JP2022087316A - Easy open package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package which enables tearing along an opening introduction line when torn at a predetermined part of a laminated film which has open-easiness by scarification on its base material layer.

SOLUTION: A package is made of two sheets of laminated film 11, laminated with more than two layers as at least a base material film layer and a heat-sealable sealant layer overlapped together. The sealant layer of both laminated films 11, arranged to face with each other, are overlapped, and the sheets are sealed together at its peripheral parts to form a pouch-like package. Only on the base material film layer, an opening introduction line 14 is arranged by scarification, and the scarification is processed at least on a surface of the base material film layer on a side closer to the sealant layer.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to an easily openable package.

Packaging bags using various plastic films are often used for packaging foods, pharmaceuticals, and miscellaneous goods, and two or more layers of biaxially stretched plastic films and heat-sealable non-oriented plastics are laminated. Packaging bags are widely used. The biaxially stretched film has excellent durability, moisture resistance, mechanical strength, heat resistance, and oil resistance, and was manufactured by using a tubular method, a flat simultaneous biaxial stretching method, a flat sequential biaxial stretching method, and the like. Biaxially stretched films are widely used in the food packaging field and the like.

However, the packaging bag using the biaxially stretched film has a problem that the tear-opening property is poor. There is a method of adding a notch to improve the openability, but when tearing from the notch, the phenomenon that it does not tear linearly often occurs, so this problem is solved and the handling when taking out the contents is improved. In order to make it possible, some measures have been taken to form an appropriate opening at the same time as the opening operation.

Specifically, there is a method in which a means for facilitating opening or tearing is provided in a part of the package and the package is opened along the means. As the opening assisting means, for example, a method of fixing a plastic thread or a cut tape to the inside of the sealant film in the process of bag making, a method of utilizing the orientation of the uniaxially stretched film, or providing porous micropores on the entire surface of the base material. Things are known.

In addition, various methods have been proposed for forming continuous or intermittent weakening lines or half-cut lines for inducing opening by pressing a blade against a part of the biaxially stretched film or irradiating it with carbon dioxide laser light. There is. For example, Patent Document 1 discloses a technique of providing a half-cut wire in a laminated layer by irradiating a laser from the sealant layer side of a laminated film.

Japanese Unexamined Patent Publication No. 2016-043946

As described in the same document, a carbon dioxide laser apparatus is generally used for carrying out the technique described in Patent Document 1. However, the formation of the half-cut line by this method is performed by the film absorbing the laser beam, producing a thermally excited state, and causing local heat generation and evaporation of the film itself. Therefore, half-cut lines are not well formed on a base film such as polypropylene, which is difficult to absorb laser light and is difficult to transition to a thermally excited state. Further, if there is a metal foil, a vapor deposition, or a printing layer that reflects the laser beam, this method cannot be applied. As described above, the adoption of the technique shown in Patent Document 1 includes a problem with great restrictions on the composition of the laminated material.

The present invention has been made in view of the above circumstances, and in a laminated body to which easy-opening property has been imparted by scratch processing on the base film layer, when tearing is performed from a predetermined position, the opening guide wire is formed. An object of the present invention is to provide a package that can be torn along. Another object of the present invention is to provide a package having excellent impact resistance such as dropping.

The above problems can be solved by the following invention.
That is, the first invention is composed of a laminate composed of two or more layers in which at least a base film layer and a heat-sealable sealant layer are laminated, and the sealant layers are arranged so as to face each other. It is a package formed in a pouch shape by sealing the peripheral portion of the body, and the opening guide wire by scratch processing is applied only to the base film layer, and the scratch processing is performed at least on the base film layer. It is an easy-to-open package, characterized in that it is formed on a surface close to the sealant layer.

In the second invention, an opening start means is provided on the peripheral portion of the easily openable package.
In the third invention, the base film layer includes a plastic film stretched at least in the uniaxial direction.
In the fourth invention, the base film layer includes a biaxially stretched film.
In the fifth invention, the biaxially stretched film is any one of a biaxially stretched polyester film, a biaxially stretched polyamide film, a biaxially stretched polypropylene film, and a material having a vapor deposition process or a coating process on the surface thereof. It is selected from more than one type.
In the sixth invention, the base film layer is a bonding of a plurality of stretched films.

According to the present invention, a package that can be torn along an opening guide line when it is torn from a predetermined position in a laminated body that has been easily opened by scratching the base film layer. Can be provided. Further, it is possible to provide a package having excellent impact resistance such as dropping.

It is a top view which shows an example of the easy-to-open package. It is a top view which shows an example of an opening guide line. (A) to (f) are sectional views illustrating the laminated body including the scratch processing.

Hereinafter, the present invention will be described with reference to the drawings based on the preferred embodiments.
FIG. 1 shows an example of an easily openable package. The easy-to-open package 10 of the present embodiment is a package formed in a pouch shape by sealing the peripheral edge portion of the laminated body 11. In the illustrated example, the seal portion 12 and the mouth portion 13 are formed on the peripheral edge portion of the easily openable package 10. By filling the inside surrounded by the sealing portion 12 with the contents and then closing the mouth portion 13, it is possible to obtain a package in which the contents are sealed.

The peripheral edge of the package may be closed before the contents are filled. In this case, the contents may be filled through an injection port (not shown) of a separately provided molded product or the like.
When the content is a solid material or the like, the content is placed between the laminates 11 in which the seal portion 12 is not formed, or between the laminates 11 in which the seal portion 12 is partially formed. After insertion, the peripheral edge portion of the laminated body 11 may be sealed.

In a package in which the contents are sealed, it is necessary to open the package in order to take out the contents. In the present embodiment, the opening guide line 14 is provided so as to cross the easily openable package 10. The opening guide wire 14 is configured to facilitate linear tearing by scratch processing along the flow direction Z of the laminated body 11. The scratch processing constituting the opening guide wire 14 may be continuous or intermittent between both ends. Both ends of the open guide wire 14 may reach the end of the easy-to-open package 10 or may be located slightly away from the end of the easy-to-open package 10. Both ends of the opening guide wire 14 may be provided on the seal portion 12. Since the opening guide wire 14 of the present embodiment is composed of a large number of scratches 21 as shown in FIG. 2, in FIG. 1, the region where the opening guide wire 14 is formed is shaded.

Further, an opening start means 15 is provided on the peripheral portion of the easily openable package 10. Examples of the opening starting means 15 include notches (cuts) formed in an I-shape, a V-shape, a U-shape, or the like. Further, a jagged cut having a large number of notches at the end, a magic cut (registered trademark) having a large number of holes at the end, and the like can be mentioned. The opening start means 15 is preferably provided in the vicinity of one end or both ends of the opening guide wire 14. The opening start means 15 may be provided on the sealing portion 12.

FIG. 2 shows an example of the opening guide wire. The opening guide line 14 in the illustrated example has a guide portion 20 as a set of two scratches 21 arranged line-symmetrically with respect to the flow direction Z as one unit, and the guide portion 20 is set along the flow direction Z. It is a configuration in which three rows are arranged. The number of rows composed of the guide portions 20 is not particularly limited, and may be one row or two or more rows. The two scratches 21 constituting each guide portion 20 are formed along the shaded portion 24 so that the spacing is wide on the side of the first end 22 and narrow on the side of the second end 23. .. The center line 25 of the opening guide line 14 is arranged parallel to the flow direction Z. The scratch processing 21 can be formed by machining, laser processing, or the like. The shaded area 24 is a virtual line indicating a center position where a cutting tool in machining, a laser beam in laser machining, or the like hits.

FIG. 3 shows various examples in which the laminated body 11 is provided with the scratch processing 21.
The laminate 11 has at least the sealant layer 31 on the innermost side of the easy-to-open package 10. In the seal portion 12 described above, the sealant layer 31 is heat-sealed with the laminated bodies 11 arranged so that the sealant layers 31 face each other. Examples of the sealant resin constituting the sealant layer 31 include polyolefin-based resins such as polyethylene-based resins, polypropylene-based resins, and cyclic olefin resins. The sealant resin may be a non-stretched resin.

The laminate 11 is composed of two or more layers in which at least a base film layer is laminated on the outside of the sealant layer 31. Examples of the layer other than the sealant layer 31 constituting the laminate 11 include a metal foil 32 such as an aluminum foil, an intermediate resin layer 33, an outermost resin layer 34, and the like. The metal foil 32 or the intermediate resin layer 33 can be omitted, respectively. Either the intermediate resin layer 33 or the outermost resin layer 34 is a base film layer. The base film layer is preferably made of a material different from the sealant layer in at least one or more of the composition or orientation state (presence or absence of stretching, etc.) of the resin. The base film layer is preferably composed of a material that is not heat-sealed under the condition that the sealant layer is heat-sealed.

The base film layer preferably contains a plastic film that has been stretched at least in the uniaxial direction, and more preferably contains a biaxially stretched film. The stretching direction may be one or more of a direction parallel to the flow direction Z, a direction perpendicular to the flow direction Z, and a direction inclined in the flow direction Z. In the biaxially stretched film, the two stretching directions may be perpendicular to each other or may not be perpendicular to each other.

Examples of the biaxially stretched film include any one or more of a biaxially stretched polyester film, a biaxially stretched polyamide film, a biaxially stretched polypropylene film, and a material having a vapor deposition process or a coating process on the surface thereof. Examples of the method of laminating the stretched resin layer on the laminated body 11 include a method of laminating the stretched resin film before laminating.

The base film layer may be a bonding of a plurality of stretched films. In this case, a material other than the stretched film may be laminated between the plurality of stretched films. Examples of the material other than the stretched film include a metal foil such as an aluminum foil, a non-stretched resin layer such as a non-stretched polyolefin resin, an adhesive layer, and an anchoring agent layer.

When the intermediate resin layer 33 is the base film layer, the outermost resin layer 34 may be a resin layer other than the base film layer. When the outermost resin layer 34 is the base film layer, the intermediate resin layer 33 may be a resin layer other than the base film layer. Examples of the resin layer other than the base film layer include non-stretched polyolefin-based resins. Examples of the method of laminating the non-stretched resin layer on the laminated body 11 include laminating a non-stretched resin film and extruded coating of a molten resin.

In the easily openable package 10 of the present embodiment, the opening guide line 14 by the scratch processing 21 is applied only to the base film layer, and the scratch processing 21 is at least on the side close to the sealant layer 31 of the base film layer. It is done on the face. This makes it possible to provide an easily openable package 10 that can be easily torn along the opening guide line 14. When the laminate 11 includes two or more base film layers, the "surface on the side closer to the sealant layer 31" is "the side of the base film layer closest to the sealant layer 31 on the side closer to the sealant layer 31". Means "face".

When the base film layer is composed of only a stretched film, only the stretched film is scratched. When the base film layer contains a material in which the surface of the stretched film is vapor-deposited or coated, scratches may be continuously applied to the stretched film and the vapor-deposited or coated. When the base film layer is a laminated film in which a material other than the stretched film is laminated between a plurality of stretched films, the stretched film and the material other than the stretched film are continuously scratched. May be good.

As shown in FIGS. 3A, 3C, and 3E, the scratch processing 21 may be formed from the side closer to the sealant layer 31 toward the side farther from the sealant layer 31. Further, as shown in FIGS. 3 (b), (d), and (f), the scratch processing 21 may be formed from the side far from the sealant layer 31 toward the side near the sealant layer 31. Here, the thickness (width) of the scratch processing 21 may be thinner or thicker on the end side of the scratch processing 21 than on the start side, or may be an even width.

The width of the scratch processing 21 may be zero (0) in at least a part of the film in the thickness direction. Here, the fact that the width of the scratch processing 21 is zero means that the materials on both sides of the scratch processing 21 in the width direction are separated but are in contact with each other. Further, the scratch processing 21 may be non-penetrating on the surface far from the sealant layer 31. Here, the non-penetrating scratch processing 21 means a state in which the material is not divided in a part of the film in the thickness direction. In addition, the fact that the scratch processing 21 penetrates means a state in which the material is divided over the entire thickness direction of the film.

As shown in FIGS. 3A and 3B, when the scratch processing 21 is formed only on the intermediate resin layer 33, the intermediate resin layer 33 is a base film layer and the outermost resin layer 34 is a base material. It may be a film layer or a layer other than the base film layer. As shown in FIGS. 3 (c) and 3 (d), when the scratch processing 21 is formed only on the outermost resin layer 34, the intermediate resin layer 33 is a layer other than the base film layer, and is the outermost resin layer. Reference numeral 34 is a base film layer. As shown in FIGS. 3 (e) and 3 (f), when the scratch processing 21 is formed on the intermediate resin layer 33 and the outermost resin layer 34, the intermediate resin layer 33 and the outermost resin layer 34 are the base film layers. Is.

When the intermediate resin layer 33 and the outermost resin layer 34 are base film layers, as shown in FIGS. 3A and 3B, the scratch processing 21 is formed only on the intermediate resin layer 33, or the scratch processing 21 is formed only on the intermediate resin layer 33. , As shown in FIGS. 3 (e) and 3 (f), the scratch processing 21 is formed on the intermediate resin layer 33 and the outermost resin layer 34. When the scratch processing 21 is formed only on the outermost resin layer 34 even though the intermediate resin layer 33 and the outermost resin layer 34 are the base film layers, it is the base film layer on the sealant layer 31 side. Since the scratch processing 21 is not formed on the intermediate resin layer 33, the tearing performance is deteriorated.

Further, in order to obtain a package having excellent impact resistance such as dropping, an intermediate resin layer 33 which is a base film layer or a stretched film having scratch processing 21 and a base film layer or stretching which does not have scratch processing 21 are obtained. It is preferable to superimpose the outermost resin layer 34 which is a film. As shown in FIGS. 3A and 3B, when the scratch processing 21 is formed only on the intermediate resin layer 33, a base film layer or a base film layer is formed between the intermediate resin layer 33 and the outermost resin layer 34. As a layer other than the stretched film, a metal foil such as an aluminum foil, a non-stretched resin layer such as a non-stretched polyolefin resin, an adhesive layer, an anchoring agent layer, or the like may be laminated.

When the base film layer is only the intermediate resin layer 33, the scratch processing 21 is formed only on the intermediate resin layer 33 as shown in FIGS. 3A and 3B. When the scratch processing 21 reaches the outermost resin layer 34 even though the outermost resin layer 34 is not the base film layer, the scratch processing 21 formed on the outermost resin layer 34 which is not the base film layer is intended. There is a risk that the laminated body 11 will be damaged due to the expansion.

When the base film layer is only the outermost resin layer 34, the scratch processing 21 is formed only on the outermost resin layer 34 as shown in FIGS. 3 (c) and 3 (d). When the scratch processing 21 reaches the intermediate resin layer 33 even though the intermediate resin layer 33 is not the base film layer, the scratch processing 21 formed on the intermediate resin layer 33 which is not the base film layer unintentionally expands. Therefore, the laminated body 11 may be damaged.

As a method of obtaining the laminate 11 having the scratch processing 21 only on the specific base film layer, the base film layer after the scratch processing 21 is subjected to the scratch processing 21 and then the base film layer subjected to the scratch processing 21 is used as another layer. A method of laminating can be mentioned. The bonding method is not particularly limited, and examples thereof include a dry laminating method and an extrusion laminating method.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

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

<Experiment 1>
The laminate and packaging bag used in Experiment 1 were prepared by the following procedure. The layer structure of the laminate and the material used are "biaxially stretched PET film 12 μm / adhesive / biaxially stretched polyamide film 15 μm / adhesive / aluminum foil 9 μm / adhesive / sealant 70 μm".
The materials specifically used are as follows.

Biaxially stretched PET (polyethylene terephthalate) film: "Toyobo Ester (registered trademark)" film manufactured by Toyobo Co., Ltd., single-sided corona treatment.
Biaxially stretched polyamide film: "Emblem (registered trademark)" manufactured by Unitika Ltd. ONBC, double-sided corona treatment.
Aluminum foil: Made by UACJ Co., Ltd., 1N30 general foil.
Sealant: "Trefan (registered trademark) NO" ZK100 manufactured by Toray Film Processing Co., Ltd., single-sided corona treatment.
Adhesive: "Takelac (registered trademark)" manufactured by Mitsui Chemicals, Inc., adhesive adhesion amount 3.5 g / m ² .

Both layers were laminated by the dry laminating method to obtain a laminated body. After the adhesive was cured, a three-sided bag having a width of 120 mm and a height of 180 mm was welded to the peripheral edge so as to have an outer peripheral seal width of 10 mm to prepare a packaging bag (pouch) as shown in FIG. The opening guide wire 14 was arranged at a position 20 mm from the mouth portion 13 in the height direction of the package. Notches were formed at both ends of the opening guide wire 14 as opening starting means 15. R5 mm corner cuts were made at the four corners.

The opening guide wire 14 formed perforations by through holes in the base film layer by pressing a die-cut roll before the laminating process. The base film layer to which the perforations were added was one or two layers of a biaxially stretched PET film or a biaxially stretched polyamide (Ny) film. There are two pressing directions for the blade: the surface layer side (machining starts from the surface far from the sealant layer) and the inner layer side (machining starts from the surface closer to the sealant layer). The perforations penetrating the two layers of PET and Ny were added by the same method after laminating the two layers in advance.

The perforation pattern has a shape as shown in FIG. 2 endlessly developed in the flow direction Z of the film. In FIG. 2, the distance A on the side where the distance between the two scratches 21 is widened is 1.3 mm, and the distance B on the side where the distance between the two scratches 21 is narrow is 0.5 mm. The distance C between the portions 20 is 0.6 mm, the distance D along the flow direction Z at both ends of the scratch processing 21 is 1.0 mm, the distance E between the guide portions 20 adjacent to the flow direction Z is 0.2 mm, and the distance Z is in the flow direction Z. The repeating pitch F of the adjacent guide portions 20 is 1.2 mm. It should be noted that these dimensions A to F are set according to the position of the shaded portion 24 at the center without depending on the thickness of the scratch processing 21.

The obtained various packaging bags were filled with 200 mL of water, and the mouth portion 13 was heat-sealed with an impulse sealer to close the mouth portion 13. After that, a hot water retort sterilization treatment was performed at 128 ° C. for 30 minutes, and this water-filled pouch was used as an evaluation sample.

<Evaluation of tearability>
When 10 subjects manually opened 10 bags each from the notch of the pouch in the direction along the opening guide line, the one that reached the other seal part without deviating from the guide line was marked with "○". Those that deviated from or were caught in the above were judged as "x", and the ratio of the number of samples judged as "○" was counted. For the specimens without the opening and sealing lead wire, those in which the broken line deviated by 10 mm or more from the straight line connecting the notches at both ends were judged as "x".

<Drop test>
After allowing the sample pouch to stand in an environment of 5 ° C. for 12 hours, the sample pouch was freely dropped onto the concrete surface with the abdomen of the pouch facing down from a height of 180 cm in a cold state. The number of drops for the same sample was 5 times in a row. If the fracture (cracking) occurred before the number of drops reached 5, the drop test of the sample was stopped after the number of drops. The scores shown in Table 1 were given to each sample according to the number of drops in which destruction occurred. The total score of a total of 100 samples was calculated, and the superiority and inferiority of the relative impact resistance was compared.

<Experimental results>
Table 2 shows the evaluation results of the tearability in Experiment 1 and the results of the drop test. No. The pouch without the opening guide line represented by 1-7 had the required impact resistance, but the tear line deviated greatly and most of them could not achieve a straight tear.
No. The specimens represented by 1-1 and 1-2, in which the guide wire was added to the intermediate Ny layer, achieved a linear cut at the time of tearing and opening, and also performed well in the drop test.
No. The specimens represented by 1-3 and 1-4 in which the guide wire is attached to the outermost PET layer have sufficient impact resistance, but the straight cut performance is provided despite the opening guide wire. It became clear that it was not possible to demonstrate.
No. In the case of applying the guide wire to the two layers of the biaxially stretched film represented by 1-5 and 1-6, although the linear cut property is good, the guide wire is broken due to the impact at the time of dropping, and the film falls. The test scores were shown to drop significantly.
The results of Experiment 1 show that the scratch processing of the opening guide wire is performed on the stretched film closest to the sealant, which is a necessary condition for imparting the performance at the time of tearing and opening. However, in the case of heavy-duty packaging, it has been suggested that the required impact resistance may not be obtained if all layers of the stretched base film layer are scratched, and the inner stretched base film is used. It has been shown that the problem can be solved by achieving both tearing performance and impact resistance by applying scratch processing only to the layer.

<Experiment 2>
The laminate and packaging bag used in Experiment 2 were prepared by the following procedure. The layer structure of the laminate and the material used are "biaxially stretched PET film 12 μm / anchor agent / low density polyethylene 15 μm / aluminum foil 9 μm / anchor agent / low density polyethylene 40 μm".
The materials specifically used are as follows.

Biaxially stretched PET film: "Toyobo Ester (registered trademark)" film manufactured by Toyobo Co., Ltd., single-sided corona treatment.
Aluminum foil: Made by UACJ Co., Ltd., 1N30 general foil.
Low-density polyethylene: "Sumikasen (registered trademark)" L705 manufactured by Sumitomo Chemical Co., Ltd.
Anchor: Made by Toyo Morton Co., Ltd., adhesive for extrusion laminating EL-540 / CAT-RT32, adhesion amount 2 g / m ² .

Low-density polyethylene was laminated between the biaxially stretched PET film and the aluminum foil by an extrusion laminating method to obtain a laminated body. The preparation of the three-way bag and the formation of the opening guide line were the same as in Experiment 1. However, in Experiment 2, the base film layer with the perforations was only the biaxially stretched PET film, but the case where the scratch processing penetrated the film and the case where the scratch processing penetrated the film were made separately. In the case of non-penetration, the pressing pressure of the blade during the easy opening process was intentionally reduced.

<Evaluation of tearability>
It was carried out according to the same evaluation method as in Experiment 1.

<Drop test>
Unlike Experiment 1, the contents contained in the pouch were filled with 50 mL of water, and then the mouth was sealed and closed. Hot water retort sterilization treatment and storage in a cold state were not performed, and free fall was continuously performed 5 times from a height of 180 cm at room temperature. The visual leakage determination and scoring were carried out by the same method as in Experiment 1.

<Experimental results>
Table 3 shows the evaluation results of the tearability in Experiment 2 and the results of the drop test. Since the weight of the contained material was reduced, no specimen was destroyed by dropping, but there was a certain tendency in the linear cut property during the tearing operation.
No. where the scratch processing penetrates the base film layer. 2-1 and 2-2 showed good linear cutability. No. 1 where the scratch processing did not penetrate the base film layer and the blade was applied from near the sealant surface. Similarly, it was clarified that the linear cut property of 2-4 can be obtained in all the samples. On the other hand, No. 1 which was easily opened from the surface layer side. No. 2-3 has no guide wire. It was shown that the tearing performance was not significantly different from 2-5, and that the sealant surface of the base film layer was scratched, which contributed to the development of the opening performance.

10 ... Easy-to-open package, 11 ... Laminated body, 12 ... Seal part, 13 ... Mouth part, 14 ... Opening guide wire, 15 ... Opening start means, 20 ... Guide part, 21 ... Scratch processing, 22 ... First end , 23 ... 2nd end, 24 ... shaded portion, 25 ... center line, 31 ... sealant layer, 32 ... metal leaf, 33 ... intermediate resin layer, 34 ... outermost resin layer.

The above problems can be solved by the following invention.
That is, the first invention is composed of a laminate composed of two or more layers in which at least a base film layer and a heat-sealable sealant layer are laminated, and the sealant layers are arranged so as to face each other. It is a package formed in a pouch shape by sealing the peripheral portion of the body, and the opening guide wire by scratch processing is applied only to the base film layer, and the scratch processing is performed at least on the base film layer. It is an easy-to-open package characterized by being die -cut on the surface close to the sealant layer.

Claims (6)

It is composed of a laminate consisting of at least two or more layers in which a base film layer and a heat-sealable sealant layer are laminated, and seals the peripheral edge portion of the laminate in which the sealant layers are arranged so as to face each other. It is a package formed in the shape of a pouch.
Only the base film layer is provided with an opening guide line by scratch processing, and the scratch processing is performed on the surface of the base film layer on the side close to the sealant layer, which is easy to open. Sex packaging. The easy-to-open package according to claim 1, wherein a means for starting opening is provided on the peripheral portion of the easy-to-open package. The easy-to-open package according to claim 1 or 2, wherein the base film layer contains a plastic film that has been stretched at least in the uniaxial direction. The easily openable package according to any one of claims 1 to 3, wherein the base film layer contains a biaxially stretched film. The biaxially stretched film was selected from one or more of a biaxially stretched polyester film, a biaxially stretched polyamide film, a biaxially stretched polypropylene film, and a material having a vapor deposition process or a coating process on the surface thereof. The easy-to-open package according to claim 4, wherein the package is characterized by the above. The easily openable package according to any one of claims 1 to 5, wherein the base film layer is a bonding of a plurality of stretched films.

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