JP3867474B2 - Easy-open composite film and packaging container - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、食品等の包装に用いる包装用易開封性複合フィルム、より詳細には特にボイル、セミレトルト等の加熱殺菌を施した食品の包装体において熱封着性及び易開封性を備えた複合フィルムに関するものである。
【０００２】
【従来の技術】
従来、ボイル、レトルト等の加熱殺菌処理を施す食品等の包装体には、加熱殺菌処理時に耐えるような強固な熱封緘強度を施した包装体が広く使用されている。しかし、このような包装体を用いた場合、蓋材開封時に、大きな力を要する為、内容物が漏れたり、汁が吹き出したりするという取り扱い上の煩わしさがあった。そこで、これまで開封を容易にすべく、例えば、２種以上のポリオレフィンの混合物による積層フィルム、エチレン−αオレフィン共重合体やエチレン−酢酸ビニル共重合体を用いた積層フィルムを、易開封性の蓋材として使用し、開封時に容易に開封させる技術が知られている。しかし、前記の易開封性包装容器は、使用された蓋材フィルムの加熱後の開封性を容易にすると加熱殺菌中に破裂して内容物が漏れたり、加熱時の熱封緘強度を強くすると容易に開封出来ない等の問題があった。
【０００３】
【発明が解決しようとする課題】
本発明の課題は、食品等の内容物に用いられる包装用フィルムとして加熱殺菌処理に耐えるが、容易に開封することができる熱封緘強度を有する包装用複合フィルム並びに該フィルムを用いた包装容器を提供することにある。
【０００４】
【課題を解決するための手段】
本発明者等は上記課題を解決すべく、鋭意検討を重ねた結果、ポリプロピレン、又は、プロピレンとその他のαオレフィンとの共重合体を主体とする層と、ポリプロピレンと融点が１２０℃以上の高密度ポリエチレンもしくは直鎖上低密度ポリエチレンとの混合物を主体とする第２層との複合フィルムを用いて、包装袋とするか、或は、該複合フィルムを容器の蓋材フィルムとして使用することにより加熱殺菌時の破裂並びに易開封性を改善できることを見いだし本発明を完成するに至った。
【０００５】
即ち、本発明の第一の構成は、第１層と第２層が共押出積層された易開封性包装用複合フィルムであって、第１層が、ポリプロピレン又はプロピレンとその他のαオレフィンとの共重合体を有する樹脂成分（Ａ）を含有するヒートシール層であり、第２層が、ポリプロピレン１〜２０重量％と、融点１２０℃以上の高密度ポリエチレン又は直鎖状低密度ポリエチレン９９〜８０重量％との混合物を有する樹脂成分（Ｂ）を含有することを特徴とする易開封性包装用複合フィルムである。
【０００６】
又、本発明の第二の構成は、合成樹脂製容器底材と、蓋材フィルムとからなり、該容器底材の開口鍔部に該蓋材フィルムを熱封着することにより内容物を密閉し得る包装容器であって、合成樹脂製容器底材が、ポリプロピレン又はプロピレンとその他のαオレフィンとの共重合体、もしくはポリプロピレンとその他の熱可塑性樹脂の混合物から構成されており、蓋材フィルムが、第１層と第２層が共押出積層された複合フィルムであって、第１層が、ポリプロピレン又はプロピレンとその他のαオレフィンとの共重合体を有する樹脂成分（Ａ）を含有するヒートシール層であり、第２層が、ポリプロピレン１〜２０重量％と、融点１２０℃以上の高密度ポリエチレン又は直鎖状低密度ポリエチレン９９〜８０重量％との混合物を有する樹脂成分（Ｂ）を含有する易開封性包装用複合フィルムであり、該蓋材フィルムの第１層が、内容物を充填した状態で前記底材開口鍔部に熱封着されることを特徴とする包装容器である。
【０００７】
【発明の実施の形態】
本発明の易開封性包装用複合フィルムは、樹脂成分（Ａ）を含有する層から構成される第１層と、樹脂成分（Ｂ）を含有する層から構成される第２層とを必須の層構成とするものであり、樹脂成分（Ａ）含有層と樹脂成分（Ｂ）含有層とを共押出法によって得られるものである。この際、第１層が他のフィルム若しくは容器底材開口鍔部との熱封着に供され、第２層は、第１層との層間剥離強度に寄与するものである。また、当該複合フィルムは、第１層及び第２層のみから構成される複合フィルムとして使用できることは勿論のことであるが、第２層上に更に基材フィルムが積層されていることが、易開封性包装袋或は易開封性包装容器にした場合の熱封着性、易剥離性の点から好ましい。
【０００８】
第１層及び第２層の共押出フィルムの第２層上に基材フィルムを積層する方法としては、特に限定されないが、熱可塑性樹脂を第１層、第２層と共に共押出してもよいし、接着剤を用いて積層してもよいし、熱ラミネート加工を施してもよい。
【０００９】
第１層に用いられる樹脂成分（Ａ）は、ポリプロピレン、または、プロピレンとその他のαオレフィンとの共重合体を主たる樹脂成分として含有している。本発明においては、この様な樹脂成分（Ａ）を用いることにより、熱封着が可能な他、合成樹脂性容器との密封性を著しく改善することができ、かつ、易開封性を兼備したものとなる。
【００１０】
ここで、プロピレンとその他のαオレフィンとの共重合体は、αオレフィン含有率が１〜１０重量％であることが、熱封着性、密封性、耐熱性の点から好ましい。
【００１１】
この様な第１層の膜厚は特に制限されるものではないが、第１層と第２層との間での層間剥離が容易に生じる点から０．５〜２０μｍであることが好ましい。
【００１２】
次に第２層に用いられる樹脂成分（Ｂ）は、ポリプロピレン１〜２０重量％と、融点１２０℃以上の高密度ポリエチレンもしくは直鎖状低密度ポリエチレン９９〜８０重量％を成分として含有するものである。本発明においては、この様な樹脂を第２層に有することから、樹脂成分（Ａ）との共押出成形が可能となり、また、優れた易剥離性を発現させることができる。
【００１３】
即ち、ポリプロピレンを増やすことにより、剥離強度を高められ、実用強度を向上させることができる。また、ポリエチレンを増やす場合には、層間易剥離性を改善させることができる。
【００１４】
また、本発明においては、既述の通り、第２層上に更に基材フィルムを設けることが好ましく、この際の基材フィルムを設ける方法としては、具体的には、ウレタン系接着剤を使用して二軸延伸ポリエチレンテレフタレートフィルム、二軸延伸ポリプロピレンフィルム、ＫＭセロハン等の基材を貼り合わせても良いし、第１層及び第２層と共に第２層上にポリエチレンのような熱可塑性樹脂を共押出しても良いし、あるいは、第２層上にポリエチレン等を溶融積層し、更にその上にウレタン系接着剤を使用して前記基材を貼り合わせても良い。
【００１５】
基材フィルムの膜厚は、用途によって異なり、特に限定されるものではないが、例えば、以下に詳述する本発明の包装容器の蓋材フィルムとして使用する場合には、２０〜５００μｍであることが好ましい。
【００１６】
この様にして得られる本発明の易開封性複合フィルムは、特にその用途が特定されるものではなく、例えば、各種食品包装用のピロー包装袋、或は、食品容器用蓋材として用いることができる。なかでも、以下に詳述する本発明の包装容器における蓋材として用いることが本発明の効果が顕著になる点から好ましい。何れの用途においても第１層が必ず熱封着或はヒートシールされる様に用いることが肝要である。
【００１７】
次に、本発明の包装容器について詳述する。本発明の包装容器は、合成樹脂製容器底材と、蓋材フィルムとからなり、該容器底材の開口鍔部に該蓋材フィルムを熱封着することにより内容物を密閉し得る包装容器であって、合成樹脂製容器底材が、ポリプロピレン又はプロピレンとその他のαオレフィンとの共重合体、もしくはポリプロピレンとその他の熱可塑性樹脂の混合物から構成されており、蓋材フィルムが、第１層と第２層が共押出積層された複合フィルムであって、第１層が、ポリプロピレン又はプロピレンとその他のαオレフィンとの共重合体を有する樹脂成分（Ａ）を含有し、第２層が、ポリプロピレンと、融点１２０℃以上の高密度ポリエチレン又は直鎖状低密度ポリエチレンとの混合物を有する樹脂成分（Ｂ）を含有する易開封性包装用複合フィルムであり、該蓋材フィルムの第１層が、内容物を充填した状態で前記底材開口鍔部に熱封着されることを特徴とする包装容器である。
【００１８】
ここで、蓋材フィルムとしては、特に限定されるものではないが、例えば、上記した本発明の易開封性複合フィルムが好ましく使用できる。また、該フィルムを構成する樹脂混合物（Ｂ）のポリエチレンとしては、融点１２０℃以上の高密度ポリエチレン若しくは直鎖状低密度ポリエチレンを用いることが、耐熱性や易剥離性、実用強度の調整が容易になる点から好ましい。また、蓋材フィルムは、基材フィルムを有していることが熱封着性、易剥離性、強度等の性能の点から好ましい。また、この際のそれぞれの膜厚は、第１層の膜厚が０．５〜１０μｍ、第２層の膜厚が０．５〜１００μｍ、基材フィルムの膜厚が２０〜５００μｍであることが好ましい。
【００１９】
また、合成樹脂製容器底材は、既述の通り、ポリプロピレン、または、プロピレンとその他のαオレフィンとの共重合体、もしくはポリプロピレンとその他熱可塑性樹脂の混合物から構成されているものであるが、本発明においては、熱封着性の点から蓋材フィルムの第１層と同種の樹脂であることが好ましい。
【００２０】
ここで、合成樹脂製容器底材とは、上面に開口部位を有し、かつ、該開口部位の周縁に鍔部を有している深絞容器状成形体をいい、例えば、図１のｂで示される部分である。
【００２１】
この様な本発明の包装容器の一例を図面により詳述すると、図１は本発明に係わる包装容器のヒートシール部分の断面図であり、ａが蓋材フィルム、ｂが包装容器底材であり、ｄが容器底材の開口鍔部であり、熱封着部である。また、蓋材フィルムａにおいて、ａ１が第１層、ａ２が第２層、ａ３が基材フィルムであり、開封時には、図１に示す様に第１層と第２層との間で層間剥離が生じるものである。また、食品等の内容物を充填した本発明の包装容器は、例えば、図２の斜視図に示される様になる。
【００２２】
この様な包装容器を製造するには、特にその製法が特定されるものではないが、例えば、容器底材に内容物充填後、蓋材フィルムを熱封着する方法が挙げられる。
【００２３】
熱封着の条件としては、特に限定されないが、蓋材フィルム第１層と深絞容器底材開口鍔部のシール層を貼り合わせ、圧力０．１〜４ＭＰa、温度１２０〜２５０℃、時間０．２〜５秒間の条件で熱封着することが好ましい。
【００２４】
このように熱封着されて得られる本発明の包装容器は、加熱殺菌時には充分な強度を有し、開封時には第１層と第２層とが層間剥離することにより、極めて容易に開封することができる。
【００２５】
また、熱封着により容器内に密閉される内容物は、特に限定されるものではないが、ボイル、セミレトルト等の加熱殺菌処理を施すものであることが本発明の効果が顕著なものとなる点から好ましい。
【００２６】
また、本発明の包装容器は蓋材フィルム第１層と容器底材鍔部との熱封着性が確実であり、開封時には第１層と第２層との層間剥離であるため安定した剥離強度が得られる。また蓋材フィルム第２層にポリプロピレンと融点１２０℃以上の高密度ポリエチレンもしくは直鎖状低密度ポリエチレンを使用しているため、殺菌時の熱封緘強度の低下は少ない。以下に実施例により本発明を具体的に説明するが、本発明はこれらに限定されるものではない。
【００２７】
【実施例】
実施例１
プロピレン−エチレン共重合体（エチレン含有率６重量％、密度０．９０ｇ／ｃｍ３、メルトインデックス７）よりなる膜厚３μｍの第１層１と、ポリプロピレン（密度０．９１ｇ／ｃｍ３、メルトインデックス１０）と直鎖状低密度ポリエチレン（密度０．９４ｇ／ｃｍ３、メルトインデックス３、融点１２２℃）の混合系で、この混合比が２０：８０重量％よりなる膜厚３μｍの第２層２と、高密度ポリエチレン（密度０．９５ｇ／ｃｍ３、メルトインデックス８）よりなる膜厚２４μｍの第３層３を有する共押出３層フィルムを製造し、加熱殺菌食品包装用合成樹脂蓋材とする。このフィルムを包装機を使用して内容物に米飯を用い、第１層と底材のポリプロピレンを主体とするシール層を接触させ、温度１６０℃、１７０℃、１８０℃、圧力０．２ＭＰａ、時間０．５秒の条件で熱封着する。この包装体を１２０℃にて加熱殺菌し、冷却後開封したところ、フィルムが破れることなく図１のようにきれいに開封することができた。また温度１２０℃、引張速度３００ｍｍ／ｍｉｎ、サンプル幅１５ｍｍ、１８０度剥離の条件下での剥離強度は次の通りであり、殺菌時に耐えうる充分な強度を有していた。また、温度２３℃、引張速度３００ｍｍ／ｍｉｎ、サンプル幅１５ｍｍ、１８０度剥離の条件下での剥離強度を表１に示す。優れた易開封性を示していた。
【００２８】
実施例２
ポリプロピレン（密度０．９１ｇ／ｃｍ３、メルトインデックス８）よりなる膜厚５μｍの第１層１とプロピレン−エチレン共重合体（密度０．９１ｇ／ｃｍ３、メルトインデックス２、融点１４２℃）とエチレン−ヘキセン１共重合体（密度０．９４ｇ／ｃｍ３、メルトインデックス６、融点１２１℃）の混合系で、混合比が１０：９０重量％よりなる膜厚２５μｍの第２層２よりなる膜厚３０μｍの共押出２層フィルムを製造し、ウレタン系接着剤を使用して二軸延伸ポリエチレンテレフタレートとラミネートし加熱殺菌食品用合成樹脂蓋材とする。このフィルムを包装機を使用して内容物に米飯を用い、第１層と底材のポリプロピレンを主体とするシール層を接触させ、温度１６０℃、１７０℃、１８０℃、圧力０．２ＭＰａ、時間０．５秒の条件で熱封着する。この包装体に加熱殺菌を９５℃にて施したところ、熱封着部からの破裂もなく、冷却後開封したところ、フィルムが破れることなく図１のようにきれいに開封することができた。また温度９５℃、引張速度３００ｍｍ／ｍｉｎ、サンプル幅１５ｍｍ、１８０度剥離の条件下での剥離強度は次の通りであり、殺菌に耐えうる充分な強度を有していた。また温度２３℃、引張速度３００ｍｍ／ｍｉｎ、サンプル幅１５ｍｍ、１８０℃剥離の条件下での剥離強度を表１に示す。易開封性を示していた。
【００２９】
比較例１
ポリプロピレン（密度０．９０ｇ／ｃｍ３、メルトインデックス５）からなる膜厚５μｍの第１層１とポリプロピレン（密度０．９０ｇ／ｃｍ３、メルトインデックス７、融点１３８℃）と低密度ポリエチレン（密度０．９０ｇ／ｃｍ３、メルトインデックス２、融点１０５℃）の混合系で、この混合比が１５：７５重量％よりなる膜厚５μｍの第２層とポリプロピレン（密度０．９０ｇ／ｃｍ３、メルトインデックス６）よりなる膜厚２０μｍの第３層３を有する共押出３層フィルムを製造し、加熱殺菌処理食品用合成樹脂蓋材とする。このフィルムを包装機を使用して内容物に惣菜を用い、第１層と底材のポリプロピレンを主体とするシール層を接触させ、温度１６０℃、１７０℃、１８０℃、圧力０．２ＭＰａ、時間０．５秒の条件で熱封着する。この包装体を９０℃にて加熱殺菌したところ、熱封着部が破れ内容物が漏れてしまった。温度２３℃、引張速度３００ｍｍ／ｍｉｎ、サンプル幅１５ｍｍ、１８０度剥離の条件下での剥離強度は次の通りであり、輸送に耐えうる充分な強度を有し、尚且つ易剥離性も有していた。しかし、温度９０℃、引張速度３００ｍｍ／ｍｉｎ、サンプル幅１５ｍｍ、１８０度剥離の条件下での剥離強度は次ぎの通りであり、耐殺菌性を有していなかった。
【００３０】
【表１】
【発明の効果】
本発明によれば、食品等の内容物に用いられる包装用シートとして加熱殺菌処理に耐え、層間剥離によって容易に開封することができ、かつ、輸送に耐えうる充分な強度を有した包装シート並びに包装容器を提供できる。
【図面の簡単な説明】
【図１】本発明の包装容器の一例の開封時における熱封着部の断面図である。
【図２】本発明の包装容器の一例を示す斜視図である。
【符号の説明】
ａ ：蓋材フィルム
ａ１：第１層
ａ２：第２層
ａ３：基材フィルム
ｂ ：包装容器底材
ｃ ：内容物
ｄ ：容器の開口鍔部及びヒートシール部[0001]
BACKGROUND OF THE INVENTION
The present invention has an easy-open composite film for packaging used for packaging of foods and the like, and more particularly, has a heat-sealing property and an easy-opening property in a food package subjected to heat sterilization such as boil and semi-retort. The present invention relates to a composite film.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, packaging bodies having strong heat sealing strength that can withstand heat sterilization treatment are widely used for packaging bodies such as foods subjected to heat sterilization treatment such as boiling and retort. However, when such a package is used, a large force is required at the time of opening the lid material, and thus there is an inconvenience in handling that the contents leak or the juice blows out. Therefore, in order to facilitate opening up to now, for example, a laminated film made of a mixture of two or more polyolefins, a laminated film using an ethylene-α olefin copolymer or an ethylene-vinyl acetate copolymer, A technique is known which is used as a lid and can be easily opened at the time of opening. However, the aforementioned easy-open packaging container is easy to rupture during heat sterilization if the openability after heating of the used lid film is easy, or to leak the contents, or to increase the heat seal strength during heating. There were problems such as being unable to open.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a composite film for packaging having heat sealing strength that can withstand heat sterilization as a packaging film used for contents such as food, but can be easily opened, and a packaging container using the film. It is to provide.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have found that polypropylene or a layer mainly composed of a copolymer of propylene and other α-olefin, and a polypropylene having a high melting point of 120 ° C. or higher. By using a composite film with a second layer mainly composed of a mixture of high-density polyethylene or low-density polyethylene on a straight chain, to form a packaging bag, or by using the composite film as a container covering film It has been found that the bursting during heat sterilization and the easy-openability can be improved, and the present invention has been completed.
[0005]
That is, the first configuration of the present invention is an easy-open packaging composite film in which a first layer and a second layer are co-extruded, and the first layer is made of polypropylene or propylene and another α-olefin. It is a heat seal layer containing a resin component (A) having a copolymer , and the second layer is made of 1 to 20% by weight of polypropylene and high-density polyethylene or linear low-density polyethylene 99 to 80 having a melting point of 120 ° C. or higher. It is a composite film for easy-open packaging characterized by containing the resin component (B) which has a mixture with a weight% .
[0006]
Further, the second configuration of the present invention comprises a synthetic resin container bottom and a lid film, and the contents are sealed by heat sealing the lid film on the opening flange of the container bottom. The synthetic resin container bottom material is made of polypropylene or a copolymer of propylene and other α-olefin, or a mixture of polypropylene and other thermoplastic resin, and the lid material film A heat seal comprising a composite film in which the first layer and the second layer are coextrusion laminated, wherein the first layer contains a resin component (A) having a copolymer of polypropylene or propylene and another α-olefin Resin component in which the second layer is a mixture of 1 to 20% by weight of polypropylene and 99 to 80% by weight of high-density polyethylene having a melting point of 120 ° C. or higher or linear low-density polyethylene It is a composite film for easy-open packaging containing (B), wherein the first layer of the lid material film is heat-sealed to the bottom material opening collar in a state where the contents are filled. It is a packaging container.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The composite film for easy-open packaging of the present invention includes a first layer composed of a layer containing a resin component (A) and a second layer composed of a layer containing a resin component (B). It has a layer structure, and the resin component (A) -containing layer and the resin component (B) -containing layer are obtained by a coextrusion method. At this time, the first layer is subjected to heat sealing with another film or the container bottom material opening flange, and the second layer contributes to the delamination strength with the first layer. In addition, the composite film can be used as a composite film composed of only the first layer and the second layer, but it is easy that a base film is further laminated on the second layer. It is preferable from the viewpoint of heat sealing property and easy peelability when an openable packaging bag or an easily openable packaging container is used.
[0008]
The method of laminating the base film on the second layer of the first layer and the second layer coextruded film is not particularly limited, but the thermoplastic resin may be coextruded together with the first layer and the second layer. Further, lamination may be performed using an adhesive, or heat lamination may be applied.
[0009]
The resin component (A) used for the first layer contains polypropylene or a copolymer of propylene and other α-olefin as a main resin component. In the present invention, by using such a resin component (A), in addition to being capable of heat sealing, the sealing property with the synthetic resin container can be remarkably improved, and it has easy opening properties. It will be a thing.
[0010]
Here, the copolymer of propylene and other α-olefins preferably has an α-olefin content of 1 to 10% by weight from the viewpoint of heat sealing properties, sealing properties, and heat resistance.
[0011]
Although the film thickness of such a 1st layer is not specifically limited, It is preferable that it is 0.5-20 micrometers from the point which delamination between a 1st layer and a 2nd layer arises easily.
[0012]
Next, the resin component (B) used for the second layer contains 1 to 20 % by weight of polypropylene and 99 to 80 % by weight of high-density polyethylene having a melting point of 120 ° C. or higher or linear low-density polyethylene. is there. In the present invention, since such a resin is contained in the second layer, co-extrusion with the resin component (A) is possible, and excellent easy peelability can be exhibited.
[0013]
That is, by increasing the polypropylene, the peel strength can be increased and the practical strength can be improved. Moreover, when polyethylene is increased, the easy peeling between layers can be improved.
[0014]
In the present invention, as described above, it is preferable to further provide a base film on the second layer. Specifically, as a method of providing the base film in this case, a urethane adhesive is used. Then, a base material such as a biaxially stretched polyethylene terephthalate film, a biaxially stretched polypropylene film, or KM cellophane may be bonded together, and a thermoplastic resin such as polyethylene is placed on the second layer together with the first layer and the second layer. Co-extrusion may be performed, or polyethylene or the like may be melt-laminated on the second layer, and the base material may be bonded thereon using a urethane-based adhesive.
[0015]
The film thickness of the substrate film varies depending on the application and is not particularly limited. For example, when used as the lid material film of the packaging container of the present invention described in detail below, the film thickness is 20 to 500 μm. Is preferred.
[0016]
The use of the easy-open composite film of the present invention thus obtained is not particularly specified. For example, it can be used as a pillow packaging bag for various food packaging or a lid for food containers. it can. Especially, it is preferable to use as a cover material in the packaging container of this invention explained in full detail below from the point which the effect of this invention becomes remarkable. In any application, it is important to use the first layer so that the first layer is surely heat sealed or heat sealed.
[0017]
Next, the packaging container of this invention is explained in full detail. The packaging container of the present invention comprises a synthetic resin container bottom material and a lid material film, and the contents can be hermetically sealed by heat sealing the lid material film on the opening flange of the container bottom material. The synthetic resin container bottom material is made of polypropylene or a copolymer of propylene and other α-olefin, or a mixture of polypropylene and other thermoplastic resin, and the lid material film is the first layer. And the second layer is a composite film obtained by coextrusion lamination, wherein the first layer contains a resin component (A) having a copolymer of polypropylene or propylene and another α-olefin, and the second layer is An easy-open packaging composite film containing a resin component (B) having a mixture of polypropylene and a high-density polyethylene having a melting point of 120 ° C. or higher or a linear low-density polyethylene. The packaging container is characterized in that the first layer of the film is heat-sealed to the bottom material opening collar in a state where the contents are filled.
[0018]
Here, although it does not specifically limit as a lid | cover material film, For example, the above-mentioned easily openable composite film of this invention can be used preferably. Also, as the polyethylene of the resin mixture (B) constituting the film, it is easy to adjust heat resistance, easy peelability, and practical strength by using high-density polyethylene or linear low-density polyethylene having a melting point of 120 ° C. or higher. It is preferable from the point which becomes. Moreover, it is preferable from the point of performance, such as heat sealing property, easy peelability, and intensity | strength, that a cover material film has a base film. In this case, the film thickness of the first layer is 0.5 to 10 μm, the film thickness of the second layer is 0.5 to 100 μm, and the film thickness of the base film is 20 to 500 μm. Is preferred.
[0019]
Further, as described above, the synthetic resin container bottom material is composed of polypropylene, a copolymer of propylene and other α-olefins, or a mixture of polypropylene and other thermoplastic resins. In this invention, it is preferable that it is the same kind of resin as the 1st layer of a lid | cover material film from the point of heat sealing property.
[0020]
Here, the synthetic resin container bottom material refers to a deep-drawn container-like molded body having an opening portion on the upper surface and a flange on the periphery of the opening portion, for example, b in FIG. This is the part indicated by
[0021]
An example of such a packaging container of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a heat seal portion of the packaging container according to the present invention, a is a lid material film, and b is a packaging container bottom material. , D is an opening flange of the container bottom material and is a heat sealing part. Further, in the lid material film a, a1 is the first layer, a2 is the second layer, and a3 is the base film, and at the time of opening, delamination between the first layer and the second layer as shown in FIG. Will occur. Moreover, the packaging container of the present invention filled with contents such as food is as shown in the perspective view of FIG.
[0022]
In order to manufacture such a packaging container, the manufacturing method is not particularly specified. For example, a method of heat sealing a lid material film after filling the contents of the container bottom material may be mentioned.
[0023]
The heat sealing condition is not particularly limited, but the first layer of the lid material film and the sealing layer of the deep-sealed container bottom material opening collar are bonded together, pressure 0.1-4 MPa, temperature 120-250 ° C., time 0 It is preferable to heat seal under the condition of 2 to 5 seconds.
[0024]
The packaging container of the present invention obtained by heat sealing in this way has sufficient strength at the time of heat sterilization and can be opened very easily by delamination of the first layer and the second layer at the time of opening. Can do.
[0025]
Further, the content sealed in the container by heat sealing is not particularly limited, but the effect of the present invention is remarkable that it is subjected to heat sterilization treatment such as boil and semi-retort. This is preferable.
[0026]
In addition, the packaging container of the present invention has a reliable heat sealing property between the first layer of the lid material film and the bottom of the container base material, and is a stable peeling because it is a delamination between the first layer and the second layer when opened. Strength is obtained. In addition, since the second layer of the lid material film uses polypropylene and a high-density polyethylene having a melting point of 120 ° C. or higher or a linear low-density polyethylene, there is little decrease in heat sealing strength during sterilization. EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
[0027]
【Example】
Example 1
A first layer 1 having a thickness of 3 μm made of a propylene-ethylene copolymer (ethylene content 6% by weight, density 0.90 g / cm 3, melt index 7) and polypropylene (density 0.91 g / cm 3, melt index 10) And a linear low density polyethylene (density 0.94 g / cm 3, melt index 3, melting point 122 ° C.), the second layer 2 having a thickness of 3 μm with a mixing ratio of 20:80 wt%, A co-extruded three-layer film having a third layer 3 having a film thickness of 24 μm made of density polyethylene (density 0.95 g / cm 3, melt index 8) is produced as a synthetic resin lid for heat-sterilized food packaging. This film is cooked using a packaging machine, the first layer and the sealing layer mainly composed of polypropylene as the bottom material are brought into contact with each other, and the temperatures are 160 ° C., 170 ° C., 180 ° C., pressure 0.2 MPa, time Heat seal under conditions of 0.5 seconds. When this package was sterilized by heating at 120 ° C. and opened after cooling, it could be opened cleanly as shown in FIG. 1 without tearing the film. The peel strength under the conditions of a temperature of 120 ° C., a tensile speed of 300 mm / min, a sample width of 15 mm, and a 180 ° peel was as follows, and had sufficient strength to withstand sterilization. Table 1 shows the peel strength under the conditions of a temperature of 23 ° C., a tensile speed of 300 mm / min, a sample width of 15 mm, and a 180 ° peel. Excellent openability was exhibited.
[0028]
Example 2
First layer 1 made of polypropylene (density 0.91 g / cm 3, melt index 8) with a thickness of 5 μm, propylene-ethylene copolymer (density 0.91 g / cm 3, melt index 2, melting point 142 ° C.) and ethylene-hexene 1 copolymer (density 0.94 g / cm 3, melt index 6, melting point 121 ° C.), and a mixing ratio of 10 μm and a second layer 2 having a film thickness of 25 μm and a film thickness of 30 μm. An extruded two-layer film is produced and laminated with biaxially stretched polyethylene terephthalate using a urethane-based adhesive to obtain a synthetic resin lid for heat-sterilized food. This film is cooked using a packaging machine, the first layer and the sealing layer mainly composed of polypropylene as the bottom material are brought into contact with each other, and the temperatures are 160 ° C., 170 ° C., 180 ° C., pressure 0.2 MPa, time Heat seal under conditions of 0.5 seconds. When this package was subjected to heat sterilization at 95 ° C., it was not ruptured from the heat-sealed portion, and when opened after cooling, the film could be opened cleanly as shown in FIG. 1 without tearing. The peel strength under the conditions of a temperature of 95 ° C., a tensile speed of 300 mm / min, a sample width of 15 mm, and a 180 ° peel was as follows, and had a sufficient strength to withstand sterilization. Table 1 shows the peel strength under conditions of a temperature of 23 ° C., a tensile speed of 300 mm / min, a sample width of 15 mm, and a 180 ° C. peel. It was easy to open.
[0029]
Comparative Example 1
First layer 1 made of polypropylene (density 0.90 g / cm 3, melt index 5) with a thickness of 5 μm, polypropylene (density 0.90 g / cm 3, melt index 7, melting point 138 ° C.) and low density polyethylene (density 0.90 g) / Cm 3, melt index 2 and melting point 105 ° C.), comprising a second layer having a thickness of 5 μm with a mixing ratio of 15: 75% by weight and polypropylene (density 0.90 g / cm 3, melt index 6). A co-extruded three-layer film having a third layer 3 having a thickness of 20 μm is produced and used as a synthetic resin lid for heat-sterilized food. Using the side dish of the contents of this film using a packaging machine, the first layer and the sealing layer mainly composed of polypropylene as the bottom material are brought into contact with each other, and the temperatures are 160 ° C., 170 ° C., 180 ° C., pressure 0.2 MPa, time Heat seal under conditions of 0.5 seconds. When this package was heat sterilized at 90 ° C., the heat sealing part was torn and the contents leaked. The peel strength under the conditions of a temperature of 23 ° C., a tensile speed of 300 mm / min, a sample width of 15 mm, and a 180-degree peel is as follows, has sufficient strength to withstand transportation, and has easy peelability. It was. However, the peel strength under the conditions of a temperature of 90 ° C., a tensile speed of 300 mm / min, a sample width of 15 mm, and a 180-degree peel was as follows and did not have bactericidal resistance.
[0030]
[Table 1]
【The invention's effect】
According to the present invention, a packaging sheet that can withstand heat sterilization as a packaging sheet used for contents such as food, can be easily opened by delamination, and has sufficient strength to withstand transportation, and A packaging container can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a heat sealing part when an example of a packaging container of the present invention is opened.
FIG. 2 is a perspective view showing an example of a packaging container according to the present invention.
[Explanation of symbols]
a: Lid material film a1: 1st layer a2: 2nd layer a3: Base film b: Packaging container bottom material c: Contents d: Opening collar part and heat seal part of container
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2000129729A JP3867474B2 (en) | 2000-04-28 | 2000-04-28 | Easy-open composite film and packaging container |
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| JP2000129729A JP3867474B2 (en) | 2000-04-28 | 2000-04-28 | Easy-open composite film and packaging container |
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Cited By (1)
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| CN105579231A (en) * | 2013-09-27 | 2016-05-11 | Dic株式会社 | Antifogging multilayer film, laminate using same, and packaging material |
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| JP5256984B2 (en) * | 2008-10-15 | 2013-08-07 | 住友ベークライト株式会社 | Coextrusion multilayer film |
| JP5737560B2 (en) * | 2011-01-14 | 2015-06-17 | Dic株式会社 | Easy-open coextruded multilayer film and package using the same |
| CN105593017B (en) * | 2013-09-27 | 2018-03-27 | Dic株式会社 | Anti-fogging multilayer film, laminate and packaging material using same |
| US10099453B2 (en) | 2014-10-20 | 2018-10-16 | Dow Global Tchnologies LLC | Multilayer structure, a film made therefrom and a package formed therefrom |
| JP6477985B2 (en) * | 2016-10-03 | 2019-03-06 | Dic株式会社 | Laminated film, laminated film and packaging container |
| KR102594529B1 (en) * | 2022-12-12 | 2023-10-26 | (주)퓨어테크 피앤티 | Detachable guard for freeze drying and method for manufacturing thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105579231A (en) * | 2013-09-27 | 2016-05-11 | Dic株式会社 | Antifogging multilayer film, laminate using same, and packaging material |
| CN105579231B (en) * | 2013-09-27 | 2017-10-03 | Dic株式会社 | Anti-fog properties multilayer film, layered product and packing timber using it |
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