mm or more and 13 mm or less. Further, the amplitude S5 is, for example, 1 mm or more and 5 mm or less.

(Second modification)
In this modification, an example in which the easy-opening line 20 includes a plurality of lines will be described. FIG. 10 is a plan view showing a case where the bag 10 according to the present modification is viewed from the surface 11 side.

In the example shown in FIG. 10, the easy-opening wire 20 is connected to the center wire 21 located on the surface 11 side, the first side wire 22 connected to one end 211 of the center wire 21, and the other end 212 of the center wire 21. It has a second side line 23 and the like.

The first side line 22 is the first side line 221 on the first end side located on the first end 13 side of the center line 21, and the first side line 221 on the first end side and the center line 21. It has a second end side first side line 222 located on the second end 14 side. Both the first side line 221 on the first end side and the first side line 222 on the second end side of the first side line 22 extend to the back surface 12 via the third end portion 15.

The second side line 23 is the second side line 231 on the first end side located on the first end 13 side of the center line 21, and the second side line 231 on the first end side and the center line 21. It has a second end side second side line 232 located on the second end 14 side. Both the second side line 231 on the first end side and the second side line 232 on the second end side of the second side line 23 extend to the back surface 12 via the fourth end portion 16.

Hereinafter, the operation of the bag 10 shown in FIG. 10 will be described. When a force for bending the bag 10 toward the back surface 12 in the longitudinal direction D1 is applied to the bag 10, tension is applied to the packaging material 30 constituting the front surface 11 as described above. 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 a line located on the first end 13 side, for example, a first side line 221 on the first end side or a second side line on the first end side. Join 231. Further, the tension applied to the packaging material 30 from the second end 14 side is a line located on the second end 14 side, for example, the first side line 222 on the second end side or the second side line 232 on the second end side. Join in. As described above, in the first side line 22 and the second side line 23, the tension from the first end portion 13 side and the tension from the second end portion 14 side are applied to different lines.

On the other hand, in the central portion in the lateral direction D2, both the tension from the first end portion 13 side and the tension from the second end portion 14 side are applied to the center line 21. Therefore, the center line 21 is more likely to break because the force is applied more intensively than the first side line 22 and the second side line 23. Therefore, in the present embodiment, the breakage along the center line 21 is likely to start.

After the center line 21 is broken, in the first side line 22, the break progresses in either the first side line 221 on the first end side or the first side line 222 on the second end side, and the back surface 12 side. To. Further, also in the second side line 23, breakage progresses at either the first end side second side line 231 or the second end side second side line 232 to reach the back surface 12 side.

In FIG. 10, reference numeral S6 represents the dimension of the center line 21 in the lateral direction D2, and reference numeral S7 is between the first side line 221 on the first end side and the first side line 222 on the second end side. Represents the maximum spacing in the longitudinal direction D1. The dimension S6 is set so that tension can be easily concentrated 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 distance in the longitudinal direction D1 between the second side line 231 on the first end side and the second side line 232 on the second end side is also the same as the maximum distance S7.

(Third modification example)
In this modification, an example in which the easy-opening line 20 includes the suppression line 24 will be described. FIG. 11 is a plan view showing a case where the bag 10 according to the present modification is viewed from the back surface 12 side.

In the example shown in FIG. 11, the easy-opening wire 20 includes a center wire 21 extending from the front surface 11 side to the back surface 12 side, a restraining wire 24 connected to one end 211 of the center wire 21, and the other end of the center wire 21. It has a deterrent line 24 connected to 212. The restraint 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 restraint line 24 extends along the longitudinal direction D1 orthogonal to the lateral direction D2 where the center line 21 extends.
Therefore, the progress of the break can be stopped at the suppression line 24.

As shown in FIG. 11, the deterrence line 24 includes a first end side deterrence line 241 extending from one end 211 or the other end 212 of the center line 21 toward the first end 13 side, and one end 211 or the like of the center line 21. It may include a second end side restraint line 242 extending from the end 212 to the second end 14 side.
Alternatively, although not shown, the deterrence line 24 may include only one of the first end side deterrence line 241 and the second end side deterrence line 242.

Although some modifications to the above-described embodiments have been described, it is naturally possible to apply a plurality of modifications in combination as appropriate.

(Other aspects)
Another aspect of the present invention is a bag made of a packaging material containing a first substrate layer and a sealant layer, having a front surface and a back surface, and containing contents, extending in the lateral direction and extending in the longitudinal direction. The first and second ends facing each other, and the third and fourth ends extending from the first end to the second end along the longitudinal direction and facing each other in the lateral direction. The first end seal portion and the second end seal portion extending along the first end portion and the second end portion, respectively, and joining the inner surfaces of the packaging materials to each other, and the first end seal portion. A non-seal portion located between the portion and the second end sealing portion where the inner surfaces of the packaging material are not joined to each other, and a non-penetrating hole formed on the outer surface side of the packaging material in the non-sealing portion. The easy-opening line includes, and the easy-opening line is a bag configured to cross the front surface in the lateral direction and reach the back surface side.

In a bag according to another aspect of the present invention, the non-sealed portion is located adjacent to either the first end sealed portion or the second end sealed portion, and the inner surfaces of the packaging materials are in contact with each other. It may include the part that is used.

In the bag according to another aspect of the present invention, the ratio of the dimension of the non-sealed portion in the lateral direction to the dimension of the non-sealed portion in the longitudinal direction may be 0.20 or more and 0.50 or less. ..

In the bag according to another aspect of the present invention, the easy-opening line is located at least on the front surface and extends along the lateral direction, and the center line is located on the back surface side and extends in the direction in which the center line extends. It may have a deterrent line extending in different directions.

Another aspect of the present invention is a bag made of a packaging material containing a first substrate layer and a sealant layer, having a front surface and a back surface, and containing contents, extending in the lateral direction and extending in the longitudinal direction. The first and second ends facing each other, and the third and fourth ends extending from the first end to the second end along the longitudinal direction and facing each other in the lateral direction. The first end seal portion and the second end seal portion extending along the first end portion and the second end portion, respectively, and joining the inner surfaces of the packaging materials to each other, and the first end seal portion. A non-seal portion located between the portion and the second end sealing portion where the inner surfaces of the packaging material are not joined to each other, and a non-penetrating hole formed on the outer surface side of the packaging material in the non-sealing portion. The unsealed portion is located adjacent to either the first end sealed portion or the second end sealed portion. The ratio of the dimension of the non-sealed portion in the lateral direction to the dimension of the non-sealed portion in the longitudinal direction is 0.20 or more and 0, including the portion where the inner surfaces of the packaging material are in contact with each other. A bag that is .50 or less.

In a bag according to another aspect of the present invention, when the packaging material contains an adhesive layer, the bag is provided with a portion of the bag fixed to the second end side of the easy-opening line. The bending strength, which is the force required to bend the bag when the portion 1 cm away from the easy-opening wire to the first end side is pressed from the front surface side to the back surface side, is preferably 25 N or more. be.

In a bag according to another aspect of the present invention, when the packaging material does not contain an adhesive layer, the bag is in a state where the portion of the bag located on the second end side of the easy-opening line is fixed. Of these, the bending strength, which is the force required to bend the bag when the portion 1 cm away from the easy-opening wire to the first end side is pressed from the front surface side to the back surface side, is preferably 15 N or more. Is.

A bag according to another aspect of the present invention may further include a gasp portion extending from the first end portion to the second end portion along the longitudinal direction and on the back surface side on which the packaging material is overlapped. ..

In a bag according to another aspect of the present invention, the contents may contain a plurality of granules.

In the 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.

In a bag according to another aspect of the present invention, the easy-opening line may include a portion extending along the lateral direction and having a wavy shape.

In a bag according to another aspect of the present invention, the easy-opening line is located on the front surface, is connected to a center line extending along the lateral direction, and is connected to one end of the center line and reaches the back surface. It has a first side line extending and a second side line connected to the other end of the center line and extending so as to reach the back surface, and the first side line is the first side line rather than the center line. The second side line including a first side line on the first end side located on the end side and a first side line on the second end side located on the second end side of the center line. Is a first end side second side line located closer to the first end side than the center line, and a second end side second side line located closer to the second end side than the center line. And may be included.

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the following Examples as long as the gist of the present invention is not exceeded.

(Example 1)
The layer structure shown in the third example above, that is,
ONy (15) / Printing layer (1) / Adhesive layer (3) / Uniaxially stretched HDPE (18) / Adhesive layer (3) / PE (40)
The packaging material 30 having the above-mentioned layer structure was prepared. The non-through hole 201 was formed in Ny (15) / printed layer (1). Subsequently, the bag 10 shown in FIG. 1 was manufactured using the packaging material 30. The dimension L1 of the unsealed portion 18 of the bag 10 in the longitudinal direction D1 was 120 mm, and the dimension L2 of the unsealed portion 18 in the lateral direction D2 was 25 mm. The contents of the bag 10 were granular instant coffee. Further, before sealing the bag 10, the inside of the bag 10 was degassed.

Subsequently, the bending strength of the bag 10 was measured in the compression test mode using a tensile tester (Tensilon). Specifically, first, as shown in FIG. 12A, the bag 10 is supported by the bag 10 so that the back surface 12 of the portion of the bag 10 located on the second end 14 side of the easy-opening line 20 is in contact with the support base 52. It was placed on 52. Subsequently, as shown in FIG. 12A, of the bag 10, the portion of the bag 10 located on the second end 14 side of the easy-opening wire 20 is fixed to the support base 52 so as not to be displaced. A portion separated by a distance T from the easy-opening wire 20 to the first end 13 side was pressed from the front surface 11 side to the back surface 12 side by a force F3 using a jig 51. As the jig 51, a metal jig provided in a tensile tester (Tensilon) was used. The distance T was 1 cm.

The force F3 for the jig 51 to press the bag 10 was increased until the bag 10 was bent. As a result, when the force F3 is 26.7N, as shown in FIG. 12B, the easy-opening wire 20 is broken and the bag 10 is bent, and the jig 51 is pulled out to the first end 13 side of the bent bag 10. went. The force F3, that is, 26.7N when the bag 10 was bent and the jig 51 was pulled out toward the first end portion 13, was recorded as the bending strength of the bag 10.

(Example 2)
The bag 10 was prepared using the packaging material 30 in the same manner as in Example 1 except that the sprinkle was used as the content. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 30.8N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end portion 13 side.

(Example 3)
The packaging material is the same as in Example 2 except that the dimension L1 in the longitudinal direction D1 of the unsealed portion 18 of the bag 10 is 130 mm and the dimension L2 in the lateral direction D2 of the unsealed portion 18 is 30 mm. The bag 10 was made using 30. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 34.0N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Example 4)
A bag 10 was prepared using the packaging material 30 in the same manner as in Example 1 except that millet was used as the content. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 26.5N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Example 5)
A bag 10 was prepared using the packaging material 30 in the same manner as in Example 1 except that the powder detergent was used as the content. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 28.6N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Comparative Example 1)
The packaging material 30 was used in the same manner as in Example 1 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 9.8 N, the bag 10 was bent without breaking the easy-open wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 2)
The packaging material 30 was used in the same manner as in Example 2 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 14.7N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 3)
The packaging material 30 was used in the same manner as in Example 3 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 24.3N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 4)
The packaging material 30 was used in the same manner as in Example 4 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 14.6N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 5)
The packaging material 30 was used in the same manner as in Example 5 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 21.7N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

The evaluation results in Examples 1 to 5 and Comparative Examples 1 to 5 are summarized in FIG. 13. In the bag 10 in which the internal degassing was carried out according to Examples 1 to 5, the bending strength was 26 N or more. Further, when a force F3 of 26 N or more was applied to the bag 10, the easy-opening line 20 broke before the contents of the bag 10 were bent, so that the bag 10 could be opened. In Examples 1 to 5, it is considered that the bending of the bag 10 was caused by the breakage of the easy-opening wire 20 to eliminate the internal degassing state and the rigidity of the contents to be reduced.

On the other hand, in the bag 10 in which the inside is filled with gas according to Comparative Examples 1 to 5, the bending strength was 25 N or less. Specifically, the contents and the bag 10 were bent before the easy-opening wire 20 was broken. Therefore, the bag 10 could not be opened.

(Example 6)
The layer structure shown in the fifth example above, that is,
PET (12) / Print layer (1) / Anchor coat layer (0.1) / PE (13) / Aluminum foil (6) / Anchor coat layer (0.1) / PE (13) / PE (30)
A bag 10 was produced using the packaging material 30 in the same manner as in the case of Example 1, except that the packaging material 30 having the above-mentioned layer structure was used. The non-through hole 201 was formed in the PET (12) / printed layer (1). Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 16.0 N, the easy-open wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Example 7)
The bag 10 was prepared using the packaging material 30 in the same manner as in Example 6 except that the sprinkle was used as the content. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 16.3N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Example 8)
The packaging material is the same as in the case of Example 7, except that the dimension L1 in the longitudinal direction D1 of the unsealed portion 18 of the bag 10 is 130 mm and the dimension L2 in the lateral direction D2 of the unsealed portion 18 is 30 mm. The bag 10 was made using 30. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 20.9N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end portion 13 side.

(Example 9)
A bag 10 was prepared using the packaging material 30 in the same manner as in Example 6 except that millet was used as the content. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 25.8N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Example 10)
A bag 10 was prepared using the packaging material 30 in the same manner as in Example 6 except that the powder detergent was used as the content. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 27.0 N, the easy-opening wire 20 broke, the bag 10 bent, and the jig 51 slipped out to the first end 13 side.

(Comparative Example 6)
The packaging material 30 was used in the same manner as in Example 6 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 11.6N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 7)
The packaging material 30 was used in the same manner as in Example 7 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 14.4N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 8)
The packaging material 30 was used in the same manner as in Example 8 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 12.1N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 9)
The packaging material 30 was used in the same manner as in Example 9 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 8.3N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

(Comparative Example 10)
The packaging material 30 was used in the same manner as in Example 10 except that the inside of the bag 10 was filled with gas instead of degassing the inside of the bag 10 before sealing the bag 10. The bag 10 was made. Subsequently, the bending strength of the bag 10 was measured. As a result, when the force F3 was 10.9N, the bag 10 was bent without breaking the easy-opening wire 20, and the jig 51 was pulled out to the first end portion 13 side.

The evaluation results in Examples 6 to 10 and Comparative Examples 6 to 10 are summarized in FIG. In the bag 10 in which the internal degassing 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 easy-opening line 20 broke before the contents of the bag 10 were bent, and the bag 10 could be opened. In Examples 6 to 10, it is considered that the bending of the bag 10 was caused by the breakage of the easy-opening wire 20 to eliminate the degassed state inside and to reduce the rigidity of the contents.

On the other hand, in the bag 10 in which the inside is filled with gas according to Comparative Examples 6 to 10, the bending strength was 15 N or less. Specifically, the contents and the bag 10 were bent before the easy-opening wire 20 was broken. Therefore, the bag 10 could not be opened.

10 Bag 11 Front surface 12 Back surface 13 1st end 131 1st end seal 14 2nd end 141 2nd end seal 15 3rd end 16 4th end 17 Gassho 171 Gassho seal 172 Tip Part 173 Base 18 Non-seal part 181 First non-seal part 182 Second non-seal part 19 Contents 191 Granules 20 Easy-open line 201 Non-through hole 21 Center line 211 One end 212 One end 22 First side line 221 First end Part side 1st side line 222 2nd end side 1st side line 23 2nd side line 231 1st end side 2nd side line 232 2nd end side 2nd side line 24 Suppression line 241 1st end side Suppression line 242 Second end side restraint line 30 Packaging material 31 Base material layer 32 Sealant layer 33 Adhesive layer 41 Index finger 42 Thumb

Claims (11)

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 first and second ends, which extend in the lateral direction and face each other in the longitudinal direction,
With the third and fourth ends extending from the first end to the second end along the longitudinal direction and facing each other in the lateral direction.
A first-end seal portion and a second-end seal portion that extend along the first end portion and the second end portion and join the inner surfaces of the packaging materials to each other.
A non-seal portion located between the first end seal portion and the second end seal portion and to which the inner surfaces of the packaging materials are not joined to each other.
The non-seal portion includes an easy-opening wire including a non-through hole formed on the outer surface side of the packaging material.
The easy-opening line is configured to cross the front surface in the lateral direction and reach the back surface side.
The easy-open line is located at the center of the unsealed portion in the longitudinal direction.
The central portion is within 0.1 × L1 from the center of the non-sealed portion in the longitudinal direction to the first end portion side and the second end portion side, and L1 is the said in the longitudinal direction. A bag, which is the size of the unsealed part. The non-seal portion is located adjacent to either the first end seal portion or the second end seal portion, and includes a portion in which the inner surfaces of the packaging materials are in contact with each other. The bag described in. The bag according to claim 1 or 2, wherein the ratio of the dimension of the non-sealed portion in the lateral direction to the dimension of the non-sealed portion in the longitudinal direction is 0.20 or more and 0.50 or less. The easy-open line is
A center line located at least on the surface and extending along the lateral direction,
The bag according to any one of claims 1 to 3, which is located on the back surface side and has a deterrent line extending in a direction different from the direction in which the center line extends. 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 first and second ends, which extend in the lateral direction and face each other in the longitudinal direction,
With the third and fourth ends extending from the first end to the second end along the longitudinal direction and facing each other in the lateral direction.
A first-end seal portion and a second-end seal portion that extend along the first end portion and the second end portion and join the inner surfaces of the packaging materials to each other.
A non-seal portion located between the first end seal portion and the second end seal portion and to which the inner surfaces of the packaging materials are not joined to each other.
The non-seal portion includes a non-through hole formed on the outer surface side of the packaging material, and at least partially includes an easy-opening wire extending in the lateral direction.
The non-seal portion includes a portion located adjacent to either the first end seal portion or the second end seal portion and in which the inner surfaces of the packaging materials are in contact with each other.
The ratio of the dimension of the non-sealed portion in the lateral direction to the dimension of the non-sealed portion in the longitudinal direction is 0.20 or more and 0.50 or less.
The easy-open line is located at the center of the unsealed portion in the longitudinal direction.
The central portion is within 0.1 × L1 from the center of the non-sealed portion in the longitudinal direction to the first end portion side and the second end portion side, and L1 is the said in the longitudinal direction. A bag, which is the size of the unsealed part. When the packaging material contains an adhesive layer, the first end of the bag from the easy-open line is fixed in a state where the portion of the bag located closer to the second end side of the easy-open line is fixed. One of claims 1 to 5, wherein the bending proof stress, which is the force required to bend the bag when the portion 1 cm away from the portion side is pressed from the front surface side to the back surface side, is 25 N or more. The bag described in. When the packaging material does not contain an adhesive layer, the first part of the bag from the easy-opening line is fixed in a state where the portion of the bag located closer to the second end portion of the easy-opening line is fixed. Any one of claims 1 to 5, wherein the bending proof stress, which is the force required to bend the bag when the portion 1 cm away from the end side is pressed from the front surface side to the back surface side, is 15 N or more. The bag described in the section. The invention according to any one of claims 1 to 7, further comprising a gasp portion extending from the first end portion to the second end portion along the longitudinal direction and on which the packaging material is overlapped on the back surface side. bag. The bag according to any one of claims 1 to 8, wherein the contents include a plurality of granules. The bag according to any one of claims 1 to 9, wherein the dimension of the non-sealed portion in the longitudinal direction is 40 mm or more and 200 mm or less. The bag according to any one of claims 1 to 10, wherein the easy-opening line extends along the lateral direction and includes a portion having a wavy shape.

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