WO2020059629A1 - 易開封性包装袋並びにガスバリア性を備えた易開封性積層フィルムおよびパウチ - Google Patents
易開封性包装袋並びにガスバリア性を備えた易開封性積層フィルムおよびパウチ Download PDFInfo
- Publication number
- WO2020059629A1 WO2020059629A1 PCT/JP2019/035865 JP2019035865W WO2020059629A1 WO 2020059629 A1 WO2020059629 A1 WO 2020059629A1 JP 2019035865 W JP2019035865 W JP 2019035865W WO 2020059629 A1 WO2020059629 A1 WO 2020059629A1
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- WO
- WIPO (PCT)
- Prior art keywords
- film
- opening
- easy
- layer film
- packaging bag
- Prior art date
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Images
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- B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
Definitions
- the first invention of the present application relates to a packaging bag excellent in tear-opening property, in which a laminated film is sealed by heat sealing. Further, the second invention of the present application relates to an easily-openable laminated film and a pouch having gas barrier properties.
- Patent Document 2 a method is devised in which the tearing force is reduced by blending a specific polymer, and the molecular orientation angle is 22.5 ° or less.
- the laminated film has a configuration in which at least three films of an outer layer film, a barrier layer, and an inner layer film are laminated, and a bag-like pouch is formed from the laminated film.
- the laminated film requires a gas barrier layer in addition to the outer layer film and the inner layer film.
- Patent Document 3 when opening such a pouch, an opening guide flaw is formed so that the pouch can be easily opened. This is because a resin such as unstretched polypropylene is usually used as the inner layer film of the pouch, so that it cannot be easily opened by hand.
- an object of the first invention of the present application is to provide an easily-openable packaging bag using a biaxially stretched film having a large range of molecular orientation angles, which has not been known hitherto.
- Another object of the first invention of the present application is to provide an easily-openable packaging bag that is resistant to temperature changes.
- An object of the second invention of the present application is to provide a laminated film and a pouch that do not deteriorate the barrier performance even when an opening guide flaw is provided.
- the first invention of the present application is a packaging bag for sealing by laminating a laminated film by heat sealing, wherein the laminated film comprises: an inner film; An outer layer film made of a film, wherein the molecular orientation angle of the outer layer film is less than 49 °.
- good barrier performance can be obtained by providing a barrier ink covering the opening-induced flaw of the barrier layer between the outer layer film and the barrier layer.
- the present invention is as follows. 1. A laminated film comprising (a) an outer layer film, (b) a barrier layer having an opening-induced flaw, and (c) an inner layer film, wherein the barrier film covers the opening-induced flaw of the barrier layer. 2.
- the outer layer film is a film having a linear cut property. 3.
- a pouch comprising the laminated film according to 1.
- the molecular orientation angle of the outer layer film is much larger than the conventional molecular orientation angle. Even if a biaxially stretched film having corners is used, a packaging bag excellent in tear openability can be obtained.
- the occurrence of delamination of the outer layer film due to the elongation of the inner layer film caused by tearing and opening at high temperature due to hot water bathing or microwave heating is suppressed, and the opening induction flaw is reduced.
- tear-opening a packaging bag having excellent tear-opening properties can be obtained.
- the second invention of the present application it is possible to obtain a laminated film and a pouch having easy-openability while maintaining excellent barrier properties.
- FIG. 1 shows a cross-sectional view of a conventionally used easy-opening laminated film having a barrier layer as an intermediate layer. It is sectional drawing which represented the laminated film by this invention typically.
- ⁇ Inner layer film> As the inner layer film to be the innermost layer of the packaging bag of the first invention of the present application, various known materials can be used, and for example, a polyolefin having heat sealing properties can be used. Examples of such polyolefins include low-, medium-, or high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, syndiotactic polypropylene, ethylene-propylene copolymer, polybutene-1, and poly4-methyl.
- ethylene-butene-1 copolymer propylene-butene-1 copolymer, ethylene-propylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, ion-crosslinked olefin copolymer (ionomer) And an ethylene-acrylate copolymer.
- a propylene-based polymer is suitable from the viewpoint of heat resistance, and homopolypropylene, a random copolymer mainly composed of propylene, and a block copolymer can be used.
- outer layer film used in the first invention of the present application various known materials can be used, and an orientation angle can be obtained by biaxial stretching, and examples thereof include polyamide and polyester.
- the polyamide include nylon 6, nylon 66, nylon 46, nylon 69, nylon 610, nylon 612, nylon 11, nylon 12, nylon MXD6, and the like. Is preferred.
- the polyester a polycondensate obtained by polymerization of a monomer having an aromatic dicarboxylic acid or an aliphatic dicarboxylic acid and a diol as components, such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), is preferable.
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- a barrier layer is formed on the outer layer film.
- the barrier layer may be formed on the outer surface side of the outer layer film, or on the intermediate layer film side, but may be formed on the intermediate layer film side in that the barrier layer is protected from damage from outside the packaging bag. It is desirable to form.
- the barrier layer is formed by depositing an inorganic substance such as silicon oxide, ceramic such as alumina, carbon, or the like by chemical vapor deposition (CVD), a vacuum deposition method, a sputtering method, an ion plating method, or the like.
- CVD chemical vapor deposition
- a coating layer containing a barrier resin coating agent composed of a polycarboxylic acid polymer, vinylidene chloride, ethylene vinyl alcohol copolymer or the like may be formed.
- At least one intermediate layer can be provided between the inner layer film and the outer layer film.
- the intermediate layer film various known materials can be used, and it is preferable to use polybutylene terephthalate (PBT), polyethylene terephthalate (PET), or a blend thereof with low hygroscopicity.
- PBT polybutylene terephthalate
- PET polyethylene terephthalate
- an opening guide flaw is formed on the intermediate layer film at a location corresponding to the tear opening location of the packaging bag.
- the opening guide flaw is formed as a groove or perforation by laser processing or a rotary cutter.
- the laminated film used in the first invention of the present application can be obtained by laminating an inner layer film, an intermediate layer film, and an outer layer film by a usual dry lamination method using a polyurethane adhesive.
- the packaging bag according to the first invention of the present application can be formed by using the laminated film, overlapping the inner layer films so as to face each other, and heat sealing.
- the form of the pouch is not particularly limited, and includes a four-sided seal pouch and a standing pouch.
- ⁇ Molecular orientation angle> Usually, in the case of a biaxially stretched film, when the flow direction of the film is set to an angle of 0 °, a molecular orientation direction, that is, a portion having a different molecular orientation angle is formed. And the molecular orientation angle of the extension part tends to be large. Then, in the first invention of the present application, one having a molecular orientation angle of less than 49 ° is selected and used as the outer layer film of the packaging bag. A detailed method for measuring the molecular orientation angle of the outer layer film is described in Examples, but the molecular orientation angle in the flow direction of the outer layer film is determined, and it is necessary that the angle be less than 49 °.
- the molecular orientation angle when the molecular orientation angle is 49 ° or more, delamination of the laminated film may occur at the time of tear opening.
- the lower limit of the molecular orientation angle of the outer layer film is not particularly limited, and examples thereof include those exceeding 15 °, those exceeding 22.5 °, and those exceeding 30 °.
- the easy-opening laminated film 10 uses a material having a linear cut property as the outer layer film (linear cut property film) 12.
- a conventional polyester-based straight-cut film can be used as the straight-cut film.
- Examples of the film having a linear cut property include a film made of a blend of polybutylene terephthalate containing polytetramethylene glycol units and polyethylene terephthalate, or a film made of polyethylene terephthalate and a polyester elastomer, in which a polyester elastomer is dispersed in polyethylene terephthalate. And a film obtained by biaxially stretching a film or the like made of a blended product.
- the barrier layer 13 is located between the outer layer film (straight-cut film) 12 and the inner layer film 14.
- the barrier layer 13 may be in direct contact with the inner layer film 14 or may be laminated with another layer interposed therebetween.
- the opening guide flaw 5 is provided on the barrier layer 13, and the opening guide flaw 15 reaches a part of the inner layer film 14.
- the material of the barrier layer is not particularly limited as long as the material prevents deterioration of the contents when formed into a pouch.
- resins such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC resin), polymethaxylene adipamide (MXD6), and polyvinyl alcohol (PVA) and combinations thereof can be mentioned.
- EVOH ethylene-vinyl alcohol copolymer
- PVDC resin polyvinylidene chloride resin
- MXD6 polymethaxylene adipamide
- PVA polyvinyl alcohol
- a barrier layer a chemical vapor deposition (CVD method), a vacuum evaporation method, a sputtering method, an ion plating method, or the like, an inorganic substance such as silicon oxide, or a polyethylene terephthalate film on which ceramic such as alumina or carbon is deposited. And polybutadiene films.
- a barrier ink 16 is printed or applied on a side of the outer layer film (straight-cut film) 12 which is in contact with the barrier layer 13.
- the barrier ink 16 may be printed or applied over the entire outer layer film 12. However, the barrier ink 16 may be printed or applied so as to cover the opening guide flaws 5 or 5 to 10% larger than the opening guide flaws 15. Absent.
- a barrier ink 16 may be provided between the barrier layer 13 and the inner layer film 14 at a position covering the opening guide flaw 15, but a gravure printing step of printing a design such as a character, a picture, a logo on the outer layer film 12 is performed. Is preferably provided on the side of the outer layer film 12 in contact with the barrier layer 13 in that the barrier ink 16 can be printed.
- the material of the barrier ink is not particularly limited as long as it can reduce the desired performance deterioration of the barrier layer.
- resins such as ethylene-vinyl alcohol copolymer (EVOH) and polyvinyl alcohol (PVA);
- EVOH ethylene-vinyl alcohol copolymer
- PVA polyvinyl alcohol
- examples include a combination of a mica-like inorganic material and a metal alkoxide such as tetraethoxysilane.
- the opening guide flaw 15 After laminating the barrier layer 13 on the inner layer film 14 and irradiating the barrier layer 13 with, for example, a laser or the like, the opening guide flaw 15 can be formed. Further, the opening guide flaws 15 may be formed on the laminated film obtained by laminating the barrier layer 13 on the inner layer film 14 from the barrier layer 13 side with a rotary cutter.
- the barrier ink portion of the outer layer film (straight-cut film) 12 on which the barrier ink is printed or applied is laminated so as to cover the opening guide flaws 15 of the barrier layer 13, thereby facilitating the easy opening property according to the present invention.
- a laminated film can be manufactured.
- Examples 1 to 8, Comparative Examples 1 to 8) ⁇ Measurement of molecular orientation angle of outer layer film>
- a phase difference measuring device (KOBRA-21ADH) manufactured by Oji Scientific Instruments, an outer layer film (biaxially stretched polyethylene terephthalate film) was cut out from the center in the film width direction at a width of 5.0 cm and a flow direction of 4.0 cm.
- the film was installed in the apparatus so that the film flow direction was at an angle of 0 ° defined by the present measuring apparatus, and the absolute value was used as the measurement result.
- a polybutylene terephthalate film having a thickness of 15 ⁇ m as an intermediate layer film and a polypropylene film having a thickness of 70 ⁇ m as an inner layer film were laminated by dry lamination using a polyurethane adhesive.
- the opening induction flaw was formed by half cutting using a rotary cutter from the polybutylene terephthalate film side of the laminated film created in the first laminating step.
- a flat pouch having a height of 170 mm and a width of 130 mm was produced from the laminated film prepared in the second laminating step by heat sealing so that the flow direction of the laminated film was the opening direction.
- ⁇ Pouch heating with hot water> In a high temperature water tank (BF600) manufactured by Yamato Corporation, the pouch was put in hot water set to a predetermined temperature, and heated for 20 minutes. The contents were filled with 180 ml of water, and the top of the pouch was sealed by heat sealing.
- BF600 high temperature water tank
- a laminated film is formed by dry lamination using a polyurethane-based adhesive with a 12 ⁇ m-thick alumina-evaporated biaxially stretched polyethylene terephthalate film having a thickness of 12 ⁇ m as the barrier layer 13 and a 70 ⁇ m-thick polypropylene film as the inner layer film did.
- the opening guide flaw 15 was formed from the alumina-deposited biaxially stretched polyethylene terephthalate film side of the laminated film created in the first laminating step using a rotary cutter.
- a barrier ink 16 obtained by mixing tetraethoxysilane and polyvinyl alcohol with a biaxially stretched polyester film having a thickness of 12 ⁇ m and having a linear cut property to become the outer layer film 12 is gravure-printed as shown in FIG. After partial application, it was dried.
- the laminated film formed in the first laminating step is bonded to the biaxially stretched polyester film having a linear cut property formed in the barrier ink coating step on the laminated film having the opening guide flaws 15 formed thereon by polyurethane-based bonding.
- a laminated film was prepared by dry lamination using the agent. At this time, as shown in FIG. 5, a laminated film was formed such that the barrier ink 16 covered the opening guide flaws 15.
- a publicly known flat pouch was prepared from this laminated film.
- Example 10 A laminated film was produced in the same manner as in Example 9, except that the barrier ink 16 was changed to a mixture of a mica-like inorganic material and an ethylene-vinyl alcohol copolymer. A publicly known flat pouch was prepared from this laminated film.
- Example 9 A laminated film similar to that of Example 9 was prepared except that the barrier ink 16 was not applied and the opening guide flaw 15 was not formed. A publicly known flat pouch was prepared from this laminated film.
- Example 10 A laminated film similar to that of Example 1 was prepared except that the barrier ink 16 was not applied. Using this laminated film, a known flat pouch was prepared.
- Table 3 shows that the easily-openable barrier laminate film of the present invention has good oxygen barrier properties.
- the pouches of Example 9 and Example 10 had good openability.
- an easily-openable packaging bag using a biaxially stretched film having a molecular orientation angle larger than the conventional molecular orientation angle can be obtained. Further, it is possible to obtain a packaging bag in which tearing caused by a rise in temperature, which has not been known, is eliminated. According to the second invention of the present application, it is possible to obtain a laminated film and a pouch having easy-opening properties while maintaining excellent barrier properties.
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Abstract
Description
また、本出願の第2の発明は、ガスバリア性を備えた易開封性積層フィルムおよびパウチに関する。
さらに、特許文献2においては、特定のポリマーをブレンドすることにより引裂き力を低下させた上で、分子配向角を22.5°以下とする工夫がなされている。
一方、例えば食品を充填した包装袋は、レトルト食品を充填したものを、開封前に湯煎等で内容物を温めて使用する場合が多い。
この場合も、包装袋の易開封性が重要となるが、われわれはこの度、包装袋の温度の違いにより、易開封性が大きく異なることをはじめて見出した。即ち、湯煎の温度が30℃~98℃に上昇するに従い、易開封性が低下し、開封にあたり積層フィルムのデラミネーションが生じやすくなることを見出した。
また、上述のように開封誘導疵を設ける場合、バリア層の一部を欠落させる必要があり、当然その部分ではバリア性能が低下するという問題があった。
また、本出願の第1の発明の課題は、温度変化に対して耐性のある易開封性包装袋を提供することにある。
1.(a)外層フィルム、(b)開封誘導疵を有するバリア層、(c)内層フィルム、を、積層したフィルムであって、前記バリア層の開封誘導疵を覆うバリアインキを有する、積層フィルム。
2.前記外層フィルムが、直線カット性を有するフィルムである、1.に記載の積層フィルム。
3.1.または2.に記載の積層フィルムからなる、パウチ。
本出願の第1の発明の包装袋の最内層となる内層フィルムとしては、公知の種々の材料を用いることができ、例えば、ヒートシール性を有するポリオレフィンを使用することができる。
このようなポリオレフィンとしては、例えば低密度、中密度或いは高密度のポリエチレン、線状低密度ポリエチレン、アイソタクティックポリプロピレン、シンジオタクティックポリプロピレン、エチレン-プロピレン共重合体、ポリブテン-1、ポリ4-メチル-1-ペンテン、エチレン-ブテン-1共重合体、プロピレン-ブテン-1共重合体、エチレン-プロピレン-ブテン1共重合体、エチレン-酢酸ビニル共重合体、イオン架橋オレフィン共重合体(アイオノマー)、エチレン-アクリル酸エステル共重合体等が挙げられる。これらの単独でも、或いは2種以上のブレンド物の形でも使用することができる。
特に耐熱性の観点からプロピレン系重合体が適当であり、ホモポリプロピレンや、プロピレンを主体とするランダム共重合体やブロック共重合体を使用することができる。
本出願の第1の発明に用いる外層フィルムは、公知の種々の材料を用いることができ、二軸延伸により配向角が得られるものであり、例えば、ポリアミド、ポリエステル等を挙げることができる。
ポリアミドとしては、例えば、ナイロン6、ナイロン66、ナイロン46、ナイロン69、ナイロン610、ナイロン612、ナイロン11、ナイロン12、ナイロンMXD6等を挙げることができるが、取り扱いやすさから、ナイロン6あるいはナイロン66が好ましい。
ポリエステルとしては、ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート(PBT)等、芳香族ジカルボン酸または脂肪族ジカルボン酸とジオールとを構成成分とする単量体からの重合により得られる縮重合体が好ましい。これらの中で、PBT、PETが好ましく、PETがより好ましい。
また、外層フィルムにはバリア層が形成されていることが好ましい。バリア層は、外層フィルムの外面側、或いは中間層フィルム側の、いずれかの面に形成されていてもよいが、バリア層に包装袋外部からのダメージから保護するという点で中間層フィルム側に形成することが望ましい。
バリア層としては、ケミカルベーパーデポジション(CVD)、真空蒸着法、スパッタリング法、イオンプレーティング法等で、シリコンオキサイド等の無機物、或いはアルミナ等のセラミック、カーボン等を蒸着することにより形成される。
また、ポリカルボン酸系ポリマー、塩化ビニリデン、或いはエチレンビニルアルコール共重合体等からなるバリア性樹脂コーティング剤を含む塗膜層を形成してもよい。
本出願の第1の発明において、内層フィルムと外層フィルムとの間には、少なくとも1層の中間層を設けることができる。
中間層フィルムとして、公知の種々の材料を用いることができ、吸湿性の低いポリブチレンテレフタレート(PBT)やポリエチレンテレフタレート(PET)、これらのブレンド物を使用することが好ましい。
特に、吸湿性が低いことと、包装袋が落下破袋を防止するために耐衝撃性のあるポリブチレンテレフタレート(PBT)を使用することが好ましい。
また、中間層フィルムには、包装袋の引き裂き開封箇所に相当する箇所に開封誘導疵を形成することが好ましい。
開封誘導疵としては、レーザー加工やロータリーカッターによる凹溝やミシン目として形成される。
本出願の第1の発明に用いる積層フィルムは、ポリウレタン系接着剤を使用して、内層フィルム、中間層フィルム、外層フィルムを通常のドライラミネート法によって積層することにより得ることができる。
本出願の第1の発明に係る包装袋は、前記積層フィルムを用い、内層フィルム同士が向き合うように重ね合わせてヒートシールすることにより成形することができる。パウチの形態は特に限定されず、四方シールパウチやスタンディングパウチが挙げられる。
通常、二軸延伸フィルムは、フィルムの流れ方向を角度0°とした場合、分子の配向方向、すなわち、分子配向角度が異なる部分が形成され、一般的には、フィルムの中央部分の分子配向角度が小さく、外延部分の分子配向角度が大きくなる傾向にある。
そして、本出願の第1の発明では、分子配向角度が49°未満のものを選定して、包装袋の外層フィルムとして使用する。
外層フィルムの分子配向角の詳細な測定方法は、実施例に記載するが、当該外層フィルムの流れ方向の分子配向角を求め、これが49°未満であることが必要となる。比較例にて詳細に説明するが、分子配向角が49°以上であると、引裂き開封時に積層フィルムのデラミネーションが起こる場合がある。
なお、外層フィルムの分子配向角の下限としては、特に限定されないが、例えば、15°を超えるもの、22.5°を超えるもの、さらには30°を超えるものなどを挙げることができる。
図5において、本発明に係る易開封性積層フィルム10は、外層フィルム(直線カット性フィルム)12として、直線カット性を有する材料が用いられる。
本出願の第2の発明において、バリア層13は、外層フィルム(直線カット性フィルム)12と、内層フィルム14との中間に位置する。そして、バリア層13は、内層フィルム14と直接接しているか、または他の層を挟んで積層されていてもよい。ここで、バリア層13には、開封誘導疵5が設けられており、この開封誘導疵15は内層フィルム14の一部に達している。
外層フィルム(直線カット性フィルム)12のバリア層13に接する側には、バリアインキ16が印刷または塗布されている。バリアインキ16は、外層フィルム12の全体に亘り印刷または塗布されていてもよいが、開封誘導疵5を覆う大きさ、あるいは開封誘導疵15より5~10%大きく印刷または塗布されていてもかまわない。
内層フィルム14にバリア層13を重ねて積層したのち、例えばレーザ等をバリア層13に照射することにより、開封誘導疵15を形成できる。また、内層フィルム14にバリア層13を積層した積層フィルムにバリア層13側からロータリーカッターで開封誘導疵15を形成してもよい。
本出願の第2の発明の易開封性積層フィルムを使用して、公知の形状のスタンディングパウチや平パウチ作成することができ、内容物を充填後、充填口をヒートシールすることにより、バリア性能に優れた積層フィルムからなる易開封パウチを得ることができる。
<外層フィルムの分子配向角の測定>
王子計測機器社製の位相差測定装置(KOBRA-21ADH)を用い、外層フィルム(二軸延伸ポリエチレンテレフタレートフィルム)をフィルム幅方向中央部から幅方向5.0cm×流れ方向4.0cmで切り出した。フィルム流れ方向が本測定装置にて定義されている角度0°となるように装置に設置し、その絶対値を測定結果とした。
第一積層工程において、中間層フィルムとして厚さ15μmのポリブチレンテレフタレートフィルムと、内層フィルムとして厚さ70μmのポリプロピレンフィルムを、ポリウレタン系接着剤を使用してドライラミネーションにより積層フィルムを作製した。
開封誘導疵の形成工程において、第一積層工程で作成した積層フィルムのポリブチレンテレフタレートフィルム側からロータリーカッターを使用してハーフカットで開封誘導疵を形成した。
第二積層工程において、開封誘導疵を形成した積層フィルムのポリブチレンテレフタレートフィルム面に、ポリウレタン系接着剤を使用して、酸化アルミニウム蒸着二軸延伸ポリエチレンテレフタレートフィルムをドライラミネーションにより積層し、積層フィルムを作製した。
上記第二積層工程で作成した積層フィルムから、積層フィルムの流れ方向が開封方向となるように、ヒートシールすることにより、高さ170mm、幅130mmの平パウチを作製した。
ヤマト社製 高温水槽(BF600)にて、所定の温度に設定した湯中にパウチを入れ、20分加熱を行った。なお内容物としては、水を180ml入れ、パウチの上部をヒートシールにより密閉した。
上記の湯煎で温めた各パウチについて易開封性試験を行い、引裂き開封した切断部分を目視によって観察した。開封誘導疵に沿って開封されたものは○印、外層フィルムの一部が開封誘導疵から外れたものは△印、外層フィルムが開封誘導疵から完全に外れてしまったものは×印、と判定した。
表1および2に結果をまとめて示す。
さらに、表2の比較例1および4から、湯煎温度によって、易開封性が大きく左右されることが、本研究から初めてわかった。
そして、湯煎が30~98℃の温度範囲において、外層フィルムの分子配向角が49°未満であれば、易開封性が確保できることがわかった。
第一積層工程において、バリア層13として厚さ12μmのアルミナ蒸着二軸延伸ポリエチレンテレフタレートフィルムと内層フィルム14として厚さ70μmのポリプロピレンフィルムを、ポリウレタン系接着剤を使用してドライラミネーションにより積層フィルムを作成した。
この積層フィルムから公知の平パウチを作成した。
バリアインキ16を雲母状無機材料とエチレン-ビニルアルコール共重合体を混合したものに変更した以外は実施例9と同様の積層フィルムを作成した。
この積層フィルムから公知の平パウチを作成した。
バリアインキ16を塗布せず、開封誘導疵15を形成しないこと以外は、実施例9と同様の積層フィルムを作成した。
この積層フィルムから公知の平パウチを作成した。
バリアインキ16を塗布しない以外は、実施例1と同様の積層フィルムを作成した。
この積層フィルムを用いて、公知の平パウチを作成した。
各実施例、比較例で作成したパウチから測定片を切り出し、MOCON法によって、温度23℃、相対湿度60%にて、酸素透過度(cc/m2・day・atm)を測定した。結果を表3に示す。
また、従来知られていなかった温度上昇に伴う引裂きにくさを解消した包装袋を得ることができる。
本出願の第2の発明によれば、優れたバリア性を維持しながら、易開封性を有する積層フィルムおよびパウチを得ることができる。
2 外層フィルム
3 中間層フィルム
4 内層フィルム
5 開封誘導疵
10 デラミネーションを起こした外層フィルム
11 従来の易開封性積層フィルム
12 外層フィルム(直線カット性フィルム)
13 バリア層
14 内層フィルム
15 開封誘導疵
16 バリアインキ
17 圧着方向
20 本発明の易開封性積層フィルム
Claims (6)
- 積層フィルムをヒートシールすることにより密封する包装袋であって、
前記積層フィルムが、内層フィルムと、開封誘導疵を形成した中間層フィルムと、二軸延伸フィルムを含む外層フィルムと、を備え、
前記外層フィルムの分子配向角が49°未満であることを特徴とする、易開封性包装袋。 - 外層フィルムが、ポリアミドまたはポリエステルまたはポリブチレンテレフタレートである、請求項1に記載の易開封性包装袋。
- 中間層フィルムがポリブチレンテレフタレートである請求項1または2に記載の易開封性包装袋。
- (a)外層フィルム、
(b)開封誘導疵を有するバリア層、
(c)内層フィルム、
を、積層したフィルムであって、
前記バリア層の開封誘導疵を覆うバリアインキを有する、積層フィルム。 - 前記外層フィルムが、直線カット性を有するフィルムである、請求項4に記載の積層フィルム。
- 請求項4または5に記載の積層フィルムからなる、パウチ。
Priority Applications (5)
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US17/278,059 US20210347144A1 (en) | 2018-09-21 | 2019-09-12 | Easy-open packaging bag, and easy-open laminate film and pouch having gas barrier properties |
EP19861930.6A EP3854722A4 (en) | 2018-09-21 | 2019-09-12 | EASY OPEN PACKAGING BAG, AND EASY OPEN LAMINATE FILM AND POUCH WITH GAS BARRIER PROPERTIES |
CN201980061189.6A CN112714742A (zh) | 2018-09-21 | 2019-09-12 | 易开封性包装袋以及具备阻气性的易开封性层叠膜及袋 |
KR1020217011574A KR20210060584A (ko) | 2018-09-21 | 2019-09-12 | 개봉 용이성 포장 백 그리고 가스 배리어성을 구비한 개봉 용이성 적층 필름 및 파우치 |
US18/526,937 US20240092053A1 (en) | 2018-09-21 | 2023-12-01 | Easy-open packaging bag, and easy-open laminate film and pouch having gas barrier properties |
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JP2018-177412 | 2018-09-21 | ||
JP2018177412A JP7310109B2 (ja) | 2018-09-21 | 2018-09-21 | ガスバリア性を備えた易開封性積層フィルムおよびパウチ |
JP2018-210588 | 2018-11-08 | ||
JP2018210588A JP7223249B2 (ja) | 2018-11-08 | 2018-11-08 | 易開封性包装袋 |
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US17/278,059 A-371-Of-International US20210347144A1 (en) | 2018-09-21 | 2019-09-12 | Easy-open packaging bag, and easy-open laminate film and pouch having gas barrier properties |
US18/526,937 Division US20240092053A1 (en) | 2018-09-21 | 2023-12-01 | Easy-open packaging bag, and easy-open laminate film and pouch having gas barrier properties |
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WO2020059629A1 true WO2020059629A1 (ja) | 2020-03-26 |
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PCT/JP2019/035865 WO2020059629A1 (ja) | 2018-09-21 | 2019-09-12 | 易開封性包装袋並びにガスバリア性を備えた易開封性積層フィルムおよびパウチ |
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US (2) | US20210347144A1 (ja) |
EP (1) | EP3854722A4 (ja) |
KR (1) | KR20210060584A (ja) |
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WO (1) | WO2020059629A1 (ja) |
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- 2019-09-12 WO PCT/JP2019/035865 patent/WO2020059629A1/ja active Application Filing
- 2019-09-12 CN CN201980061189.6A patent/CN112714742A/zh active Pending
- 2019-09-12 EP EP19861930.6A patent/EP3854722A4/en active Pending
- 2019-09-12 US US17/278,059 patent/US20210347144A1/en active Pending
- 2019-09-12 KR KR1020217011574A patent/KR20210060584A/ko not_active Application Discontinuation
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US20210347144A1 (en) | 2021-11-11 |
US20240092053A1 (en) | 2024-03-21 |
EP3854722A4 (en) | 2022-06-15 |
CN112714742A (zh) | 2021-04-27 |
KR20210060584A (ko) | 2021-05-26 |
EP3854722A1 (en) | 2021-07-28 |
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