JP2019131198A - Easy open package - Google Patents

Abstract

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

Description

  The present invention relates to an easily openable package.

  Many packaging bags using various plastic films are used for packaging foods, pharmaceuticals, and miscellaneous goods. Two or three 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 is manufactured using a tubular method, a flat simultaneous biaxial stretching method, a flat sequential biaxial stretching method, etc. Biaxially stretched films are widely used in the food packaging field.

  However, a packaging bag using a biaxially stretched film has a problem that tear tearability is poor. There is a method to give a notch to improve the openability, but when tearing from the notch, a phenomenon that does not tear linearly often occurs, so this problem is solved and handling when taking out the contents is improved In order to make it open, the device which forms an appropriate opening part simultaneously with opening operation is also performed.

  Specifically, there is a method in which means for facilitating opening and tearing is provided in a part of the package, and the package is opened along that means. As opening assistance means, for example, a method of fixing a plastic thread or a cut tape inside a sealant film during a bag making process, a method using the orientation of a uniaxially stretched film, or porous fine holes on the entire surface of a substrate Things are known.

  In addition, various methods of forming continuous or intermittent weakening lines and half-cut lines for inducing opening by pressing a blade or irradiating carbon dioxide laser light on a part of a biaxially stretched film have been proposed. Yes. For example, Patent Document 1 discloses a technique for providing a half-cut line in a laminate layer by performing laser irradiation from the sealant layer side of the laminated film.

JP, 2006-043946, A

  As described in the document, a carbon dioxide laser device is generally used to implement the technique described in Patent Document 1. However, the half-cut line is formed by this construction method because the film absorbs the laser light, generates a thermally excited state, and local heat generation and transpiration of the film itself occurs. Therefore, a half-cut line is not well formed on a base film such as polypropylene that hardly absorbs laser light and hardly transitions to a thermally excited state. In addition, this method cannot be applied if there is a metal foil, vapor deposition, or printed layer that reflects laser light. As described above, the adoption of the technique disclosed in Patent Document 1 includes a problem with a large restriction on the configuration of the laminate material.

  The present invention has been made in view of the above circumstances, and in a laminate provided with easy-openability by scratch processing on a base film layer, when tearing from a predetermined position, the opening guide wire It is an object of the present invention to provide a package that can be torn along. It is another object of the present invention to provide a package having excellent impact resistance such as dropping.

The above problems can be solved by the following present 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 overlapped, and the laminate in which the sealant layers are arranged to face each other. A package formed in a pouch shape by sealing a peripheral edge of the body, wherein only the base film layer is provided with an opening guide line by scratch processing, and the scratch processing is at least of the base film layer. An easy-open packaging body characterized in that it is formed on a surface close to the sealant layer.

In 2nd invention, the opening start means is provided to the peripheral part of the said easily openable package.
In the third invention, the base film layer includes a plastic film stretched in at least a uniaxial direction.
In 4th invention, the said base film layer contains the 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 whose surface is vapor-deposited or coated. Selected from more than types.
In the sixth invention, the base film layer is a laminate of a plurality of stretched films.

  According to the present invention, in a laminate provided with easy-openability by scratching the base film layer, a package capable of tearing along the opening guide line when tearing from a predetermined position. Can be provided. Moreover, the package excellent in impact resistance, such as dropping, can be provided.

It is a top view which shows an example of an easily openable package. It is a top view which shows an example of an opening guide line. (A)-(f) is sectional drawing which illustrates the laminated body containing flaw processing.

Hereinafter, based on a preferred embodiment, the present invention will be described with reference to the drawings.
In FIG. 1, an example of an easily openable package is shown. The easy-open packaging body 10 of this embodiment is a packaging body formed in a pouch shape by sealing the peripheral edge of the laminate 11. In the illustrated example, a seal portion 12 and a mouth portion 13 are formed at the peripheral edge portion of the easy-open packaging body 10. After filling the contents surrounded by the seal part 12, the package 13 in which the contents are sealed can be obtained by closing the mouth part 13.

In addition, the peripheral part of the package may be closed before filling the contents. In this case, the contents may be filled through an injection port (not shown) such as a molded product provided separately.
Further, when the content is a solid or the like, the content is placed between the laminates 11 where the seal portion 12 is not formed or between the laminates 11 where the seal portion 12 is only partially formed. You may seal the peripheral part of the laminated body 11 after inserting.

  In a package in which the contents are sealed, opening is necessary in order to take out the contents. In this embodiment, the opening guide line 14 is given so that the easy-open packaging body 10 may be crossed. The unsealing guide wire 14 is configured such that a linear tearing is facilitated by scratching along the flow direction Z of the laminate 11. The flaw processing that constitutes the opening guide wire 14 may be continuous between both ends or may be intermittent. Both ends of the opening guide line 14 may reach the end of the easy-open packaging body 10, or may be positioned slightly away from the end of the easy-open packaging body 10. Both ends of the opening guide wire 14 may be provided on the seal portion 12. In addition, since the opening guide line 14 of this embodiment is comprised from many flaw processes 21 like FIG. 2, in FIG. 1, the area | region in which the opening guide line 14 is formed is represented by shading.

  Further, an opening start means 15 is provided on the peripheral edge of the easy-open packaging body 10. Examples of the opening start means 15 include notches (cuts) formed in an I shape, a V shape, a U shape, or the like. Further, there may be mentioned a knurled cut provided with a large number of notches at the end, a magic cut (registered trademark) provided with a large number of holes at the end. 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 in the seal portion 12.

  FIG. 2 shows an example of the opening guide line. The opening guide line 14 in the illustrated example has a guide unit 20 as a unit of two flaws 21 arranged symmetrically with respect to the flow direction Z, and the guide unit 20 along the flow direction Z. The configuration is arranged in three rows. The number of columns configured from the guide unit 20 is not particularly limited, and may be one column or two or more columns. The two flaws 21 constituting each guide portion 20 are formed along the shaded portion 24 so that the interval is wide on the first end 22 side and the interval is narrow on the second end 23 side. . The center line 25 of the opening guide line 14 is arranged in parallel with the flow direction Z. The flaw processing 21 can be formed by machining, laser processing, or the like. The hatched portion 24 is an imaginary line that indicates the center position where a blade in machining or a laser beam in laser machining or the like hits.

In FIG. 3, the various examples which provided the damage process 21 in the laminated body 11 are shown.
The laminate 11 has a sealant layer 31 at least on the innermost side of the easy-open packaging body 10. In the sealing part 12 described above, the sealant layer 31 is heat-sealed in a state where the laminate 11 is disposed so that the sealant layers 31 face each other. Examples of the sealant resin that constitutes the sealant layer 31 include polyolefin resins such as polyethylene resins, polypropylene resins, and cyclic olefin resins. The sealant resin may be an unstretched resin.

  The laminate 11 is composed of two or more layers in which at least a base film layer is superposed on the outside of the sealant layer 31. Examples of layers 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. Either the intermediate resin layer 33 or the outermost resin layer 34 is a base film layer. The base film layer is preferably composed of a material that is different from the sealant layer in at least one of the resin composition and the orientation state (existence of stretching, etc.). The base film layer is preferably made of a material that is not heat-sealed under the condition that the sealant layer is heat-sealed.

  The base film layer preferably includes a plastic film stretched in at least a uniaxial direction, and more preferably includes a biaxially stretched film. Examples of the stretching direction include 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 non-perpendicular.

  Examples of the biaxially stretched film include one or more of a biaxially stretched polyester film, a biaxially stretched polyamide film, a biaxially stretched polypropylene film, and a material that has been subjected to vapor deposition or coating on the surface thereof. Examples of the method of laminating the stretched resin layer on the laminate 11 include a method of laminating a stretched resin film before lamination.

  The base film layer may be a laminate of a plurality of stretched films. In this case, materials other than the stretched film may be laminated between the plurality of stretched films. Examples of materials other than the stretched film include metal foils such as aluminum foil, unstretched resin layers such as unstretched polyolefin-based resins, adhesive layers, and anchor agent layers.

  When the intermediate resin layer 33 is a 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 a 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 unstretched polyolefin resin. Examples of the method of laminating an unstretched resin layer on the laminate 11 include laminating an unstretched resin film, extrusion coating of a molten resin, and the like.

  In the easy-open packaging body 10 of the present embodiment, only the base film layer is provided with the opening guide line 14 by the scratch processing 21, and the scratch processing 21 is at least near the sealant layer 31 of the base film layer. Is made on the surface. Thereby, the easy-open packaging body 10 which can be easily torn along the opening guide line 14 can be provided. In addition, when the laminated body 11 includes two or more base film layers, “the surface on the side close to the sealant layer 31” means “the base film layer closest to the sealant layer 31 on the side close to the sealant layer 31”. Means "face".

  When a base film layer consists only of a stretched film, a scratch process is given only to a stretched film. When the base film layer includes a material that has been subjected to vapor deposition or coating on the surface of the stretched film, scratch processing may be performed continuously on the stretched film and vapor deposition or coating. When the base film layer is a laminate 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. Also good.

  As shown in FIGS. 3A, 3 </ b> C, and 3 </ b> E, the flaw processing 21 may be formed from the side closer to the sealant layer 31 toward the side farther from the side. Further, as shown in FIGS. 3B, 3 </ b> D, and 3 </ b> F, the flaw processing 21 may be formed from the side farther from the sealant layer 31 toward the side closer thereto. Here, the thickness (width) of the flaw processing 21 may be thinner or thicker at the end side of the flaw processing 21 than the start side, or may be an equal width.

  The width of the flaw processing 21 may be zero (0) in at least part of the thickness direction of the film. Here, the width of the flaw processing 21 being zero means that the materials on both sides in the width direction of the flaw processing 21 are divided but in contact with each other. Further, the flaw processing 21 may be non-penetrating on the surface far from the sealant layer 31. Here, the non-penetration of the flaw processing 21 means a state where the material is not divided in a part in the thickness direction of the film. In addition, that the flaw process 21 has penetrated means the state by which the material is parted over the whole thickness direction of a film.

  As shown in FIGS. 3A and 3B, when the flaw 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. 3C and 3D, when the flaw 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 the outermost resin layer Reference numeral 34 denotes a base film layer. As shown in FIGS. 3E and 3F, when the flaw 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 base film layers. It 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 flaw processing 21 is formed only on the intermediate resin layer 33, or As shown in FIGS. 3 (e) and 3 (f), the flaw processing 21 is formed in the intermediate resin layer 33 and the outermost resin layer 34. In the case where the flaw 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 base film layers, they are base film layers on the sealant layer 31 side. Since the flaw processing 21 is not formed on the intermediate resin layer 33, the tearing performance is lowered.

  In addition, 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 stretched film having a scratch 21 and a base film layer or stretch having no scratch 21 It is preferable to overlap the outermost resin layer 34 which is a film. As shown in FIGS. 3A and 3B, when the flaw processing 21 is formed only in the intermediate resin layer 33, the base film layer or the intermediate film layer 33 is interposed 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, an unstretched resin layer such as an unstretched polyolefin resin, an adhesive layer, an anchor agent layer, and the like may be laminated.

  When the base film layer is only the intermediate resin layer 33, the flaw processing 21 is formed only on the intermediate resin layer 33 as shown in FIGS. 3 (a) and 3 (b). Even when the outermost resin layer 34 is not a base film layer, the scratch processing 21 formed on the outermost resin layer 34 that is not a base film layer is intended when the scratch processing 21 reaches the outermost resin layer 34. There is a possibility that the laminate 11 may be damaged due to expansion.

  When the base film layer is only the outermost resin layer 34, the flaw 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 that is not the base film layer unintentionally expands. Thus, the laminate 11 may be damaged.

  As a method of obtaining the laminate 11 having the scratched process 21 only on a specific base film layer, the base film layer subjected to the scratch process 21 is applied to another layer after the scratched process 21 is applied to the base film layer. The method of laminating is mentioned. The method of bonding is not particularly limited, and examples thereof include a dry laminating method and an extrusion laminating method.

  As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

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

<Experiment 1>
The laminate and the packaging bag used in Experiment 1 were produced 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”.
Specific materials 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)” ONBC manufactured by Unitika Ltd., double-sided corona treatment.
Aluminum foil: made of UACJ Co., Ltd., 1N30 general foil.
Sealant: “Trephan (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 amount 3.5 g / m ² .

  All the layers were bonded together by a dry laminating method to obtain a laminate. 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, thereby producing a packaging bag (pouch) as shown in FIG. The opening guide wire 14 was disposed at a position 20 mm from the mouth portion 13 in the height direction of the package. At both ends of the opening guide wire 14, notches were formed as the opening start means 15. R4mm corner cuts were made at the four corners.

  The opening guide wire 14 formed a perforation by a through-hole in the base film layer by pressing a die-cut roll at the previous stage of the laminating process. The base film layer provided with perforations was one or two layers of a biaxially stretched PET film or a biaxially stretched polyamide (Ny) film. The pressing direction of the blade was set to two types, that is, the surface layer side (processing starts from the surface far from the sealant layer) and the inner layer side (processing starts from the surface close to the sealant layer). The perforation that penetrates the two layers of PET and Ny was applied by the same method after laminating the two layers in advance.

  The perforation pattern was developed endlessly in the film flow direction Z as shown in FIG. In FIG. 2, the distance A on the side where the distance between the two flaws 21 is increased is 1.3 mm, and the distance B on the side where the distance between the two flaws 21 is reduced 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 flaw 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 flow direction Z The repetition pitch F of the adjacent guiding portions 20 is 1.2 mm. These dimensions A to F are set by the position of the hatched portion 24 at the center without depending on the thickness of the flaw processing 21.

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

<Evaluation of tearability>
When 10 subjects manually opened 10 bags each from the notch part of the pouch in the direction along the opening guide line, “○” indicates that it reached the other seal part without departing from the guide line. Those that deviated or were caught were judged as “x”, and the ratio of the number of specimens judged as “◯” was counted. A specimen without an unsealed conducting wire was judged as “x” when a broken line deviated 10 mm or more from a straight line connecting notches at both ends.

<Drop test>
The sample pouch was allowed to stand in an environment of 5 ° C. for 12 hours, and then dropped freely 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 specimen was 5 consecutive times. When the breakage (cracking) occurred before the number of drops reached 5, the sample drop test was stopped at the number of drops. The score shown in Table 1 was given for each specimen according to the number of times the drop occurred. A total score of 100 samples was calculated, and the relative superiority and inferiority of impact strength were compared.

<Experimental result>
Table 2 shows the evaluation results of tearability and the results of the drop test in Experiment 1. No. Although the pouch without the opening guide line represented by 1-7 maintained the required impact resistance, the tear line deviated greatly, and most could not achieve linear tearing.
No. Samples represented by 1-1 and 1-2, in which a guide line was applied to the intermediate Ny layer, achieved a linear cut at the time of tearing and opening, and also showed good results in a drop test.
No. In the specimen represented by 1-3 and 1-4, the outermost PET layer provided with the guide wire has sufficient impact resistance, but the linear cutting performance is provided despite the provision of the opening guide wire. It became clear that it was not possible to demonstrate.
No. In the application of 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 breaks due to the impact at the time of dropping, and the fall It was shown that the test score dropped significantly.
The result of Experiment 1 shows that the scratch processing of the opening guide line is performed on the stretched film closest to the sealant is a necessary condition for imparting the performance at the time of tear opening. However, in the case of heavy-weight packaging, it is suggested that if the entire stretched base film layer is scratched, the required impact resistance may not be obtained. It has been shown that by scratching only the layer, the problem can be solved by achieving both tear performance and impact resistance performance.

<Experiment 2>
The laminate and the packaging bag used in Experiment 2 were produced 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”.
Specific materials 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 of UACJ Co., Ltd., 1N30 general foil.
Low density polyethylene: “Sumikasen (registered trademark)” L705 manufactured by Sumitomo Chemical Co., Ltd.
Anchor agent: manufactured by Toyo Morton Co., Ltd., adhesive for extrusion lamination 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 laminate. The production of the three-sided bag and the formation of the opening guide line were the same as in Experiment 1. However, in Experiment 2, the base film layer provided with perforations is only a biaxially stretched PET film, but the case where the scratch processing penetrates the film and the case where it does not penetrate are made differently. In the case of non-penetrating, the blade pressing pressure during the easy opening process was intentionally reduced.

<Evaluation of tearability>
The same evaluation method as in Experiment 1 was performed.

<Drop test>
Unlike Experiment 1, the contents inside the pouch were closed by sealing the mouth after filling with 50 mL of water. Hot water retort sterilization treatment and storage in a cold state were not performed, and five free drops were continuously performed from a height of 180 cm in a room temperature state. Visual leak judgment and scoring were performed by the same method as in Experiment 1.

<Experimental result>
Table 3 shows the tearing evaluation results and the drop test results in Experiment 2. Since the weight of the contents was reduced, there were no specimens that were destroyed by dropping, but there was a certain tendency for the straight-line cutability during the tearing operation.
No. in which scratch processing penetrates the base film layer. 2-1 and 2-2 showed good linear cut properties. Scratch processing is non-penetrating through the base film layer, and No. Similarly, in 2-4, it was clarified that the linear cut property was obtained in all the specimens. On the other hand, no. 2-3 is No. with no guide wire. It was shown that the tear 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.

DESCRIPTION OF SYMBOLS 10 ... Easy-open packaging body, 11 ... Laminated body, 12 ... Seal part, 13 ... Mouth part, 14 ... Opening guide wire, 15 ... Opening start means, 20 ... Guide part, 21 ... Scratch processing, 22 ... 1st end , 23 ... second end, 24 ... hatched portion, 25 ... center line, 31 ... sealant layer, 32 ... metal foil, 33 ... intermediate resin layer, 34 ... outermost resin layer.

Claims (6)

It 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 overlapped, and seals a peripheral portion of the laminate arranged so that the sealant layers are opposed to each other. A package formed in a pouch shape,
Only the base film layer is provided with an opening guide line by scratching, and the scratch processing is made at least on the surface of the base film layer closer to the sealant layer. Sex packaging.   The easy-open packaging body according to claim 1, wherein an opening start means is provided on a peripheral portion of the easy-open packaging body.   The easy-open packaging body according to claim 1 or 2, wherein the base film layer includes a plastic film stretched in at least a uniaxial direction.   The easy-open packaging body according to any one of claims 1 to 3, wherein the base film layer includes a biaxially stretched film.   The biaxially stretched film was selected from any one or more of a biaxially stretched polyester film, a biaxially stretched polyamide film, a biaxially stretched polypropylene film, and a material whose surface was vapor-deposited or coated. The easy-open packaging body according to claim 4, wherein   The easy-open packaging body according to any one of claims 1 to 5, wherein the base film layer is a laminate of a plurality of stretched films.

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