JP3194689B2 - Sealed container - Google Patents
Sealed containerInfo
- Publication number
- JP3194689B2 JP3194689B2 JP16842795A JP16842795A JP3194689B2 JP 3194689 B2 JP3194689 B2 JP 3194689B2 JP 16842795 A JP16842795 A JP 16842795A JP 16842795 A JP16842795 A JP 16842795A JP 3194689 B2 JP3194689 B2 JP 3194689B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- flange
- container
- sealing
- seal
- 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.)
- Expired - Fee Related
Links
- 239000004743 Polypropylene Substances 0.000 claims description 59
- 238000007789 sealing Methods 0.000 claims description 52
- 230000032798 delamination Effects 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 22
- -1 polypropylene Polymers 0.000 claims description 20
- 229920001155 polypropylene Polymers 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 155
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 17
- 230000002093 peripheral effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 13
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 13
- 239000000565 sealant Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000452 restraining effect Effects 0.000 description 4
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000005033 polyvinylidene chloride Substances 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- IHCCLXNEEPMSIO-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 IHCCLXNEEPMSIO-UHFFFAOYSA-N 0.000 description 1
- JMMZCWZIJXAGKW-UHFFFAOYSA-N 2-methylpent-2-ene Chemical compound CCC=C(C)C JMMZCWZIJXAGKW-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Landscapes
- Packages (AREA)
- Laminated Bodies (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、食品また飲料等を収納
するための優れた密封性、易開封性、耐熱性とを兼備す
る密封容器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed container for storing foods, beverages and the like, which has excellent sealing properties, easy opening properties and heat resistance.
【０００２】[0002]
【従来の技術】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、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に制
御（例えば６００〜１０００ｇ／２５mm巾）したシール
層を形成し、蓋材と容器の界面をピールして開封するタ
イプのものである。ところが、シール強度はシール条件
（温度、圧力、時間、環境条件、内容物の付着等）の影
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 The easy-open structure of a most commonly used plastic hermetically sealed container, which has been conventionally used, is appropriately controlled in sealing strength with the container by changing the resin material of a sealing layer (for example, 600 to 1000 g / 25 mm width). ), A sealing layer is formed, and the interface between the lid member and the container is peeled and opened. However, the sealing strength is easily affected by the sealing conditions (temperature, pressure, time, environmental conditions, adhesion of contents, etc.), and the strength tends to vary. This variation increases the risk of seal leakage when biased towards the weaker,
Conversely, if it is biased toward the strong side, the peelability will decrease and it will not be easy to open. In particular, since a seal leak is a fatal defect in a sealed container, a condition for setting a higher seal temperature and pressure is generally employed, and therefore, the opening property 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
ンによる開封機構（特開昭50-37598号公報）が知られて
いる。この方法ではピール強度がシール条件に影響され
ないため一定に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った。特開昭６２−２５１３６
３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
れた位置でのシールを行う必要があり、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
部面積を採らねばならないなど制約条件が多くなる欠点
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
を行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 solving such a problem, an opening mechanism by delamination between a seal layer and a layer adjacent to the seal layer (Japanese Patent Laid-Open No. 50-37598) is known. According to this method, since the peel strength is not affected by the sealing conditions, it is possible to open the package with a constant force. However, if the breaking of the sealing layer cannot be performed at the desired point of completion of the opening, there is a drawback that it is difficult to take out the contents. JP-A-62-25136
Japanese Patent Publication No. 3 (1994) discloses a proposal for providing an easy-peeling container of a type in which a seal layer of a container body is peeled off, in which a notch is provided at an inner edge portion of a flange to facilitate breakage of the seal layer at a desired end point of opening. However, in this method, there is a problem that it is difficult to open the seal if the seal is formed on the inner edge from the cut portion, and that if the cut portion and the innermost edge of the seal portion are too close, the seal leaks easily when receiving an internal pressure. Therefore, it is necessary to perform sealing at a position distant from the cut portion during sealing, and there are many disadvantages such as the need for accuracy in the sealing equipment and the need to take an unnecessarily large container flange area. is there. In order to improve this point, a method has been proposed in which the shape of the sealing plate is devised to break the seal layer without requiring much sealing accuracy. However, if the seal layer becomes too thick, it is difficult to break. There are many problems in terms of practicality such as
【０００４】これらの手段とは異なる開封機構として、
容器本体フランジ部の全面または一部の面に微小凹部を
形成させた易開封性密封容器が本出願人によって開発さ
れている（特開平３−200561号公報、特開平３−226406
号公報、特開平５−310268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
できるが、蓋を開口した剥離面に外観不良を生じる難点
がある。また、特公平５−７９５８７号公報には、フラ
ンジ部の最内層厚みをＡμｍ、容器本体の側壁からフラ
ンジ部へかけての容器内面の変曲点部の最内層の厚みを
Ｂμｍ、最内層材料の破断強度をＣ kg／cm2とした際
に、Ａ≧１.１×Ｂ、Ｂ≦（１.３３／Ｃ）×１０4であ
り、かつ変曲部の最内層の破断強度が最内層とそれに接
する層の剥離強度より小さい多層容器が提案されてい
る。しかしながら、この構造では容器成形時のフランジ
部肉厚のバラツキ等で最内層のシール層の厚さが不安定
となることがあり、シール層が厚くなった場合には開封
が困難となるケースが生じる。[0004] As an opening mechanism different from these means,
The applicant has developed an easily openable sealed container in which a minute concave portion is formed on the entire surface or a part of the container main body flange portion (JP-A-3-200561, JP-A-3-226406).
JP-A-5-310268). According to this mechanism, it is possible to easily seal and break even if the positional accuracy of the sealing plate is poor, so that productivity and usability can be improved, but there is a problem that poor appearance occurs on the peeled surface where the lid is opened. . Japanese Patent Publication No. 5-79587 discloses that the innermost layer thickness of the flange portion is A μm, the thickness of the innermost layer at the inflection point portion of the inner surface of the container from the side wall of the container body to the flange portion is B μm, When the breaking strength of C is kg / cm 2 , A ≧ 1.1 × B, B ≦ (1.33 / C) × 10 4 , and the breaking strength of the innermost layer of the inflection portion is the innermost layer. And a multilayer container having a peel strength smaller than the peel strength of a layer in contact with the container. However, with this structure, the thickness of the innermost seal layer may become unstable due to variations in the thickness of the flange portion during molding of the container, and in some cases, it becomes difficult to open the seal layer when the seal layer becomes thicker. Occurs.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、従来
の構造とは異なる開封部機構を備え、優れたシール安定
性と容易な開封性とを兼備する密封容器を提供すること
にある。SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed container having an opening mechanism different from the conventional structure and having both excellent sealing stability and easy opening.
【０００６】[0006]
【課題を解決するための手段】本発明は、最内層にポリ
プロピレン系樹脂からなるシール層を有する２層以上の
多層シートからなり、容器本体の開口部周縁にフランジ
部が形成されたプラスチック製容器において、前記シー
ル層と該シール層に隣接するポリプロピレンと４メチル
ペンテン１樹脂との混合物からなる隣接層の層間剥離強
度Ａが０.５〜２.５kg／15mmで、前記隣接層とその外層
との層間剥離強度Ｂに対してＢ＞Ａの関係にあり、かつ
蓋材開封時における容器本体の初期開封部分にあたる容
器側面とフランジ部内縁との境界位置に局所的にシール
層の欠落部を形成し、フランジ部と蓋材間を容器本体の
シール層と隣接層の層間剥離強度Ａより高い接着強度に
シールしてなることを特徴とする密封容器であり、好ま
しくは シール層の欠落部をフランジ周回方向に２mm以
上の長さ、およびフランジ垂直方向に４mm以下の巾にな
るように形成する密封容器である。SUMMARY OF THE INVENTION The present invention relates to a plastic container comprising a multilayer sheet having two or more layers having a sealing layer made of a polypropylene resin as an innermost layer, wherein a flange is formed on the periphery of the opening of the container body. In the above, the delamination strength A of the seal layer and an adjacent layer made of a mixture of polypropylene and 4-methylpentene 1 resin adjacent to the seal layer is 0.5 to 2.5 kg / 15 mm. B> A with respect to the delamination strength B, and a missing portion of the sealing layer is locally formed at the boundary position between the container side surface, which corresponds to the initial opening portion of the container body when the lid material is opened, and the inner edge of the flange portion. A sealed container characterized in that the flange portion and the lid material are sealed with an adhesive strength higher than the delamination strength A of the seal layer of the container body and the adjacent layer, and preferably the seal layer has no seal layer. Part flange circumferential direction than 2mm length, and the flange vertically a sealed container formed to be less than a width 4 mm.
【０００７】本発明において、容器本体の初期開封部分
にあたる容器側面とフランジ内縁との境界位置は、蓋材
を引張り上げて開封する最に剥離抵抗が最も大きくなる
容器凹部の側面とフランジ内縁との境界位置を指す。し
たがって、この位置は容器凹部が単一の場合には一箇所
であるが、複数個の容器凹部が形成された分割型容器の
場合には各容器凹部について容器側面とフランジ内縁と
の境界位置が存在するから、各位置にシール層の欠落部
が形成される。図１は本発明の密封容器を示した全体の
断面図、図２は図１の密封容器を斜視図（一部切欠）と
して示したもので、１は容器本体、２はフランジ部、３
は蓋材、そして４はシール層の欠落部である。図３は初
期開封部分に相当するフランジ部分の拡大断面図、図４
は初期開封部分以外のフランジ部分を示した拡大断面図
で、５は蓋材３のシーラント層、６は容器本体のシール
層、７は前記シール層に隣接する隣接層、８は前記隣接
層７に一体成形されている外層、９はシール部分であ
る。In the present invention, the boundary position between the side surface of the container, which corresponds to the initial opening portion of the container body, and the inner edge of the flange is determined by the distance between the side surface of the concave portion of the container and the inner edge of the flange where the peeling resistance is greatest when the lid is pulled up and opened. Refers to the boundary position. Therefore, this position is one position when the container concave portion is single, but in the case of a split type container in which a plurality of container concave portions are formed, the boundary position between the container side surface and the inner edge of the flange for each container concave portion. Because of the existence, a missing portion of the seal layer is formed at each position. FIG. 1 is an overall sectional view showing a sealed container of the present invention, and FIG. 2 is a perspective view (partially cut away) of the sealed container of FIG.
Is a cover material, and 4 is a missing portion of the sealing layer. FIG. 3 is an enlarged sectional view of a flange portion corresponding to an initial opening portion, and FIG.
Is an enlarged sectional view showing a flange portion other than the initial opening portion, 5 is a sealant layer of the lid material 3, 6 is a seal layer of the container body, 7 is an adjacent layer adjacent to the seal layer, and 8 is an adjacent layer 7 The outer layer 9 is integrally formed with the sealing member 9.
【０００８】容器本体１を構成する多層シートとしては
任意のものが用いられる。シール層６はポリプロピレン
（以下「ＰＰ」と略称する）よりなっており、こりＰＰ
を用いることにより、耐熱性、耐油性、透明性を有する
積層体を得ることができる。使用するＰＰとしては、ホ
モ、ブロック、ランダムの種々のＰＰを任意に用いるこ
とができる。蓋とのシール性及び成形性を考慮して、Ｐ
Ｐ１００重量部に対して３〜２０重量部のポリエチレン
をブレンドすることも可能である。またポリエチレンの
他に不飽和カルボン酸変性ポリオレフィンやエチレン酢
酸ビニル共重合体等の熱可塑性樹脂のブレンドも中間層
との耐熱剥離性、透明性を損なわない範囲で可能であ
る。[0008] As the multilayer sheet constituting the container body 1, an arbitrary one is used. The sealing layer 6 is made of polypropylene (hereinafter abbreviated as “PP”).
By using, a laminate having heat resistance, oil resistance, and transparency can be obtained. As the PP to be used, various PPs such as homo, block, and random can be arbitrarily used. In consideration of the sealing property with the lid and moldability,
It is also possible to blend 3 to 20 parts by weight of polyethylene with respect to 100 parts by weight of P. In addition to polyethylene, a blend of a thermoplastic resin such as an unsaturated carboxylic acid-modified polyolefin or an ethylene-vinyl acetate copolymer is also possible as long as heat-peelability with the intermediate layer and transparency are not impaired.
【０００９】隣接層７は本発明において最も重要な役割
を果たすものであり、この隣接層はポリプロピレンと４
メチルペンテン１樹脂とのブレンド物を主体とする。ブ
レンド比は任意であるが、ポリプロピレン量として９０
〜２０重量％及び４メチルペンテン１樹脂として１０〜
８０重量％が好ましいが、最も好適な配合比はポリプロ
ピレン量として８０〜４０重量％である。ポリプロピレ
ンの量が９０重量％以上になると開封が困難となり、逆
に２０重量％以下になると層間剥離強度が弱くなりデラ
ミネーションを起こす恐れがある。また、微妙な層間剥
離強度を調整するために、ポリエチレンをブレンドする
ことも可能であるが、ブレンド量が多すぎると目的とす
る耐熱性を損なう場合があり、ブレンド量としてはポリ
プロピレン１００重量部に対して、２０重量部を上限と
し、またブレンド量が少ないとその層間剥離強度を調整
することができないため、３重量部を下限とすることが
望ましい。また同様に微妙な層間剥離強度を調整するた
めに、不飽和カルボン酸変性ポリプロピレンをブレンド
することがあるが、このブレンドについても、ブレンド
量が多すぎると、剥離強度を強め、かつブレンド量が少
ないと層間剥離強度を失うことがあるため２０重量部以
下３重量部以上が望ましい。The adjacent layer 7 plays the most important role in the present invention, and the adjacent layer is made of polypropylene and 4
Mainly a blend with methylpentene 1 resin. The blending ratio is arbitrary, but the amount of polypropylene is 90%.
20% by weight and 10% as 4-methylpentene 1 resin
Although 80% by weight is preferable, the most preferable compounding ratio is 80 to 40% by weight in terms of the amount of polypropylene. When the amount of polypropylene is 90% by weight or more, opening becomes difficult, and when the amount is 20% by weight or less, delamination strength is weakened and delamination may occur. It is also possible to blend polyethylene to finely control the delamination strength.However, if the blend amount is too large, the desired heat resistance may be impaired, and the blend amount is 100 parts by weight of polypropylene. On the other hand, the upper limit is preferably 20 parts by weight, and if the blending amount is small, the delamination strength cannot be adjusted. Therefore, the lower limit is preferably 3 parts by weight. Similarly, unsaturated carboxylic acid-modified polypropylene may be blended in order to adjust delicate delamination strength. However, if this blend amount is too large, the peel strength is increased and the blend amount is small. And 20 parts by weight or less and 3 parts by weight or more are desirable since the interlayer peel strength may be lost.
【００１０】隣接層７の外側に一体成形される外層８と
しては、例えば容器に保存性を持たせるバリア層として
ＥＶＯＨや塩化ビニリデン共重合体（以下「ＰＶＤＣ」
と略称する）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ＰＰ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。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。したがって、容器本体１の多層体構成としては、シ
ール層／隣接層／中間層／バリア層／最外層が、（ＰＰ
／ＰＰ┼ＭＰ／ＰＰ／ＥＶＯＨ／ＰＰ）、（ＰＰ／ＰＰ
＋ＭＰ／ＰＰ）、（ＰＰ／ＰＰ┼ＭＰ／ＰＰ／ＥＶＯＨ
／無機充填剤入りＰＰ）、（ＰＰ／ＰＰ┼ＭＰ／ＰＰ／
ＥＶＯＨ／ＰＣ）などの組合せを例示することができ
る。なお、これら多層構成においてＥＶＯＨと他の樹脂
層との間は、例えば不飽和カルボン酸変性ポリエチレ
ン、不飽和カルボン酸変性ポリプロピレン、不飽和カル
ボン酸変性ポリスチレンなどの接着性樹脂により接着さ
れる。The outer layer 8 integrally formed on the outer side of the adjacent layer 7 is, for example, an EVOH or vinylidene chloride copolymer (hereinafter referred to as “PVDC”) as a barrier layer for imparting storage stability to the container.
May be disposed thereon, or PP or the like may be further laminated as an outer layer for the purpose of improving strength or a water vapor barrier, and various adhesives may be used to firmly bond these layers. . In addition, as an adjacent layer, not only plastic but also any metal layer can be used, and these metal layers can also be used as other functional layers. Therefore, as a multilayer structure of the container body 1, the seal layer / adjacent layer / intermediate layer / barrier layer / outermost layer is (PP
/ PP @ MP / PP / EVOH / PP), (PP / PP
+ MP / PP), (PP / PP┼MP / PP / EVOH
/ PP with inorganic filler), (PP / PP @ MP / PP /
EVOH / PC). In these multilayer structures, the EVOH and the other resin layer are bonded with an adhesive resin such as unsaturated carboxylic acid-modified polyethylene, unsaturated carboxylic acid-modified polypropylene, and unsaturated carboxylic acid-modified polystyrene.
【００１１】蓋材３には、フランジ部のシール層６とシ
ール可能なものであれば任意の樹脂フィルムを用いるこ
とができるが、とくにシール層６と強固に密着する材質
のシーラント層５を有することが好ましい。本発明では
ポリプロピレンが適しており、これにポリエチレン、不
飽和カルボン酸変性ポリプロピレン等をブレンドするこ
とができる。バリア層としてはＥＶＯＨ、ＰＶＤＣ、ア
ルミニウム箔（以下「Ａｌ」と略称する）、ナイロン
（以下「Ｎｙ」と略称する）、各種の蒸着フィルムが使
用でき、その他の補強層にはＮｙ、ＰＥＴ、ＰＰ等が用
いられる。これらのシーラント層、バリア層及び補強層
は、用途に応じた任意の組合せが可能である。蓋材３の
多層構成（右側がシーラント層）としては、例えばＮｙ
／ＥＶＯＨ／ＰＰ、ＰＥＴ／ＥＶＯＨ／Ｎｙ／ＰＰ、Ｎ
ｙ／ＰＰ、ＰＥＴ／Ａｌ／ＰＰ、ＰＥＴ／ＰＶＤＣ／Ｐ
Ｐなどが挙げられる。また、蓋材３は平面フィルム形状
に限らず、多層シートを熱成形した落とし蓋形状のもの
を用いることができる。The cover 3 can be made of any resin film as long as it can seal with the seal layer 6 of the flange portion. The cover 3 has a sealant layer 5 made of a material which is firmly adhered to the seal layer 6. Is preferred. In the present invention, polypropylene is suitable, and polyethylene, unsaturated carboxylic acid-modified polypropylene and the like can be blended with polypropylene. As the barrier layer, EVOH, PVDC, aluminum foil (hereinafter abbreviated as “Al”), nylon (hereinafter abbreviated as “Ny”), various kinds of vapor-deposited films can be used, and Ny, PET, PP can be used as other reinforcing layers. Are used. These sealant layers, barrier layers, and reinforcing layers can be arbitrarily combined according to applications. As the multilayer structure of the lid member 3 (the sealant layer on the right side), for example, Ny
/ EVOH / PP, PET / EVOH / Ny / PP, N
y / PP, PET / Al / PP, PET / PVDC / P
P and the like. Further, the lid member 3 is not limited to a flat film shape, and a drop lid shape obtained by thermoforming a multilayer sheet can be used.
【００１２】本発明の容器構成は、シール層６と隣接層
７の層間剥離強度Ａが０.５〜２.５kg／15mmで、隣接層
７とその外層８との層間剥離強度Ｂに対して、Ｂ＞Ａの
関係にあることが第１の要件なる。この要件は、容器に
易開封性を付与するための前提要件となるもので、シー
ル層６と隣接層７の層間剥離強度Ａが隣接層７とその外
層８との層間剥離強度Ｂより大きくなり、また２.５ kg
／15mmより大きくなると、開封時の剥離抵抗が増して円
滑な開封性が損なわれ、また、前記の層間剥離強度Ａが
０.５ kg／15mmより小さくなると、密封性が低下する。
第２の要件としては、シール層６にＰＰを用い、隣接層
７にＰＰとＭＰの混合物を用いることにある。この組み
合わせにより耐熱性は飛躍的に向上し、殺菌温度が高く
なっても、シール層６と隣接層７の層間剥離強度が低下
することがなく、安定した易開封性を得ることができ
る。The container structure of the present invention has a delamination strength A of 0.5 to 2.5 kg / 15 mm between the sealing layer 6 and the adjacent layer 7 and a delamination strength B of the adjacent layer 7 and the outer layer 8. , B> A is a first requirement. This requirement is a prerequisite for imparting easy-openability to the container, and the delamination strength A between the sealing layer 6 and the adjacent layer 7 is larger than the delamination strength B between the adjacent layer 7 and the outer layer 8. And 2.5 kg again
If it is larger than / 15 mm, the peeling resistance at the time of opening increases and the smooth opening property is impaired, and if the above-mentioned interlayer peeling strength A is less than 0.5 kg / 15 mm, the sealing property decreases.
The second requirement is that PP is used for the seal layer 6 and a mixture of PP and MP is used for the adjacent layer 7. By this combination, the heat resistance is remarkably improved, and even if the sterilization temperature is increased, the delamination strength between the seal layer 6 and the adjacent layer 7 does not decrease, and stable easy-openability can be obtained.
【００１３】本発明の主要な要件は、蓋材開封時におけ
る容器本体の初期開封部分にあたる容器側面とフランジ
内縁との境界位置に局所的にシール層６の欠落部４を形
成した点にあり、この欠落部４の形成により密封性を減
退させずに優れた易開封性機能が付与される。該シール
層の欠落部４は、図５（部分拡大図）に示すようにフラ
ンジ周回方向の長さＬが２mm以上で、フランジ垂直方向
の幅が４mm以下になるように設計することが好ましい。
フランジ周回方向の長さＬが２mm未満では開封時の剥離
抵抗を低下させることが困難となり、またフランジ垂直
方向の幅Ｗが４mmを越えると密封性を減退させる原因と
なる。最適な欠落部４の寸法形状は、フランジ周回方向
の長さＬが３〜１０mmで、フランジ垂直方向の幅Ｗが２
〜３mmの範囲である。The main requirement of the present invention is that the notch 4 of the sealing layer 6 is locally formed at the boundary between the container side surface, which corresponds to the initial opening portion of the container body when the lid is opened, and the inner edge of the flange. Due to the formation of the missing portion 4, an excellent easy-opening function is provided without deteriorating the sealing performance. As shown in FIG. 5 (partially enlarged view), the notch 4 of the seal layer is preferably designed such that the length L in the circumferential direction of the flange is 2 mm or more and the width in the vertical direction of the flange is 4 mm or less.
If the length L in the flange circumferential direction is less than 2 mm, it is difficult to reduce the peeling resistance at the time of opening, and if the width W in the vertical direction of the flange exceeds 4 mm, the sealing performance is reduced. The optimal shape of the notch 4 is such that the length L in the circumferential direction of the flange is 3 to 10 mm and the width W in the vertical direction of the flange is 2 mm.
３3 mm.
【００１４】本発明の対象となる容器形態は、図２に示
した丸型容器に限らず、図６のような四角型、図７のよ
うな三角型、図８のような多凹部連結型など多様なタイ
プに利用することができ、いずれの場合も矢印で示した
蓋材開封側における容器本体の初期開封部分にあたる容
器側面とフランジ内縁との境界位置にシール層６の欠落
部４が形成される。なお、図８のように複数の容器凹部
が形成された分割型容器にあっては、各容器凹において
おいて初期開封部分にあたる容器側面とフランジ内縁と
の境界位置にシール層６の欠落部４を形成する。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６とシーラント層５を重ね合わせ、接着することによ
りシール部分８が形成されるが、この部位の接着強度
は、容器フランジのシール層６と隣接層７の層間剥離強
度Ａより高くする。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 type as shown in FIG. 6, a triangular type as shown in FIG. In any case, the missing portion 4 of the sealing layer 6 is formed at the boundary between the container side surface corresponding to the initial opening portion of the container body and the inner edge of the flange on the lid opening side indicated by the arrow. Is done. In the case of a split type container having a plurality of container recesses as shown in FIG. 8, the cutout 4 of the seal layer 6 is provided at the boundary between the container side surface corresponding to the initial opening portion and the inner edge of the flange in each container recess. To form The flange portion 2 and the lid member 3 of the container body 1 finally form a seal portion 8 by overlapping and bonding the mutual seal layer 6 and the sealant layer 5. The peel strength A between the sealing layer 6 and the adjacent layer 7 of the flange is made higher.
【００１５】上記の密封容器を製造するための本発明に
よる方法は、最内層にシール層を有する２層以上の多層
シートを連続的に金型上に供給して容器形状に加熱成形
したのち、欠落部を形成する部位の内周面が部分的にフ
ランジ巾より内周方向に張り出す突出部を有し、その他
の内周面がフランジ内縁と同等以内にある形状のリング
状抑え部材を用いて直ちに押圧して蓋材開封時における
容器本体の初期開封部分にあたる容器側面とフランジ内
縁との境界位置に局所的にシール層の欠落部を形成し、
形成された容器本体のフランジ部に蓋材を重ねて接着す
ることを特徴とする。予め共押出法、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によ
り成形された最内層にシール層を有する２層以上の多層
シートを、加熱帯域を通して所定形状の金型上に連続的
に供給し、プラグ成形、真空成形または圧空成形により
容器形状に成形する。ついで、直ちに金型の周縁平面部
を上部からリング上抑え板により押圧してフランジ部を
形成する。The method according to the present invention for producing the above-mentioned sealed container comprises the steps of continuously supplying a multilayer sheet having two or more layers having a seal layer in the innermost layer onto a mold and heating and forming the same into a container shape. Using a ring-shaped restraining member of a shape in which the inner peripheral surface of the portion forming the cutout part has a protruding portion that partially projects in the inner peripheral direction from the flange width, and the other inner peripheral surface is within the same as the inner edge of the flange Press immediately to form a missing portion of the seal layer locally at the boundary position between the container side surface and the inner edge of the flange, which corresponds to the initial opening portion of the container body when opening the lid material,
The lid material is overlapped and adhered to the formed flange portion of the container body. A multilayer sheet of two or more layers having a seal layer in the innermost layer previously formed by a coextrusion method, a dry lamination method, a coextrusion lamination method, a thermal lamination method, etc., is continuously passed through a heating zone on a mold having a predetermined shape. It is supplied and molded into a container shape by plug molding, vacuum molding or air pressure molding. Then, the peripheral flat portion of the mold is immediately pressed from above by a ring-on retaining plate to form a flange portion.
【００１６】この際、図９（平面図）および図１０（図
９のＡ−Ａ断面図）に示すように、欠落部を形成する部
位の内周面が部分的にフランジ巾より内周方向に張り出
す突出部１０を有し、その他の内周面がフランジ内縁と
同等以内にある形状のリング状抑え板１１を用いて金型
１２の周縁平面部を押圧する。押圧時、リング状抑え部
材１１の突出部１０を有する部分で押圧されたフランジ
部の断面は、図１１に示すように溶融あるいは軟化状態
の隣接層７がフランジ内縁側の無圧力の方向に押し出さ
れ、突出部１０の長さに相当する部位に膨出現象が生じ
る。この膨出現象が発生すると、この部分を被覆してい
た薄いシール層６が破られ、局所的に欠落部４が形成さ
れる。このようにして、蓋材開封時における容器本体の
初期開封部分にあたる容器側面とフランジ内縁との境界
位置に局所的にシール層６の欠落部４が形成されるが、
欠落部４のフランジ周回方向の長さＬおよびフランジ垂
直方向の幅Ｗは、リング状抑え板１１に形成する突出部
１０の寸法と押圧力によって調整することができる。形
成された容器本体１のフランジ部２には蓋材３のシート
を重ね、最終的に相互のシール層６とシーラント層５を
一体に接着してシール部分９を形成する。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
シール法等が適宜に用いられる。At this time, as shown in FIG. 9 (plan view) and FIG. 10 (cross-sectional view taken along the line AA in FIG. 9), the inner peripheral surface of the portion where the notch is formed is partially inwardly larger than the flange width. A ring-shaped suppressing plate 11 having a protruding portion 10 that projects over the inner surface and the other inner peripheral surface being within the same range as the inner edge of the flange is used to press the peripheral flat surface of the mold 12. At the time of pressing, the cross section of the flange portion pressed by the portion having the protruding portion 10 of the ring-shaped suppressing member 11 is such that the adjacent layer 7 in the molten or softened state is pushed out in the direction of no pressure on the inner edge side of the flange as shown in FIG. As a result, a swelling phenomenon occurs at a portion corresponding to the length of the protrusion 10. When this swelling phenomenon occurs, the thin seal layer 6 covering this portion is broken, and the missing portion 4 is locally formed. In this way, the missing portion 4 of the seal layer 6 is locally formed at the boundary position between the container side surface corresponding to the initial opening portion of the container main body when the lid material is opened and the inner edge of the flange.
The length L of the notch 4 in the flange circumferential direction and the width W in the flange vertical direction can be adjusted by the size and the pressing force of the protrusion 10 formed on the ring-shaped suppressing plate 11. A sheet of the lid material 3 is superimposed on the formed flange portion 2 of the container body 1, and finally, the mutual seal layer 6 and the sealant layer 5 are integrally bonded to form the seal portion 9. As a bonding method, a known heat sealing method, ultrasonic sealing method, high-frequency sealing method, or the like is appropriately used.
【００１７】[0017]
【作用】図１２は、本発明に係る密封容器の開封状況を
模式的に示した説明図である。蓋材３の開封端部を上方
に引っ張り上げると、フランジ部のシール層６と隣接層
７の層間で剥離が開始される。この際、シール層６と隣
接層７の層間剥離強度Ａが０.５〜２.５kg／15mmで、隣
接層７とその外層８との層間剥離強度Ｂに対してＢ＞Ａ
の関係にあるため、前記の層間剥離は円滑に進行する。
この層間剥離がシール層６の欠落部４に至ると、剥離抵
抗は解放される。欠落部４を過ぎた以後の開封は、比較
的弱い引き裂き破壊力を介してフランジ内縁部あるいは
フランジシール部分の最内縁部に沿って伝播的に進行
し、容易に蓋材が分離される。上記の作用で、優れた蓋
材の開封が可能になるが、シール層の欠落部は容器本体
の初期開封部分にあたる容器側面とフランジ内縁との境
界位置に局所的に設置されており、シール層の隣接層に
達するような切り込みとして形成されるものではないか
ら、内圧を受けた際にシール洩れが発生する現象が生じ
ることもない。したがって、優れた開封性と密封性を同
時に付与することができる。また、本発明の製造方法に
よれば、容器形状に加熱成形した後、欠落部を形成する
部位の内周面が部分的にフランジ巾より内周方向に張り
出した突出部を有し、その他の内周面がフランジ内縁と
同等以内にある形状のリング状抑え板を用いてフランジ
面を押圧することにより容易に局所的なシール層の欠落
部を形成することができる。このため、優れた易開封性
の密閉容器を生産性よく製造することが可能となる。FIG. 12 is an explanatory view schematically showing the opening state of the sealed container according to the present invention. When the opening end of the lid member 3 is pulled upward, peeling starts between the sealing layer 6 and the adjacent layer 7 in the flange portion. At this time, the delamination strength A between the sealing layer 6 and the adjacent layer 7 is 0.5 to 2.5 kg / 15 mm, and the delamination strength B between the adjacent layer 7 and the outer layer 8 is B> A.
, The above-mentioned delamination proceeds smoothly.
When the delamination reaches the missing portion 4 of the seal layer 6, the delamination resistance is released. Opening after passing through the notch 4 propagates along the inner edge of the flange or the innermost edge of the flange seal portion via a relatively weak tearing and breaking force, and the lid material is easily separated. Due to the above-mentioned action, excellent opening of the lid material becomes possible, but the missing portion of the sealing layer is locally installed at the boundary position between the container side surface corresponding to the initial opening portion of the container body and the inner edge of the flange, and the sealing layer is provided. Is not formed as a notch reaching the adjacent layer, there is no occurrence of a phenomenon that a seal leak occurs when an internal pressure is applied. Therefore, excellent openability and sealability can be simultaneously provided. Further, according to the production method of the present invention, after being heat-molded into a container shape, the inner peripheral surface of the portion where the notch is formed partially has a protruding portion that protrudes in the inner peripheral direction from the flange width, and other By pressing the flange surface using a ring-shaped restraining plate having an inner peripheral surface within the same range as the inner edge of the flange, a local missing portion of the seal layer can be easily formed. For this reason, it becomes possible to manufacture an easily openable closed container with excellent productivity.
【００１８】[0018]
【実施例】以下、本発明の実施例を比較例と対比して具
体的に説明する。 《実施例１〜３》共押出法により作製された表１に示す
組成および表２に示す層間剥離強度を備えた多層シート
を、間接加熱式の圧空成形機にセットされた金型上に連
続的に供給して圧空成形により容器内径（口径）６４m
m、高さ３０mm、フランジ巾６mm、初期開封部分のフラ
ンジ巾１５mm、フランジ内縁周長２００mmの丸形単一容
器に成形した。ついで、直ちにフランジ部の上部を欠落
部形成部位の内周面に長さ１０mm、巾４mmの突出部を有
し、その他の内周面がフランジ巾と同一寸法のリング上
抑え部材（図９）により面圧１０kg／cm2 で押圧した。
この押圧処理により、蓋材開封時における容器本体の初
期開封部分にあたる容器側面とフランジ内縁との境界位
置に、フランジ周回方向の長さ（Ｌ）が４mmで、フラン
ジ垂直方向の巾（Ｗ）が２mmのシール層の欠落部を形成
した。EXAMPLES Examples of the present invention will be specifically described below in comparison with comparative examples. << Examples 1 to 3 >> A multilayer sheet having the composition shown in Table 1 and the delamination strength shown in Table 2 produced by the coextrusion method was continuously placed on a mold set in an indirect heating type air pressure molding machine. The inner diameter (diameter) of the container is 64m
m, a height of 30 mm, a flange width of 6 mm, a flange width of an initially opened part of 15 mm, and a flange inner edge circumference of 200 mm were formed into a single round container. Then, the upper part of the flange portion is immediately provided with a protruding portion of 10 mm in length and 4 mm in width on the inner peripheral surface of the portion where the missing portion is formed, and the other inner peripheral surface is a ring-holding member having the same dimensions as the flange width (FIG. 9). At a surface pressure of 10 kg / cm 2 .
Due to this pressing treatment, the length (L) in the flange circling direction and the width (W) in the flange vertical direction are 4 mm at the boundary position between the container side surface corresponding to the initial opening portion of the container body and the inner edge of the flange when the lid material is opened. A missing portion of a 2 mm seal layer was formed.
【００１９】 表 １ シール層 隣接層 中間層 バリア層 最外層 実施例１ PP(30) [PP＋MP](20) PP(180) EVOH(100) PP(520) 60：40 実施例２ PP(50) [PP＋MP＋PE](10) PP(180) EVOH(100) PP(520) 60：30：10 実施例３ PP(15) [PP＋MP](20) PP(180) EVOH(100) PP(520) 80：20 表注：（ ）内は層厚み（μｍ）、 隣接層の下ぶの数字はＰＰとＭＰ等のブレンド比率（重量％）Table 1 Seal layer Adjacent layer Intermediate layer Barrier layer Outermost layer Example 1 PP (30) [PP + MP] (20) PP (180) EVOH (100) PP (520) 60:40 Example 2 PP (50) [PP + MP + PE] (10 ) PP (180) EVOH (100) PP (520) 60:30:10 Example 3 PP (15) [PP + MP] (20) PP (180) EVOH (100) PP (520) 80:20 Table Note: ( The number in parentheses is the layer thickness (μm). The number below the adjacent layer is the blend ratio of PP and MP (% by weight).
【００２０】 表 ２ 層間剥離強度（kg／15mm） シール層と隣接層間 隣接層と外層間 実施例１ １.５ ２.２ 実施例２ １.０ １.８ 実施例３ ２.３ ２.６ Table 2 Interlaminar peel strength (kg / 15mm) Seal layer and adjacent layer Adjacent layer and outer layer Example 1 1.5 2.2 Example 2 1.0 1.8 Example 3 2.3 2.6
【００２１】蓋材として、容器のシール層と同一の樹脂
を用いて厚さ５０μmのシーラント層とし、これを延伸
したポリアミド（厚さ３０μm）をドライラミネートし
たものを用いた。ヒートシールは、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、面圧１５ kg／c
m2、温度２１０℃、時間１秒の条件で２回にわたって熱
封止した。このようにして製造した密封容器の各５０個
について蓋を開封したところ、容器本体の初期開封部分
にあたる容器側面とフランジ内縁との境界位置でピール
抵抗感が高まることなく、容易に開封が進行し、開封面
の状態も極めて良好であった。また、密封性テストとし
て容器に内容物として水を詰め、１３０℃×２０分の条
件で熱水中で殺菌を行い、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耐内圧性を測定したと
ころ、テストを行ったすべての容器が１.２kg／cm2以上
の内圧に耐え、優れた密封性を示すことが確認された。As the lid material, a sealant layer having a thickness of 50 μm was formed using the same resin as the seal layer of the container, and a stretched polyamide (thickness: 30 μm) was dry-laminated. Heat sealing is performed by overlaying the sealant layer of the lid material on the sealing layer surface of the container flange, and applying a surface pressure of 15 kg / c.
Heat sealing was performed twice under the conditions of m 2 , temperature 210 ° C., and time 1 second. When the lid was opened for each of the 50 sealed containers thus manufactured, the opening easily proceeded without increasing the peel resistance at the boundary position between the container side surface corresponding to the initial opening portion of the container body and the inner edge of the flange. The state of the opening surface was also very good. In addition, as a sealing test, the container was filled with water as the contents, sterilized in hot water at 130 ° C. for 20 minutes, and compressed air was injected from the top of the lid so as not to leak. When the properties were measured, it was confirmed that all the containers tested endured an internal pressure of 1.2 kg / cm 2 or more and exhibited excellent sealing properties.
【００２２】《比較例１》実施例で得た容器本体のフラ
ンジ面に、フランジの最内縁部に沿って１mm外側の位置
に深さ８０μmの切り込みを全周及び切り込みが内縁部
周長の１／１０以下になるように初期開封部にわたって
入れた。この容器本体に実施例と同一の蓋材を同条件に
よりヒートシールして、密封容器を得た。得られた密封
容器について実施例と同様のテストを行ったところ、切
り込み部の位置ずれ、ヒートシールの位置ずれ等に起因
するピール感不良のものや、耐内圧性不良のものが多数
発生した。またこれらの不良品については開封後の外観
として、開口部に糸ひき状にヒゲが発生したり、開封時
にシール層が適宜に破断されず袋状になり内容物が取り
出せないものがあった。その結果をシール層欠落部の形
状寸法と対比して表３に示した。Comparative Example 1 An incision having a depth of 80 μm was formed on the flange surface of the container main body obtained in the example at a position 1 mm outside along the innermost edge of the flange, and the incision was one in the peripheral length of the inner edge. / 10 or less over the initial opening. The same lid material as in the example was heat-sealed to the container body under the same conditions to obtain a sealed container. A test similar to that of the example was performed on the obtained sealed container. As a result, a large number of defective containers having poor peeling feeling and poor internal pressure resistance caused by positional deviation of the cut portion, positional deviation of the heat seal, and the like were generated. In addition, as for the appearance of these defective products after opening, there was a whisker generated in a thread-like shape at the opening, or the seal layer was not appropriately broken at the time of opening and became a bag-like shape so that the contents could not be taken out. The results are shown in Table 3 in comparison with the shape and dimensions of the seal layer missing portion.
【００２３】《実施例４、５》実施例１の多層シートを
用いて同様に圧空成形したのち、直ちに容器のフランジ
部を突出部形状が相違するリング状抑え板（図９）によ
り面圧条件を変えて押圧し、蓋材開封時における容器本
体の初期開封部分にあたる容器側面とフランジ内縁との
境界位置に寸法形状の異なるシール層の欠落部を形成し
た。この容器に実施例１と同一条件で蓋材をヒートシー
ルして密封容器を作製した。得られた密封容器について
実施例１と同様に開封性と耐内圧性を評価し、その結果
をシール層欠落部の形状寸法と対比して表３に示した。<< Examples 4 and 5 >> After the air-pressure molding was similarly performed using the multilayer sheet of Example 1, the flange portion of the container was immediately subjected to surface pressure conditions using a ring-shaped restraining plate (FIG. 9) having a different projecting portion shape. Was changed and pressed to form a missing portion of a seal layer having different dimensions and shape at the boundary position between the container side surface, which corresponds to the initial opening portion of the container body when the lid material was opened, and the inner edge of the flange. The container was heat-sealed under the same conditions as in Example 1 to produce a sealed container. The openability and internal pressure resistance of the obtained sealed container were evaluated in the same manner as in Example 1, and the results are shown in Table 3 in comparison with the shape and size of the seal layer missing portion.
【００２４】 表 ３ シール層の欠落部 開封の状況 耐内圧性 長さ(Ｌ) 巾(Ｗ) (kg／cm2) (mm) (mm) 比較例１ １ ５ ピール性若干不良 １.０ 実施例４ ３ ３ 極めて良好 １.２以上 実施例５ ８ ２ 極めて良好 １.２以上 Table 3 Missing portion of seal layer Opening status Internal pressure resistance Length (L) Width (W) (kg / cm 2 ) (mm) (mm) Comparative Example 1 15 Peeling property slightly poor 1.0 Example 4 3 3 Extremely Good 1.2 or more Example 5 8 2 Very good 1.2 or more
【００２５】《比較例２、３》共押出法により作製され
た表３に示す組成及び表４にに示す層間剥離強度を備え
た多層シートを、間接加熱式の圧空成形機にセットされ
た金型上に連続的に供給して圧空成形により容器内径
（口径）６４mm、高さ３０mm、フランジ幅６mm、初期開
封部分のフランジ幅１５mm、フランジ内縁周長２００mm
の丸型単一容器に成形した。次いで、直ちにフランジ部
の上部を欠落部形成部位の内周面に長さ１０mm、幅４mm
の突出部を有し、その他の内周面がフランジ幅と同一寸
法のリング状抑え部材（図９）により面圧１０kg／cm2
で押圧した。この押圧処理により、蓋材開封時における
容器本体の初期開封部分にあたる容器側面とフランジ内
縁との境界位置に、フランジ周回方向の長さ（Ｌ）が４
mで、フランジ垂直方向の幅（Ｗ）が２mmのシール層の
欠落部を形成した。<< Comparative Examples 2 and 3 >> A multilayer sheet having the composition shown in Table 3 and the delamination strength shown in Table 4 produced by the coextrusion method was prepared by using a gold sheet set in an indirect heating type pneumatic molding machine. It is continuously supplied on a mold and the inside diameter (diameter) of the container is 64 mm, the height is 30 mm, the flange width is 6 mm, the flange width of the initially opened part is 15 mm, and the inner peripheral edge length of the flange is 200 mm.
Into a single round container. Then, immediately, the upper part of the flange part is 10 mm long and 4 mm wide on the inner peripheral surface of the missing part forming part.
Surface pressure of 10 kg / cm 2 by a ring-shaped restraining member (Fig. 9) whose inner peripheral surface has the same dimensions as the flange width.
Was pressed. By this pressing process, the length (L) of the flange circling direction is 4 at the boundary position between the container side surface, which corresponds to the initial opening portion of the container main body when the lid material is opened, and the inner edge of the flange.
m, a missing portion of the seal layer having a width (W) in the flange vertical direction of 2 mm was formed.
【００２６】 表 ４ シール層 隣接層 中間層 バリア層 最外層 比較例２ PP(60) PP(50) PP(180) EVOH(100) PP(520) 比較例３ PP(50) PE(20) PP(180) EVOH(100) PP(520) 表注：（ ）内は層厚み（μｍ）、Table 4 Seal layer Adjacent layer Intermediate layer Barrier layer Outermost layer Comparative Example 2 PP (60) PP (50) PP (180) EVOH (100) PP (520) Comparative Example 3 PP (50) PE (20) PP (180) EVOH ( 100) PP (520) table Note: () indicates layer thickness (μm),
【００２７】 表 ５ 層間剥離強度（kg／15mm） シール層と隣接層間 隣接層と外層間 比較例２ １.５ ５.０ 比較例３ １.７ ２.３ Table 5 Delamination strength (kg / 15mm) Seal layer and adjacent layer Adjacent layer and outer layer Comparative Example 2 1.5 5.0 Comparative Example 3 1.7 2.3
【００２８】蓋材として、容器のシール層と同一の樹脂
を用いて厚さ５０μｍのシーラント層とし、これを延伸
したポリアミド（厚さ３０μｍ）をドライラミネートし
たものを用いた。ヒートシールは、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、面圧１５kg／cm
2 、温度２１０℃、時間１秒の条件で２回にわたって熱
封止した。このようにして製造した密封容器の各５０個
について、密封テストとして内容物に水を詰め、１３０
℃、２０分の条件で熱水中で殺菌を行ったところ、すべ
て密封が損なわれた。As the lid, a sealant layer having a thickness of 50 μm was formed by using the same resin as the seal layer of the container, and a stretched polyamide (thickness: 30 μm) was dry-laminated. For heat sealing, a sealant layer of a lid material is placed on the sealing layer surface of the container flange, and the surface pressure is 15 kg / cm.
2. Heat sealing was performed twice at a temperature of 210 ° C. for 1 second. For each of the 50 sealed containers thus manufactured, the contents were filled with water as a sealing test, and 130
When sterilization was performed in hot water at 20 ° C. for 20 minutes, all the seals were damaged.
【００２９】[0029]
【発明の効果】以上のとおり、本発明によれば初期開封
部分にあたる容器側面とフランジ内縁との境界位置に局
所的なシール層の欠落部を形成させた構造と容器本体の
層構成がシール層がＰＰ、隣接層がＰＰとＭＰのブレン
ド物となった構成とすることにより、優れたシール安定
性と常に円滑な開封性を兼備し、輸送中等に外部衝撃を
受けても、また高温加熱殺菌を行っても内容物が漏れる
ことがない高性能の密封容器が提供される。As described above, according to the present invention, the structure in which the local sealing layer is formed at the boundary between the container side surface corresponding to the initial opening portion and the inner edge of the flange, and the layer structure of the container body are the sealing layer. Is made of a blend of PP and MP, and the adjacent layer is made of a blend of PP and MP, so that it has both excellent seal stability and smooth openability. A high-performance sealed container in which the contents do not leak even when the sealing is performed is provided.
【図１】本発明に係る密封容器の全体を例示した断面図
である。FIG. 1 is a cross-sectional view illustrating the entirety of a sealed container according to the present invention.
【図２】本発明に係る密封容器の全体を例示した一部切
欠き断面図である。FIG. 2 is a partially cutaway sectional view illustrating the entirety of the sealed container according to the present invention.
【図３】本発明に係る密封容器のシール層欠落部分側の
フランジ部を拡大した断面図である。FIG. 3 is an enlarged cross-sectional view of a flange portion of the sealed container according to the present invention on a side where a seal layer is missing.
【図４】本発明に係る密封容器のシール層欠落部分側以
外のフランジ部を拡大した断面図である。FIG. 4 is an enlarged sectional view of a flange portion of the sealed container according to the present invention other than a portion where a seal layer is missing.
【図５】本発明に係る密封容器のシール層欠落部分を拡
大して示した説明図である。FIG. 5 is an explanatory diagram showing an enlarged view of a portion of the sealed container according to the present invention where a seal layer is missing.
【図６】本発明の別の容器形態を示した斜視図である。FIG. 6 is a perspective view showing another container configuration of the present invention.
【図７】本発明の別の容器形態を示した斜視図である。FIG. 7 is a perspective view showing another container form of the present invention.
【図８】本発明の別の容器形態を示した斜視図である。FIG. 8 is a perspective view showing another container form of the present invention.
【図９】本発明の製造方法に用いるリング状抑え板の使
用状態を示した平面図である。FIG. 9 is a plan view showing a use state of a ring-shaped holding plate used in the manufacturing method of the present invention.
【図10】図９のＡ−Ａ線に沿う断面図である。FIG. 10 is a sectional view taken along line AA in FIG. 9.
【図11】リング状抑え板による押圧状態を示した部分拡
大断面図である。FIG. 11 is a partially enlarged sectional view showing a pressed state by a ring-shaped suppressing plate.
【図12】本発明に係る密封容器の開封状況を模式的に示
したフランジ部の拡大断面図である。FIG. 12 is an enlarged cross-sectional view of a flange portion schematically showing an opening state of the sealed container according to the present invention.
１ 容器本体 ２ フランジ部 ３ 蓋材 ４ シール層の欠落部 ５ 蓋材のシーラント層 ６ フランジ部のシール層 ７ 隣接層 ８ 外層 ９ シール部分 10 突出部 11 リング状抑え板 12 金型 DESCRIPTION OF SYMBOLS 1 Container main body 2 Flange part 3 Lid material 4 Missing part of a sealing layer 5 Sealant layer of a lid material 6 Seal layer of a flange part 7 Adjacent layer 8 Outer layer 9 Sealed part 10 Projection part 11 Ring-shaped suppressing plate 12 Mold
フロントページの続き (56)参考文献 特開 平３−98872（ＪＰ，Ａ) 特開 平７−32551（ＪＰ，Ａ)Continuation of the front page (56) References JP-A-3-98872 (JP, A) JP-A-7-32551 (JP, A)
Claims (2)
シール層を有する２層以上の多層シートからなり、容器
本体の開口部周縁にフランジ部が形成されたプラスチッ
ク製容器において、前記シール層と該シール層に隣接す
るポリプロピレンと４メチルペンテン１樹脂との混合物
からなる隣接層の層間剥離強度Ａが０.５〜２.５kg／15
mmで、前記隣接層とその外層との層間剥離強度Ｂに対し
てＢ＞Ａの関係にあり、かつ蓋材開封時における容器本
体の初期開封部分にあたる容器側面とフランジ部内縁と
の境界位置に局所的にシール層の欠落部を形成し、フラ
ンジ部と蓋材間を容器本体のシール層と隣接層の層間剥
離強度Ａより高い接着強度にシールしてなることを特徴
とする密封容器。1. A plastic container comprising a multi-layered sheet of two or more layers having a sealing layer made of a polypropylene resin as an innermost layer, wherein a flange is formed around the opening of the container body. Adjacent layer composed of a mixture of polypropylene and 4-methylpentene 1 resin has a delamination strength A of 0.5 to 2.5 kg / 15.
mm, the relation between B and A with respect to the delamination strength B between the adjacent layer and the outer layer, and at the boundary position between the container side surface corresponding to the initial opening portion of the container body when the lid material is opened and the inner edge of the flange portion. A sealed container characterized by locally forming a missing portion of a seal layer, and sealing between a flange portion and a lid member with an adhesive strength higher than a delamination strength A between a seal layer of a container body and an adjacent layer.
２mm以上の長さ、およびフランジ垂直方向に４mm以下の
巾になるように形成する請求項１記載の密封容器。2. The sealed container according to claim 1, wherein the missing portion of the sealing layer is formed so as to have a length of 2 mm or more in a circumferential direction of the flange and a width of 4 mm or less in a direction perpendicular to the flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16842795A JP3194689B2 (en) | 1995-07-04 | 1995-07-04 | Sealed container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16842795A JP3194689B2 (en) | 1995-07-04 | 1995-07-04 | Sealed container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0920370A JPH0920370A (en) | 1997-01-21 |
| JP3194689B2 true JP3194689B2 (en) | 2001-07-30 |
Family
ID=15867926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16842795A Expired - Fee Related JP3194689B2 (en) | 1995-07-04 | 1995-07-04 | Sealed container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3194689B2 (en) |
-
1995
- 1995-07-04 JP JP16842795A patent/JP3194689B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0920370A (en) | 1997-01-21 |
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