JPH0624467A - Easily opening sealed vessel - Google Patents
Easily opening sealed vesselInfo
- Publication number
- JPH0624467A JPH0624467A JP19911892A JP19911892A JPH0624467A JP H0624467 A JPH0624467 A JP H0624467A JP 19911892 A JP19911892 A JP 19911892A JP 19911892 A JP19911892 A JP 19911892A JP H0624467 A JPH0624467 A JP H0624467A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- seal layer
- seal
- container
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Packages (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、フランジ部を有するプ
ラスチック製のカップ体と蓋材からなる容器において、
優れた密封性ならびにイージーオープン性を備える易開
封性密封容器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container composed of a plastic cup body having a flange portion and a lid member,
The present invention relates to an easily openable sealed container having excellent sealing property and easy open property.
【０００２】[0002]
【従来の技術】各種の食品類を包装するための容器とし
て、蓋が容易に開封できるイージーオープン構造のプラ
スチック製密封容器が汎用されている。従来から実用さ
れている最も一般的なプラスチック製密封容器のイージ
ーオープン構造は、蓋材を構成するシール層の樹脂材質
を変えて容器とのシール強度を適度の範囲（通常は６０
０〜１０００ｇ／２５mm巾）に調整し、蓋材と容器のシ
ール界面をピールして開封するものである（界面剥離タ
イプ）。ところが、界面剥離タイプでは、シール強度が
シール時の条件（温度、圧力、時間、環境条件、内容物
の付着等）に影響を受け易く、強弱のバラツキを生じ易
い。このバラツキは、弱い方に偏ると時にシール漏れの
危険性を増し、逆に強い方に偏るとピール性が減退して
容易に開封できなくなる。とくにシール漏れは密封容器
として致命的な欠陥となる関係で、一般にシール温度や
圧力を高めに設定する条件が採用されており、このため
開封性が犠牲になることが多い。2. Description of the Related Art As a container for packaging various kinds of foods, a plastic sealed container having an easy-open structure whose lid can be easily opened is widely used. The most general easy-open structure of a plastic sealed container that has been put into practical use has been to change the resin material of the sealing layer that constitutes the lid material so that the sealing strength with the container is within an appropriate range (usually 60
The width is adjusted to 0 to 1000 g / 25 mm width) and the sealing interface between the lid material and the container is peeled to open (interfacial peeling type). However, in the interfacial peeling type, the sealing strength is easily affected by the sealing conditions (temperature, pressure, time, environmental conditions, adhesion of contents, etc.), and variations in strength are likely to occur. If this variation is biased toward the weak side, the risk of seal leakage sometimes increases, while if it is biased toward the strong side, the peeling property decreases and it becomes difficult to open the seal. In particular, since seal leakage is a fatal defect in a hermetically sealed container, conditions for setting a high seal temperature and pressure are generally adopted, and thus the openability is often sacrificed.
【０００３】このような問題点を改善するための方策と
して、シール層とそれに隣接する層とのデラミネーショ
ンを利用した層間剥離機構の包装フィルム（特公昭５０
−３７５９８号公報）が知られている。この層間剥離タ
イプではピール強度がシール条件に影響されないため一
定の力で開封することが可能となるが、シール層の破断
が開封終了希望点で行えないと内容物を取り出し難いと
いう欠点がある。特開昭６２−２５１３６３号公報には
容器本体のシール層を剥離する形式のイージーピール性
付与容器において、フランジ内縁部に環状の切り込みを
設けて開封終了希望点でのシール層の破断を容易にする
提案がなされている。しかし、この方法においては切り
込み部より内縁にシールがなされると開封され難く、ま
た切り込み部とシール部分最内縁部が近すぎると内圧を
受けた場合に容易にシール漏れが生じるという問題があ
る。したがって、シール時に切り込み部分から離れた位
置でシールをおこなう必要があり、シール設備に精度が
要求されたり、必要以上に広い容器本体のフランジ部面
積をとらねばならないなど制約条件が多くなる問題があ
る。この点を改善するために、シール盤の形状を工夫し
て、余りシール精度を必要とせずにシール層の破断をお
こなう方法も提案されているが、シール層が厚くなり過
ぎると破断に困難性を伴うなど実用性の面で問題が多
い。As a measure for improving such problems, a packaging film having a delamination mechanism utilizing delamination between a seal layer and a layer adjacent thereto (Japanese Patent Publication No. Sho 50).
No. 37598). In this delamination type, the peel strength is not affected by the sealing conditions, so that it is possible to open with a constant force, but there is a drawback that it is difficult to take out the contents unless the seal layer is broken at the desired end point of opening. Japanese Patent Application Laid-Open No. 62-251363 discloses an easy peeling type container in which a seal layer of a container body is peeled off, and an annular cut is provided at an inner edge portion of a flange to easily break the seal layer at a desired end point of opening. A proposal has been made to do so. However, in this method, there is a problem that if the inner edge is sealed from the notch, it is difficult to open the seal, and if the notch and the innermost edge of the seal portion are too close to each other, a seal leak easily occurs when an internal pressure is applied. Therefore, it is necessary to perform the sealing at a position away from the cut portion at the time of sealing, and there are problems that there are many constraint conditions such as accuracy is required for the sealing equipment and an unnecessarily wide flange area of the container body is required. . In order to improve this point, a method of devising the shape of the sealing board to break the seal layer without requiring excessive sealing accuracy has been proposed, but it is difficult to break if the seal layer becomes too thick. There are many problems in terms of practicality, such as with.
【０００４】本発明者らは、これらの手段とは異なる開
封機構として、フランジ部のシール層全面もしくは一部
の周面に無数の微小凹部を形成した容器本体に、シール
層面と蓋材間のシール強度が容器本体のシール層と隣接
層のラミネート強度以上になる状態に蓋材を接着したシ
ール構造を備える易開封性密封容器を開発した（特開平
３−２００５６０号公報）。この機構によると、シール
盤の位置精度が悪くても容易にシールならびに破断が可
能となるため生産性と利用性を向上させることができ
る。As an unsealing mechanism different from these means, the inventors of the present invention provided a container main body having innumerable minute recesses formed on the entire surface or a part of the peripheral surface of the seal layer of the flange portion, between the seal layer surface and the lid member. An easily openable sealed container having a seal structure in which a lid member is adhered in a state in which the seal strength is equal to or higher than the laminate strength of the seal layer of the container body and the adjacent layer has been developed (JP-A-3-200560). According to this mechanism, it is possible to easily seal and break even if the position accuracy of the sealing board is poor, so that productivity and usability can be improved.
【０００５】[0005]
【発明が解決しようとする課題】ところが、前記の構造
では容器フランジ部のシール層全面に蓋材のシーラント
層を接着しているため耐内圧性が相対的に低下する傾向
がある。However, in the above structure, since the sealant layer of the lid material is adhered to the entire seal layer of the container flange portion, the internal pressure resistance tends to be relatively lowered.
【０００６】本発明は、このような問題点を解消するた
めにシール構造の改良を図ったもので、その目的は、優
れたシール安定性とイージーオープン性とを兼備し、か
つシール操作性に優れた易開封性密封容器を提供するこ
とにある。The present invention aims to improve the seal structure in order to solve such problems, and its purpose is to combine excellent seal stability and easy-open property and to improve seal operability. An object is to provide an excellent easily openable sealed container.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めの本発明による易開封性密封容器は、シール層と該シ
ール層に隣接する隣接層のラミネート強度が３００〜２
０００ｇ／２５mmである２層以上の多層シートからな
り、フランジ部のシール層の厚みが１０〜８０μである
容器本体と蓋材とをシールした構造の容器において、前
記シール層の内縁部分の全面もしくは前記シール層の初
期開封部位に相当する内縁部分の一部にフランジ巾の１
／２以下の範囲内で微小凹部を形成し、前記微小凹部の
外端に沿ってフランジ部に溝部を形成し、該微小凹部お
よび溝部を除いて容器本体のフランジ部と蓋材間を容器
本体のシール層と隣接層のラミネート強度より高い接着
強度にシールしてなることを構成上の特徴とする。In order to achieve the above object, an easily openable sealed container according to the present invention has a laminate strength of 300 to 2 between a seal layer and an adjacent layer adjacent to the seal layer.
A container having a structure in which a container body and a lid member, each of which is composed of a multilayer sheet of two or more layers of 000 g / 25 mm and has a thickness of a seal layer of a flange portion of 10 to 80 μ, is sealed, One part of the flange width is provided on a part of the inner edge portion corresponding to the initial opening portion of the sealing layer.
/ 2 or less, a minute concave portion is formed, a groove portion is formed along the outer end of the minute concave portion, and a groove portion is formed along the outer edge of the minute concave portion. The structural feature is that the seal layer is sealed with an adhesive strength higher than the laminating strength between the seal layer and the adjacent layer.
【０００８】図１は本発明に係る易開封性密封容器の全
体を示した断面図で、１はフランジ部２を備えた容器本
体、３は蓋材である。容器本体１は、シール層４とそれ
に隣接する隣接層５を有する多層シートからなってい
る。容器本体１を構成する多層シートの樹脂材質は、任
意のものが用いられる。例えばシール層４にはヒートシ
ールが可能な熱可塑性樹脂を用いることができ、ポリエ
チレン、ポリプロピレン、ポリエチレンテレフタレー
ト、ポリスチレン、ポリカーボネート、酢酸ビニル共重
合体、アイオノマー、ポリビニルアルコール共重合体、
ポリアミド、塩化ビニル共重合体などの各種単体樹脂の
ほか、これらの樹脂を任意に数種配合したものや各樹脂
を不飽和カルボン酸等で処理したものを用いることがで
きる。隣接層５についても、シール層４とのラミネート
強度が３００〜２０００ｇ／２５mmの範囲であれば任意
の樹脂を用いることができる。組合せの例としては、ポ
リエチレンがシール層４である場合に、隣接層５として
ポリプロピレン、ポリプロピレンとポリエチレンの混合
物、ポリプロピレン−ポリエチレン共重合体、ポリエチ
レン不飽和カルボン酸処理樹脂等を任意に選択すること
ができる。FIG. 1 is a cross-sectional view showing the entire easily-openable hermetically sealed container according to the present invention, in which 1 is a container body having a flange portion 2 and 3 is a lid member. The container body 1 is composed of a multilayer sheet having a seal layer 4 and an adjacent layer 5 adjacent to the seal layer 4. Any resin material may be used as the resin material of the multilayer sheet forming the container body 1. For example, a heat-sealable thermoplastic resin can be used for the seal layer 4, and polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polycarbonate, vinyl acetate copolymer, ionomer, polyvinyl alcohol copolymer,
In addition to various simple resins such as polyamide and vinyl chloride copolymer, it is possible to use a mixture of any of these resins or a mixture of each resin treated with an unsaturated carboxylic acid. Also for the adjacent layer 5, any resin can be used as long as the laminating strength with the seal layer 4 is in the range of 300 to 2000 g / 25 mm. As an example of the combination, when polyethylene is the seal layer 4, polypropylene, a mixture of polypropylene and polyethylene, a polypropylene-polyethylene copolymer, a polyethylene unsaturated carboxylic acid treatment resin, or the like can be arbitrarily selected as the adjacent layer 5. it can.
【０００９】この多層シートは２層に限らず他の機能を
もたせた２層以上として構成することができる。例え
ば、容器に保存性を持たせるために上記２層の外側にバ
リア層としてエチレンビニルアルコール共重合体や塩化
ビニリデン共重合体を配置したり、強度向上や水蒸気バ
リアを目的とした外層として更にポリプロピレン等を積
層してもよく、これらの層間を強固に接着するために各
種の接着剤を使用しても良い。The multi-layer sheet is not limited to two layers, but can be formed as two or more layers having other functions. For example, an ethylene vinyl alcohol copolymer or a vinylidene chloride copolymer may be disposed as a barrier layer on the outside of the above two layers in order to provide the container with storage stability, and polypropylene may be further used as an outer layer for the purpose of improving strength and a water vapor barrier. Etc. may be laminated, and various adhesives may be used to firmly bond these layers.
【００１０】多層シートを作製するためには種々の方法
が用いられるが、共押出法、ドライラミネート法、共押
出ラミネート法、サーマルラミネート法等が代表的であ
る。なお、隣接する層としてはプラスチックに限らず任
意の金属層も用いることができるし、またこれらの金属
層は他の機能層としても使用することができる。Various methods are used for producing a multilayer sheet, but a coextrusion method, a dry laminating method, a coextrusion laminating method, a thermal laminating method and the like are typical. The adjacent layers are not limited to plastic, and any metal layer can be used, and these metal layers can also be used as other functional layers.
【００１１】本発明において、シール層４と隣接層５の
ラミネート強度を３００〜２０００ｇ／２５mmとし、フ
ランジ部のシール層４の厚みを１０〜８０μに設定する
理由は、前記ラミネート強度が３００ｇ／２５mmを下廻
り、シート層の厚みが１０μ未満であると十分な密封性
を確保することができず、他方、ラミネート強度が２０
００ｇ／２５mmを越え、シール層厚さが８０μを上廻る
と開封時の剥離抵抗が大きくなって、円滑な開封性が損
なわれるからである。In the present invention, the reason why the laminate strength of the seal layer 4 and the adjacent layer 5 is 300 to 2000 g / 25 mm and the thickness of the seal layer 4 at the flange portion is set to 10 to 80 μ is that the laminate strength is 300 g / 25 mm. When the thickness of the sheet layer is less than 10 μm, sufficient sealing performance cannot be secured, and on the other hand, the laminating strength is 20
This is because if it exceeds 00 g / 25 mm and the thickness of the seal layer exceeds 80 μ, peeling resistance at the time of opening becomes large and smooth opening property is impaired.
【００１２】蓋材３には、フランジ部のシール層４とシ
ール可能なものであれば任意の樹脂フイルムを用いるこ
とができるが、とくにシール層４と強固に密着する材質
のシーラント層６を有することが好ましい。多層構成の
蓋材としては、例えばシーラント層６がポリカーボネー
ト、ポリエチレン、ポリプロピレンで補強層がナイロン
の２層フィルムや、ヒートシール性ポリエチレンテレフ
タレートからなるシーラント層６にバリア層としてアル
ミニウム箔、最外層としてポリエチレンテレフタレート
を配した３層の組合せ等が挙げられる。また、蓋体３は
フィルム形状に限らず、成形品形態のものも用いられ
る。例えばシーラント層６がヒートシール性ポリエチレ
ンテレフタレートであり、バリア層にエチレンビニルア
ルコール共重合体、外層をポリプロピレンとした多層シ
ートを真空成形により、落とし蓋形状に成形して用いる
ことも可能である。As the lid member 3, any resin film can be used as long as it can seal with the seal layer 4 of the flange portion, but in particular, it has a sealant layer 6 of a material that firmly adheres to the seal layer 4. It is preferable. Examples of the multi-layered lid material include a two-layer film in which the sealant layer 6 is polycarbonate, polyethylene, or polypropylene and the reinforcing layer is nylon, a sealant layer 6 made of heat-sealable polyethylene terephthalate, an aluminum foil as a barrier layer, and a polyethylene as an outermost layer. A combination of three layers in which terephthalate is arranged may be mentioned. Further, the lid body 3 is not limited to the film shape, and a molded article form may be used. For example, the sealant layer 6 is a heat-sealable polyethylene terephthalate, and a multilayer sheet having an ethylene vinyl alcohol copolymer as the barrier layer and polypropylene as the outer layer can be formed into a drop lid shape by vacuum forming and used.
【００１３】容器本体１のフランジ部２には、図２（蓋
材を一部開口した容器の平面図）に示したようにシール
層４の内縁部分にフランジ巾Ｗの１／２以下の範囲内
で、その内縁周方向に沿う形態で微小凹部７が形成され
ている。この微小凹部７の形成範囲がフランジ巾Ｗの１
／２を越えると、十分な耐内圧性を確保することができ
なくなる。微小凹部７の形成位置は、図２のようにシー
ル層４の内縁部分の全面、もしくは図３（容器の平面
図）に示すようにシール層４の初期開封部位に相当する
内縁部分の一部とする。微小凹部７を一部形成する後者
の場合には、十分な耐内圧性を確保するため、微小凹部
７の長さ(l) をフランジ内縁（Ｌ）周長の１／５以下、
好ましくは１／１０以下に設定することが好ましい。In the flange portion 2 of the container body 1, as shown in FIG. 2 (a plan view of the container in which the lid member is partially opened), the inner edge portion of the seal layer 4 has a range of 1/2 or less of the flange width W. Inside, the minute recesses 7 are formed along the inner peripheral direction. The formation range of the minute recess 7 is 1 of the flange width W.
If it exceeds / 2, sufficient internal pressure resistance cannot be ensured. The formation position of the minute concave portion 7 is the entire surface of the inner edge portion of the seal layer 4 as shown in FIG. 2 or a part of the inner edge portion of the seal layer 4 corresponding to the initial opening portion as shown in FIG. 3 (plan view of the container). And In the latter case where a part of the minute recess 7 is formed, in order to secure sufficient internal pressure resistance, the length (l) of the minute recess 7 is set to 1/5 or less of the flange inner edge (L) circumference,
It is preferably set to 1/10 or less.
【００１４】微小凹部７の形成は、例えば超音波処理、
加熱もしくは冷間プレス、高周波を利用した加圧など適
宜な方法でおこなうことができる。このうち、凸形状の
超音波ホーンを用いて超音波処理する形成方法は、均等
で微細な無数の凹状パターンを形成できるため最も有効
である。しかし、形成する微小凹部７の数はとくに限定
されるものではない。The minute recesses 7 are formed by ultrasonic treatment, for example.
It can be carried out by an appropriate method such as heating or cold pressing, pressurization using high frequency. Among these, the forming method in which ultrasonic processing is performed using a convex ultrasonic horn is most effective because it is possible to form an infinite number of uniform and minute concave patterns. However, the number of minute recesses 7 to be formed is not particularly limited.
【００１５】シール層４の内縁部分に形成された微小凹
部７の外側には、図１、図２および図３に符号８で示し
たようにその外端に沿ってフランジ面に溝部が形成され
る。該溝部８の形成は、微小凹部７がシール層４の内縁
部分の全面に形成される場合にはその外端に沿う周囲全
面に、また微小凹部７がシール層４の初期開封部位に相
当する内縁部分の一部に形成される場合にはその外端の
長さに形成される。また溝部の巾および深さは耐内圧性
を阻害しない範囲、好ましくは巾１〜２mm、深さ０．２
〜１mmに設定し、容器本体の成形と同時に形成するか、
加熱もしくは冷間プレスあるいは高周波加圧などの手段
を用いて微小凹部７の形成と同時もしくは後工程として
形成する等、種々の方法で形成することができる。On the outside of the minute recess 7 formed in the inner edge portion of the seal layer 4, a groove portion is formed on the flange surface along the outer end thereof as indicated by reference numeral 8 in FIGS. 1, 2 and 3. It The formation of the groove portion 8 corresponds to the entire peripheral surface along the outer edge of the seal layer 4 when the minute recess portion 7 is formed on the entire inner edge portion, and the minute recess portion 7 corresponds to the initial opening portion of the seal layer 4. When formed on a part of the inner edge portion, it is formed on the length of the outer end thereof. The width and depth of the groove are within a range that does not impair internal pressure resistance, preferably 1-2 mm in width and 0.2 in depth.
Set to ~ 1mm and form at the same time as molding the container body,
It can be formed by various methods, such as forming at the same time as the formation of the minute concave portions 7 or as a post-process using a means such as heating or cold pressing or high frequency pressurization.
【００１６】容器本体１のフランジ部２と蓋材３は、最
終的に相互のシール層４とシーラント層６を重ね合わせ
て接着するが、シール構造として微小凹部７および溝部
８を除いて容器フランジのシール層４と隣接層５のラミ
ネート強度より高い接着強度にシールされる。微小凹部
７を含めて全面をシールした場合には、耐内圧性が不十
分となって密封性の低下を招く。接着方法としては、公
知のヒートシール法、超音波シール法、高周波シール法
等が用いられる。The flange portion 2 and the lid member 3 of the container body 1 are finally laminated and adhered to each other with the sealing layer 4 and the sealant layer 6, but as a sealing structure, the container flange is excluded except for the minute concave portions 7 and the groove portions 8. The adhesive strength is higher than the laminating strength between the seal layer 4 and the adjacent layer 5. If the entire surface including the minute recesses 7 is sealed, the internal pressure resistance becomes insufficient and the hermeticity deteriorates. As a bonding method, a known heat sealing method, ultrasonic sealing method, high frequency sealing method, or the like is used.
【００１７】図４は、本発明による易開封性密封容器の
シール後におけるフランジ部分を拡大した部分断面図
で、９は微小凹部７および溝部８を除いて接着されたシ
ール部分である。このほか、微小凹部７を形成したフラ
ンジ部分をシール部分９より若干低い段差を付けて構成
する構造も本発明の容器態様に含まれる。また、本発明
の対象となる容器形状は、図２に示した丸型容器に限ら
ず、四角型、三角型あるいはこれらを連結したような多
様なタイプに利用することができる。FIG. 4 is an enlarged partial cross-sectional view of the flange portion of the easily-openable hermetically sealed container according to the present invention after being sealed. Reference numeral 9 denotes a seal portion which is adhered except for the minute concave portion 7 and the groove portion 8. In addition, a structure in which the flange portion in which the minute recess 7 is formed has a step slightly lower than the seal portion 9 is also included in the container aspect of the present invention. Further, the shape of the container to which the present invention is applied is not limited to the round container shown in FIG. 2, but may be a square container, a triangular container, or various types in which these containers are connected.
【００１８】[0018]
【作用】本発明による易開封性密閉容器の構造によれ
ば、微小凹部７の外端に沿ってフランジ面に溝部８が形
成されているから、容器本体１のフランジ部２と蓋材３
をシールする際にシール盤が多少ずれても溝部８が逃げ
をカバーして微小凹部７の部分まで含めてシールされる
事態が避けられ、正確な位置調整が不要となる。この作
用で、常に操作性よく微小凹部を除いてシール層４とシ
ーラント層６をシールすることが可能となり、耐内圧性
を損なうことがなくなる。According to the structure of the easily openable closed container according to the present invention, since the groove portion 8 is formed on the flange surface along the outer end of the minute concave portion 7, the flange portion 2 of the container body 1 and the lid member 3 are formed.
Even if the sealing plate is slightly displaced when sealing the sheet, it is possible to avoid the situation in which the groove 8 covers the escape and seals up to the minute concave portion 7, and accurate position adjustment is unnecessary. By this action, it becomes possible to always seal the seal layer 4 and the sealant layer 6 with good operability except for the minute recesses, and the internal pressure resistance is not impaired.
【００１９】本発明に係る易開封性密閉容器は、次のよ
うにして開封される。まず蓋材の初期開封部片を上方に
引っ張り上げると、図５に示すようにフランジ部２のシ
ール層４と隣接層５の界面で剥離が進行する。この剥離
状態は溝部８の形成部分を過ぎ微小凹部７の外縁端部ま
で続くが、この点に至るとシール層４の引っ張り破壊力
が弱化した破壊部分10で容易にカットされる。このよう
に本発明のシール構造ではシール層４の内縁部分の全面
もしくはシール層４の初期開封部位に相当する内縁部分
の一部にフランジ巾の１／２以下の範囲内で形成した微
小凹部７がシールされていないから、密封時の優れた耐
内圧性を保持しながら開封時の円滑な開封性が付与され
るという両立効果がもたらされる。The easily openable closed container according to the present invention is opened as follows. First, when the initial opening portion of the lid member is pulled upward, peeling proceeds at the interface between the seal layer 4 of the flange portion 2 and the adjacent layer 5 as shown in FIG. This peeled state continues past the formation portion of the groove portion 8 to the outer edge portion of the minute concave portion 7, but at this point, the tensile fracture strength of the seal layer 4 is easily cut at the destroyed portion 10. As described above, in the seal structure of the present invention, the minute recesses 7 formed within the entire area of the inner edge portion of the seal layer 4 or a part of the inner edge portion corresponding to the initial opening portion of the seal layer 4 within the range of 1/2 or less of the flange width. Since it is not sealed, there is a compatibility effect that a smooth opening property is imparted at the time of opening while maintaining excellent internal pressure resistance at the time of sealing.
【００２０】[0020]
【実施例】以下、本発明の実施例を比較例と対比して説
明する。EXAMPLES Examples of the present invention will be described below in comparison with comparative examples.
【００２１】実施例１〜２、比較例１〜２ 全体の厚さが８５０μで、シール層の材質が密度0.955
、メルトインデックス(MI)５g/10min の高密度ポリエ
チレン(HDPE)、隣接層（外層を兼ねる）がメルトインデ
ックス(MI)0.5g/minのポリプロピレン(PP)からなる２層
シートを共押出して作製した。ついで、このシートを真
空成形し、内径６５mm、フランジ巾１０mm、高さ２５mm
の容器本体を形成した。得られた容器本体のシール層の
厚さは２０μ、シール層と隣接層とのラミネート強度は
１５００g ／２５mmであった。Examples 1 and 2, Comparative Examples 1 and 2 The total thickness is 850 μm, and the material of the sealing layer is 0.955.
, A high-density polyethylene (HDPE) having a melt index (MI) of 5 g / 10 min, and a polypropylene (PP) having a melt index (MI) of 0.5 g / min as an adjacent layer (also serving as an outer layer) were coextruded to prepare the sheet. . Then, this sheet is vacuum formed to have an inner diameter of 65 mm, a flange width of 10 mm, and a height of 25 mm.
The container body was formed. The thickness of the seal layer of the obtained container body was 20 μ, and the laminating strength between the seal layer and the adjacent layer was 1500 g / 25 mm.
【００２２】ついで、フランジ部のシール層内縁部分の
全面に突起数が２５６個／cm2 の微小突起状超音波ホー
ンを当てて超音波処理をおこない、フランジ巾の１／２
および１／３の形成巾を有する無数の微小凹部を形成し
た。この際の超音波処理条件は、出力２KW（使用エネル
ギー；225J) 、加圧力３３８KPa 、時間０．３秒に設定
し、深さ１０μの微小凹部を点状に形成した。Then, an ultrasonic treatment is performed by applying a micro-projection ultrasonic horn having a projection number of 256 pieces / cm 2 to the entire surface of the inner edge portion of the seal layer of the flange portion, and performing ultrasonic treatment to obtain half the flange width.
And countless minute recesses having a formation width of 1/3 were formed. The ultrasonic treatment conditions at this time were set to an output of 2 KW (working energy; 225 J), a pressing force of 338 KPa, and a time of 0.3 seconds, and minute recesses having a depth of 10 μ were formed in dots.
【００２３】ついで、形成した微小凹部の外端に沿う形
状に突起片を有するリングシール盤を用い、面圧１５kg
/cm2、温度１５０℃の条件で巾１mm、深さ０．５mmの溝
部を微小凹部の外端全周に形成した。Then, using a ring sealer having a protruding piece in a shape along the outer end of the formed minute recess, a surface pressure of 15 kg is used.
A groove having a width of 1 mm and a depth of 0.5 mm was formed on the entire circumference of the outer end of the minute recess under the conditions of / cm 2 and temperature of 150 ° C.
【００２４】蓋材には、容器のシール層と同一の樹脂を
用いて厚さ５０μのシーラント層とし、これを延伸した
ポリアミド（厚さ３０μ）をドライラミネートしたもの
を用いた。As the lid member, a sealant layer having a thickness of 50 μ was formed using the same resin as that of the sealing layer of the container, and stretched polyamide (thickness 30 μ) was dry laminated.
【００２５】容器フランジ部のシール層面に蓋材のシー
ラント層を重ね、平シール盤を用いて微小凹部および溝
部を除いた面をヒートシールした。シートシールの条件
は、温度１９０℃、面圧２kg／cm2 、時間１秒とした。The sealant layer of the lid material was placed on the seal layer surface of the container flange portion, and the surface excluding the minute concave portions and groove portions was heat-sealed using a flat sealing plate. The conditions for sheet sealing were a temperature of 190 ° C., a surface pressure of 2 kg / cm 2 , and a time of 1 second.
【００２６】このようにして製造した密封容器の各５０
個につき、容器の密封性能および蓋の開封性（ピール抵
抗感）を試験した。なお、密封性能の試験は、容器に内
容物として水を詰め、蓋材上部から圧縮エアーを漏れの
ないように注入し内部からの平均パンク圧を測定した。
また、同時に開封後のシール面の状態（シール面の微小
凹部へのはみ出し個数）を観察した。比較のために、微
小凹部の外端に溝部を形成しない構造の容器を作製し、
同様に試験した。それらの結果を対比して表１に示し
た。50 each of the hermetically sealed containers thus manufactured
Each piece was tested for the sealing performance of the container and the openability (peel resistance) of the lid. In addition, in the test of sealing performance, water was filled in a container as a content, compressed air was injected from the upper portion of the lid material without leaking, and an average puncture pressure from the inside was measured.
At the same time, the state of the seal surface after opening (the number of protrusions of the seal surface into the minute recesses) was observed. For comparison, a container having a structure in which a groove is not formed on the outer end of the minute recess is manufactured,
It tested similarly. The results are shown in Table 1 in comparison.
【００２７】[0027]
【表１】 [Table 1]
【００２８】実施例３〜４、比較例３〜４ 実施例１と同一材質で構成した容器のフランジ部にシー
ル層の初期開封部位に相当する内縁部分の一部に、巾が
フランジ部の１／２および１／３で、長さが２０mm（フ
ランジ内縁周長の１／１０）になる形状に微小凹部を形
成した。微小凹部の形成は実施例１と同一条件とした。
ついで、微小凹部の外端に沿って同一長さの溝部を実施
例１に準じて形成したのち、実施例１と同様に微小凹部
および溝部を除いて容器フランジのシール層と蓋材のシ
ーラント層をヒートシールした。Examples 3 to 4 and Comparative Examples 3 to 4 In the flange portion of the container made of the same material as that of Example 1, a part of the inner edge portion corresponding to the initial opening portion of the seal layer has a width of the flange portion 1 Minute recesses were formed in a shape having a length of 20 mm (1/10 of the inner peripheral edge length of the flange) at / 2 and 1/3. The formation of minute recesses was performed under the same conditions as in Example 1.
Then, a groove having the same length is formed along the outer edge of the minute recess according to Example 1, and then the sealing layer of the container flange and the sealant layer of the lid material are removed except for the minute recess and the groove as in Example 1. Was heat-sealed.
【００２９】このようにして作製した容器５０個につ
き、実施例１と同様に各種のテストをおこない、結果を
表２に示した。なお、比較のために、微小凹部の外端に
溝部を形成しない構造の容器を作製し、同様にテストし
た結果を表２に併載した。Various tests were carried out on 50 containers thus prepared in the same manner as in Example 1, and the results are shown in Table 2. For comparison, a container having a structure in which no groove is formed at the outer end of the minute recess was prepared, and the same test results were also shown in Table 2.
【００３０】[0030]
【表２】 [Table 2]
【００３１】[0031]
【発明の効果】以上のとおり、本発明によれば優れたシ
ール安定性と円滑な開封性を兼備し、輸送中等に外部衝
撃を受けても内容物が漏れることがない高性能の易開封
性密封容器が提供される。そのうえ、微小凹部の外端に
溝部が形成されているため製造時のシール工程において
正確なシール盤の位置調整をしなくても微小凹部を除い
て正常にシールすることができるから、常に操作性よく
密封容器を量産することができる。As described above, according to the present invention, excellent seal stability and smooth unsealing property are provided, and the contents are not leaked even when an external impact is applied during transportation, and the high-performance easy-opening property is provided. A sealed container is provided. In addition, since the groove is formed at the outer end of the minute recess, normal sealing can be performed without the minute recess without adjusting the position of the sealing plate in the sealing process during manufacturing. Well-sealed containers can be mass-produced.
【図１】本発明の易開封性密封容器の全体を示した断面
図である。FIG. 1 is a cross-sectional view showing the entire easily openable sealed container of the present invention.
【図２】蓋材を一部開口した状態を示した容器の平面図
である。FIG. 2 is a plan view of the container showing a state in which a lid member is partially opened.
【図３】別態様の容器の平面図である。FIG. 3 is a plan view of a container according to another aspect.
【図４】本発明による密封容器のフランジ部分を示した
拡大断面図である。FIG. 4 is an enlarged sectional view showing a flange portion of the sealed container according to the present invention.
【図５】容器の開封状態を模式的に示したフランジ部分
の拡大断面図である。FIG. 5 is an enlarged sectional view of a flange portion schematically showing an opened state of the container.
１ 容器本体 ２ フランジ部 ３ 蓋材 ４ シール層 ５ 隣接層 ６ シーラント層 ７ 微小凹部 ８ 溝部 ９ シール部分 10 破壊部分 1 Container Main Body 2 Flange Part 3 Lid Material 4 Sealing Layer 5 Adjacent Layer 6 Sealant Layer 7 Minute Recesses 8 Groove 9 Sealing Part 10 Breaking Part
Claims (1)
のラミネート強度が３００〜２０００ｇ／２５mmである
２層以上の多層シートからなり、フランジ部のシール層
の厚みが１０〜８０μである容器本体と蓋材とをシール
した構造の容器において、前記シール層の内縁部分の全
面もしくは前記シール層の初期開封部位に相当する内縁
部分の一部にフランジ巾の１／２以下の範囲内で微小凹
部を形成し、前記微小凹部の外端に沿ってフランジ面に
溝部を形成し、該微小凹部および溝部を除いて容器本体
のフランジ部と蓋材間を容器本体のシール層と隣接層の
ラミネート強度より高い接着強度にシールしてなること
を特徴とする易開封性密封容器。1. A container comprising a multi-layer sheet of two or more layers in which a laminate strength of the seal layer and an adjacent layer adjacent to the seal layer is 300 to 2000 g / 25 mm, and a thickness of the seal layer of the flange portion is 10 to 80 μm. In a container having a structure in which a main body and a lid member are sealed, the entire inner edge portion of the seal layer or a part of the inner edge portion corresponding to the initial opening portion of the seal layer is fine within a range of 1/2 or less of the flange width. A recess is formed, a groove is formed on the flange surface along the outer end of the minute recess, and the sealing layer of the container main body and an adjacent layer are laminated between the flange of the container body and the lid material except for the minute recess and the groove. An easily openable sealed container characterized by being sealed with an adhesive strength higher than the strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4199118A JP2994864B2 (en) | 1992-07-02 | 1992-07-02 | Easy-open sealed container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4199118A JP2994864B2 (en) | 1992-07-02 | 1992-07-02 | Easy-open sealed container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0624467A true JPH0624467A (en) | 1994-02-01 |
| JP2994864B2 JP2994864B2 (en) | 1999-12-27 |
Family
ID=16402442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4199118A Expired - Fee Related JP2994864B2 (en) | 1992-07-02 | 1992-07-02 | Easy-open sealed container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2994864B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5613617A (en) * | 1994-09-27 | 1997-03-25 | Da Vitoria Lobo; Luis J. | Sealed container that is easily opened and mass-produced |
| US5819976A (en) * | 1996-11-15 | 1998-10-13 | Alcoa Closure Systems International | Closure having self-venting, sealed promotion compartment |
| JP2009255976A (en) * | 2008-03-25 | 2009-11-05 | Idemitsu Unitech Co Ltd | Packaging container and its manufacturing method and apparatus |
-
1992
- 1992-07-02 JP JP4199118A patent/JP2994864B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5613617A (en) * | 1994-09-27 | 1997-03-25 | Da Vitoria Lobo; Luis J. | Sealed container that is easily opened and mass-produced |
| US5819976A (en) * | 1996-11-15 | 1998-10-13 | Alcoa Closure Systems International | Closure having self-venting, sealed promotion compartment |
| JP2009255976A (en) * | 2008-03-25 | 2009-11-05 | Idemitsu Unitech Co Ltd | Packaging container and its manufacturing method and apparatus |
| JP2013100138A (en) * | 2008-03-25 | 2013-05-23 | Idemitsu Unitech Co Ltd | Container body, packaging container, and method and apparatus for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2994864B2 (en) | 1999-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR930003909B1 (en) | Easily openable sealed container | |
| JP2739994B2 (en) | Manufacturing method of sealed container | |
| JP2739988B2 (en) | Manufacturing method of easily openable sealed container | |
| JP3208007B2 (en) | Easy-open sealed container | |
| JPH11171249A (en) | Easily opening sealed container and manufacture of container main body used for container | |
| JP2633041B2 (en) | Manufacturing method of sealed container | |
| JP2994864B2 (en) | Easy-open sealed container | |
| JP2872738B2 (en) | Easy-open container and manufacturing method thereof | |
| JP2739986B2 (en) | Manufacturing method of sealed container | |
| JP2930643B2 (en) | Manufacturing method of package | |
| JP2984464B2 (en) | Easy-open sealed container | |
| JP2001010658A (en) | Hermetic container and manufacture thereof | |
| JP3040257B2 (en) | Sealed container | |
| JP2997127B2 (en) | Sealed container | |
| JP2672856B2 (en) | Easy-open sealed container | |
| JPH0632371A (en) | Sealed container | |
| JPH11171247A (en) | Easily opening sealed container and manufacture of container main body to be used therefor | |
| JP2659583B2 (en) | Easy-open sealed container | |
| JP3003393B2 (en) | Sealed container | |
| JP3546940B2 (en) | Sealed package | |
| JP2751936B2 (en) | Easy-open sealed container | |
| JP2742085B2 (en) | Easy-open sealed container | |
| JP3126092B2 (en) | Sealed container and its manufacturing method | |
| JP2578229B2 (en) | Manufacturing method of easily openable sealed container | |
| JPH0267125A (en) | Preparation of hermetically sealed container |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 8 Free format text: PAYMENT UNTIL: 20071022 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 9 Free format text: PAYMENT UNTIL: 20081022 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 10 Free format text: PAYMENT UNTIL: 20091022 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091022 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111022 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 12 Free format text: PAYMENT UNTIL: 20111022 |
|
| LAPS | Cancellation because of no payment of annual fees |