JPH02109873A - Easy opening sealing container and its manufacture - Google Patents
Easy opening sealing container and its manufactureInfo
- Publication number
- JPH02109873A JPH02109873A JP25838388A JP25838388A JPH02109873A JP H02109873 A JPH02109873 A JP H02109873A JP 25838388 A JP25838388 A JP 25838388A JP 25838388 A JP25838388 A JP 25838388A JP H02109873 A JPH02109873 A JP H02109873A
- Authority
- JP
- Japan
- Prior art keywords
- lid
- sealing
- heat
- container
- intermediate material
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 108
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims abstract description 177
- 229920005989 resin Polymers 0.000 claims abstract description 90
- 239000011347 resin Substances 0.000 claims abstract description 90
- 238000002844 melting Methods 0.000 claims abstract description 44
- 230000008018 melting Effects 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 description 39
- 239000011888 foil Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- -1 polypropylene Polymers 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229920001903 high density polyethylene Polymers 0.000 description 5
- 239000004700 high-density polyethylene Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229920000092 linear low density polyethylene Polymers 0.000 description 4
- 239000004707 linear low-density polyethylene Substances 0.000 description 4
- 229920001179 medium density polyethylene Polymers 0.000 description 4
- 239000004701 medium-density polyethylene Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 229920005604 random copolymer Polymers 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012611 container material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 229920005680 ethylene-methyl methacrylate copolymer Polymers 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920006289 polycarbonate film Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
Landscapes
- Packages (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、易開封性密封容器に関するもので、より詳細
には、充填後のヒートシールが比較的広いヒートシール
条件範囲で行われ、しかも容器の中心側からの剥離強度
がレトルト殺菌等に耐える程大であり、且つ容器の外側
からの開封が手により確実に且つ安定に行い得るヒート
シール構造を有する易開封性密封容器に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an easily openable sealed container, and more specifically, the present invention relates to an easily openable sealed container, and more specifically, a container that can be heat-sealed after filling within a relatively wide range of heat-sealing conditions; The present invention relates to an easily openable sealed container which has a peel strength from the center side of the container that is high enough to withstand retort sterilization, etc., and has a heat-sealed structure that allows the container to be reliably and stably opened from the outside by hand.
（従来の技術）
従来、ヒートシール包装体は、食品包装等の多〈の分野
に広く使用されており、特にヒートシール界面で剥離可
能なものは、易開封性乃至ピーラブルなヒートシール蓋
としてやはり広く使用されている。(Prior art) Conventionally, heat-sealed packaging bodies have been widely used in many fields such as food packaging, and in particular those that can be peeled off at the heat-sealed interface are useful as easy-to-open or peelable heat-sealed lids. Widely used.
ヒートシール包装体の内、内容物にレトルト殺菌処理を
施したものでは、ヒートシール部のシール強度が２．３
に３７１５ｍｍ巾以上であることが義務づけられており
、容器本体と蓋とのシール強度がこの値に達すると、も
はや両者のヒートシール界面で手による剥離を行うこと
は困難となる。Among heat-sealed packages, the seal strength of the heat-sealed part is 2.3 for those whose contents have been subjected to retort sterilization treatment.
When the seal strength between the container body and the lid reaches this value, it becomes difficult to manually peel off the heat-sealed interface between the two.
この問題を解決するものとして、プラスチックス、第３
８＠第５号第６５頁（１９８７年）には容器本体内面全
体にヒートシール性内面材層を設け、そして、その内面
材層とその内側の層との間を易剥離性シール及び内面材
層と蓋とをタイトシールとすると共に、ヒートシール部
よりも中心側にこの内面材層を切断するスコアを設け、
中心側から外方へのヒートシール強度を２．３ Ｋｇ／
１５ｍｍ巾以上にしながら、外側からの開封を容易に行
えるようにしたヒートシール容器が既に提案されている
。As a solution to this problem, plastics,
8 @ No. 5, page 65 (1987), a heat-sealable inner material layer is provided on the entire inner surface of the container body, and an easily peelable seal and inner material are provided between the inner material layer and the inner layer. In addition to tightly sealing the layer and the lid, a score is provided for cutting this inner material layer closer to the center than the heat-sealed part.
The heat seal strength from the center to the outside is 2.3 Kg/
Heat-sealed containers have already been proposed that have a width of 15 mm or more and that can be easily opened from the outside.
本発明者等の提案にかかる特願昭８２−１２１１８５号
には、カップ状容器のフランジ部と蓋との間に中間材を
挿入し、中間材の一方の側に易剥離性シール及び他方の
側にタイトシールを形成すると共に、易剥離性シール部
の内周側端縁をタイトシール部の内周側端縁よりも容器
中心側に位置させることにより、容器の中心からの剥離
強度を容器の外側からの剥離強度よりも大きくすること
が提案されている。In Japanese Patent Application No. 82-121185 proposed by the present inventors, an intermediate material is inserted between the flange part and the lid of a cup-shaped container, and one side of the intermediate material has an easily peelable seal and the other side has an easily peelable seal. By forming a tight seal on the side of the container and locating the inner peripheral edge of the easily peelable seal part closer to the center of the container than the inner peripheral edge of the tight seal part, the peel strength from the center of the container can be reduced. It has been proposed to increase the peel strength from the outside.
（発明が解決しようとする問題点）
上述した易開封性ヒートシール容器のうち前者は、シー
ル強度を２．３ Ｋｇ／１５ｍｍ巾以上に保ちながら、
包装体に易開封性を賦与したものとして意義深いもので
あるが、容器にスコア加工を行わなければならない等、
容器の構成や製造に制約を受けることが問題である。ま
た、ヒートシール用周辺部の内側にスコア加工を行うた
めには、使用する容器素材に制限を受け、例えば鋼箔等
の金属箔を中間層とした積層容器では、スコア部での金
属露出を避けるために金属箔層より内側の樹脂層を厚く
する必要がある。また金属箔層を含まない場合でも、前
記スコアを設けるためには、必然的に容器フランジ部の
面積及び厚みが大きくなり、容器素材使用量の増大、包
装体の嵩の増大及び外観特性の点からも好ましくない。(Problems to be Solved by the Invention) Among the above-mentioned easy-to-open heat-sealed containers, the former has a sealing strength of 2.3 kg/15 mm or more while maintaining
Although it is significant because it makes the package easy to open, it requires score processing on the container, etc.
The problem is that there are restrictions on the structure and manufacturing of the container. In addition, in order to score the inside of the peripheral area for heat sealing, there are restrictions on the container material used. For example, in laminated containers with an intermediate layer of metal foil such as steel foil, it is difficult to expose the metal at the score area. To avoid this, it is necessary to make the resin layer inside the metal foil layer thicker. Furthermore, even if a metal foil layer is not included, in order to provide the above score, the area and thickness of the container flange inevitably increase, which increases the amount of container material used, increases the bulk of the package, and reduces the appearance characteristics. I don't like it either.
一方、前述した中間材を介してタイトシールと易剥離性
シールとを形成させる後者の容器の場合、上記のような
制約を受けないという利点があるが、ヒートシール条件
によってシール強度が変動するという問題を未だ有して
いる。例えば、易剥離性シールの場合、ヒートシール温
度の変化に係わらずシール強度を一定にすることは一般
に困難であり、シール温度が高くなると、シール強度が
増大する傾向がある。On the other hand, in the case of the latter container in which a tight seal and an easily peelable seal are formed through the intermediate material described above, there is an advantage that the above-mentioned restrictions are not imposed, but the seal strength varies depending on the heat sealing conditions. Still have problems. For example, in the case of easily peelable seals, it is generally difficult to maintain a constant seal strength regardless of changes in heat seal temperature, and as the seal temperature increases, the seal strength tends to increase.
また、このヒートシール構造では、例えば容器フランジ
と中間材との間に予めヒートシールを行い、内容物を容
器内に充填した後、中間材と蓋との間にヒートシール（
充填シール）を行うことが必要となる。この場合、先に
行われたヒートシール部（例えば易剥離性シール）のシ
ール強度が、後のヒートシールにより影響されるという
問題を生じる。In addition, in this heat-sealing structure, for example, heat-sealing is performed in advance between the container flange and the intermediate material, and after the contents are filled into the container, heat-sealing is performed between the intermediate material and the lid.
Filling and sealing) is required. In this case, a problem arises in that the seal strength of the previously heat-sealed portion (eg, easily peelable seal) is affected by the subsequent heat-seal.
一般に中間材を介しての二段シールの場合、中間材とフ
ランジとのヒートシールはシール条件を厳密に制御した
状態での操作が可能であることから易剥離性シールであ
ることが好ましく、一方、内容物が充填された後での中
間材と蓋とのシールは、内容物情下等の挟雑物がシール
界面に存在しても完全密封を行わねばならないことから
、タイトシールであることが望ましい。ところが、この
ようなタイトシールの形成は、蓋内面材或いは中間材の
樹脂層を外部に流出させて薄肉化を招き、また同時に易
剥離性シールに重大な熱影響を及ぼす、更に二重シール
構造に乱れを生じさせるという不都合を招きやすいので
ある。In general, in the case of two-stage sealing via an intermediate material, it is preferable to use an easily peelable seal because heat sealing between the intermediate material and the flange can be operated with strict control of sealing conditions; After the contents are filled, the seal between the intermediate material and the lid must be a tight seal, as it is necessary to ensure a complete seal even if there are foreign substances at the seal interface due to the contents. is desirable. However, the formation of such a tight seal causes the resin layer of the lid inner surface material or the intermediate material to flow out to the outside, resulting in thinning of the wall, and at the same time, it also has a serious thermal effect on the easily peelable seal, and furthermore, the double seal structure This tends to lead to inconveniences such as disturbances.
従って、本発明の目的は、前述した欠点が解消され、中
間材と容器フランジとの間に易剥離性シール及び中間材
と蓋との間にタイトシールが確実且つ安定に維持され°
ている易開封性密封容器及びその製法を提供するにある
。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned drawbacks, and to ensure that an easily peelable seal between the intermediate material and the container flange and a tight seal between the intermediate material and the lid are maintained reliably and stably.
An object of the present invention is to provide an easy-to-open sealed container and a method for manufacturing the same.
本発明の他の目的は、中間材と蓋との間の充填シールが
比較的低く且つ広い温度範囲でタイトシールとして行わ
れ、その結果として中間材と容器フランジとの間に形成
された易剥離性シールへの熱影響が著しく軽減され、し
かも充填シール時における蓋内面材及び中間材の流出・
薄肉化も防止された易開封性密封容器及びその製法を提
供するにある。Another object of the present invention is that the filling seal between the intermediate material and the lid is performed as a tight seal at a relatively low and wide temperature range, and as a result, the easy peeling formed between the intermediate material and the container flange is The heat effect on the seal is significantly reduced, and the inner lid material and intermediate material are prevented from flowing out and sealing during filling and sealing.
To provide an easily openable sealed container which is prevented from becoming thinner and a method for manufacturing the same.
（問題点を解決するための手段）
本発明によれば、ヒートシール用フランジを有するカッ
プ状容器と、樹脂内面材を有する蓋と、該フランジと蓋
との間の少なくとも開封開始部に挿入された樹脂中間材
との積層ヒートシール構造を有し、該フランジと中間材
との間に易剥離性シール及び蓋内面材と樹脂中間材との
間にタイトシールがそれぞれ形成され、該蓋内面材及び
樹脂中間材の少なくとも一方は、両者の界面側に、該蓋
内面材の融点及び樹脂中間材の融点の内低い方よりも更
に低い融点を有する低温シール性樹脂層を有することを
特徴とする易開封性密封性容器が提供される。(Means for Solving the Problems) According to the present invention, a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface material, and a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface, and a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface, and a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface, and a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface, and a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface, and a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface material, and a cup-shaped container having a heat-sealing flange; It has a laminated heat seal structure with a resin intermediate material, and an easily peelable seal is formed between the flange and the intermediate material, and a tight seal is formed between the lid inner material and the resin intermediate material, and the lid inner material and at least one of the resin intermediate material has a low-temperature sealing resin layer having a melting point lower than the lower of the melting point of the inner lid material and the melting point of the resin intermediate material on the interface side thereof. An easily openable hermetic container is provided.
本発明によればまた、ヒートシール用フランジを有する
カップ状容器のフランジ部に対して樹脂中間材をヒート
シールして易剥離性シールを形成させる工程と、この容
器に内容物を充填した後、樹脂内面材を有する蓋を施し
、蓋内面材と中間材とをヒートシールしてタイトシール
を形成させる工程とから成り、蓋内面材及び中間材の少
なくとも一方として、両者の界面側に蓋内面材の融点及
び樹脂中間材の融点の内低い方よりも更に低い融点を有
する低温シール性樹脂層を有するものを使用し、蓋側か
らの熱伝導により蓋内面材と中間材とのヒートシールを
行うことを特徴とする易開封性密封容器の製造方法が提
供される。According to the present invention, the step of heat-sealing a resin intermediate material to the flange portion of a cup-shaped container having a heat-sealing flange to form an easily peelable seal, and after filling the container with contents, The process consists of applying a lid having a resin inner surface material and heat-sealing the lid inner surface material and the intermediate material to form a tight seal. and the melting point of the resin intermediate material, whichever is lower, is used to heat seal the inner lid material and the intermediate material by heat conduction from the lid side. Provided is a method for manufacturing an easily openable sealed container characterized by the following.
（作 用）
本発明の容器では、フランジと蓋との間の少なくとも開
封開始部に中間材を介在させ、フランジと中間材との間
に易剥離性シール及び蓋内面材と中間材との間にタイト
シールを形成させるが、蓋内面材（Ａ）及び中間材（Ｂ
）の少なくとも一方に、しかも両者の界面側に、蓋内面
劇の融点（ＭＡ）及び中間材の融点（Ｍ５）の内低い方
の融点よりも更に低い融点（ＭＣ）を有する低温シール
性樹脂層（Ｃ）を設けることに顕著な特徴を有するもの
である。(Function) In the container of the present invention, an intermediate material is interposed between the flange and the lid at least at the opening start part, an easily peelable seal is provided between the flange and the intermediate material, and an easily peelable seal is provided between the lid inner material and the intermediate material. A tight seal is formed between the lid inner material (A) and the intermediate material (B).
), and also on the interface side between the two, a low-temperature sealing resin layer having a melting point (MC) lower than the lower of the melting point (MA) of the inner surface of the lid and the melting point (M5) of the intermediate material. It has a remarkable feature in providing (C).
即ち、本発明で用いる低温シール性樹脂層（Ｃ）は、式
％式％（１）
の両方を満足する融点を有するものであり、当然のこと
ながら、低温シール性樹脂層（Ｃ）は蓋内面材（Ａ）に
対しても、また中間材樹脂（Ｂ）に対してもヒートシー
ル可能なものでなければならない。That is, the low-temperature sealing resin layer (C) used in the present invention has a melting point that satisfies both the formula (%) and the formula (1). It must be heat-sealable to both the inner surface material (A) and the intermediate resin (B).
中間材と蓋内面材とのヒートシールを考えると、加熱に
より両樹脂の少なくとも一方が溶融され且つ両者が圧接
されてヒートシールが形成される。両樹脂の加熱と共に
熱伝導により中間材とフランジとの間に設けられた易剥
離性シール部も当然加熱される。When considering heat sealing between the intermediate material and the lid inner material, at least one of the two resins is melted by heating, and the two are pressed together to form a heat seal. Naturally, as both resins are heated, the easily peelable seal portion provided between the intermediate material and the flange is also heated due to heat conduction.
この場合、中間材と蓋内面材との界面での時間的な温度
上昇及び中間材とフランジとの界面での時間的な温度上
昇を実際に測定すると、第１図に示すように前者の界面
での温度上昇速度は後者の界面でのそれに比して大きく
、且つ両者の樹脂の内の融点の低い方の樹脂の融点乃至
それより若干高い温度（Ｔｔ）で飽和し、後者の界面で
もこの飽和温度よりも低く、熱伝導性乃至温度勾配に応
じて一定の対応する温度（”ｒｐ）で飽和する傾向が肥
められる。In this case, when we actually measure the temperature rise over time at the interface between the intermediate material and the inner lid material, and the temperature rise over time at the interface between the intermediate material and the flange, we find that the former interface The rate of temperature increase at the latter interface is greater than that at the latter interface, and saturates at a temperature (Tt) that is at or slightly higher than the melting point of the lower melting point of the two resins; The tendency to saturate at a constant corresponding temperature ("rp") below the saturation temperature is enhanced depending on the thermal conductivity or temperature gradient.
また、中間材と蓋内面材との加熱に際しては、それぞれ
の融点近傍を境として、それ以上では蓋内面材乃至中間
材が流動し、ヒートシール部の外へのはみ出しを生ずる
。また、このはみ出しによる蓋内面材乃至中間材の薄肉
化に伴って、易剥離性シール部に対する熱影響が強くな
る。Further, when heating the intermediate material and the inner lid material, the inner material of the lid or the intermediate material flows beyond the melting point of each material, causing the inner material of the lid or the intermediate material to flow and protrude outside of the heat-sealed portion. Further, as the lid inner surface material or the intermediate material becomes thinner due to this protrusion, the thermal influence on the easily peelable seal portion becomes stronger.
本発明においては、前記式（１）及び（２）を満足する
融点（ＭＣ）を有する低温シール性樹脂層を、蓋内面材
と樹脂中間材との間に介在させることにより、蓋内面材
の融点（ＭＡ）や中間材の融点（Ｍ８）よりも低い温度
に飽和温度（Ｔ、）を設定でき、これに応じて、易剥離
性シール部の飽和温度（ＴＰ）も低くすることができる
。このため、蓋内面材及び中間材の流出による薄肉化も
防止でき、その結果として、充填シール時の易剥離性シ
ール部に対する熱の影響を著しく軽減できる。In the present invention, a low-temperature sealing resin layer having a melting point (MC) that satisfies the above formulas (1) and (2) is interposed between the lid inner material and the resin intermediate material. The saturation temperature (T, ) can be set at a temperature lower than the melting point (MA) or the melting point (M8) of the intermediate material, and the saturation temperature (TP) of the easily peelable seal portion can be lowered accordingly. Therefore, thinning due to outflow of the inner lid material and the intermediate material can be prevented, and as a result, the influence of heat on the easily peelable seal portion during filling and sealing can be significantly reduced.
蓋内面材と樹脂中間材とは別に低温シール性樹脂層を用
いることも重要であり、蓋内面材全体が低温シール性樹
脂から成る場合には、タイトシールを形成し始める充填
シール温度よりわずかに高い温度となると、蓋内面材が
流動薄肉化し、これに伴って、易剥離性シール部に対す
る熱の影響が大きくなる。また、蓋内面材が流動薄肉化
したために、開封時などに蓋内面材と基材との間で比較
的小さい力で剥離が生じるようになる。また、樹脂中間
材全体が低温シール性樹脂から成る場合にも、同様にし
てヒートシール時に樹脂の流動薄肉化が生じると共に、
易剥離性シール部に対する熱の影響が大きくなる。It is also important to use a low-temperature sealing resin layer separately from the lid inner material and the resin intermediate material, and if the entire lid inner material is made of low-temperature sealing resin, the temperature should be slightly lower than the filling seal temperature at which a tight seal begins to form. When the temperature becomes high, the inner surface material of the lid flows and becomes thinner, and as a result, the influence of heat on the easily peelable seal portion increases. Furthermore, since the inner lid material has become fluid and thinner, peeling occurs between the inner lid material and the base material with a relatively small force when opening the package. In addition, when the entire resin intermediate material is made of low-temperature sealing resin, the resin flows and becomes thinner during heat sealing, and
The effect of heat on the easily peelable seal portion increases.
本発明によれば、かくして、容器と蓋とのヒートシール
を完全な形で行いながら、しかもタイトシールと易剥離
性シールとを確実に行うことが可能となるものである。According to the present invention, it is thus possible to completely heat-seal the container and the lid while also reliably achieving a tight seal and an easily peelable seal.
（発明の好適態様）
本発明の易開封性密封容器を、各ヒートシールすべき部
分で分解して示す第２図において、この密封容器は、容
器本体１、蓋２及び中間材３から構成される。容器本体
１はヒートシール用フランジ４を有し、Ｍ２は基材５ａ
と樹脂内面材５とから構成される。この具体例では、中
間材３は、中間材本体６、フランジ４との間に易開封性
シール部を形成させるための凝集破壊シール性樹脂層７
及び低温シール性樹脂層８の積層体から成っている。(Preferred Embodiment of the Invention) In FIG. 2, which shows the easy-open sealed container of the present invention disassembled with each part to be heat-sealed, the sealed container is composed of a container body 1, a lid 2, and an intermediate material 3. Ru. The container body 1 has a heat sealing flange 4, and M2 is a base material 5a.
and a resin inner material 5. In this specific example, the intermediate material 3 has a cohesive failure sealing resin layer 7 for forming an easily openable seal portion between the intermediate material body 6 and the flange 4.
and a laminate of a low-temperature sealing resin layer 8.
第２図に示す容器の各部材間でシールが行われた状態を
示す第３図において、シートシール用フランジ４と中間
材３とは、凝集破壊シール性樹脂層７を介しての易剥離
性シール９が行われており、一方蓋２と中間材３とは、
低温シール性樹脂層８を介してのタイトシール１０が行
われている。In FIG. 3, which shows a state in which sealing is performed between each member of the container shown in FIG. A seal 9 is being performed, while the lid 2 and the intermediate material 3 are
Tight sealing 10 is performed via a low-temperature sealing resin layer 8.
易！１ＩＩＩｌＩ性シール部９の内側端縁１１はタイト
シール部ｌＯの内側端縁１２よりも容器の内側に位置し
ており、開封開始位置１３において易開封性シール部９
の外側端縁１４はタイトシール部１０の外側端縁１５よ
りも容器内側に位置しているか或いは同じ位置にある。Easy! The inner edge 11 of the easy-to-open seal part 9 is located inside the container than the inner edge 12 of the tight-seal part 10, and the easy-to-open seal part 9 is located at the opening start position 13.
The outer edge 14 of the tight seal portion 10 is located further inside the container than the outer edge 15 of the tight seal portion 10, or is located at the same position as the outer edge 15 of the tight seal portion 10.
この密封部に内側からの剥離力が作用している状態を示
す第４図においては、易剥離性シール部９の内側端縁１
１はタイトシール部１０の内側端縁１２よりも容器の内
側に位置しており、したがって内側からの剥離力あるい
は破壊力Ｐはタイトシール部１０に作用し、例えば２．
３ｋｇ／１５＋ｎｍ巾以上のような大きい剥離あるいは
破壊強度がえられる。In FIG. 4, which shows a state in which a peeling force is applied from the inside to this sealing part, the inner edge 1 of the easily peelable sealing part 9 is
1 is located further inside the container than the inner edge 12 of the tight seal portion 10, and therefore, the peeling force or breaking force P from the inside acts on the tight seal portion 10. For example, 2.
A large peel or break strength such as 3 kg/15+nm width or more can be obtained.
一方、この密封部の開封開始位置１３に外側からの剥離
力Ｐ゛が作用している状態を示す第５図において、蓋２
の端部１７を把持して上方に引き上げると、剥離力Ｐ°
は易剥離性シール部９の外側端縁１４に集中し、手によ
る開封開始が確実且つ安定に行われ、しかも外側からの
剥離強度をも２ｋｇ／１５ｍｍ巾以下の易剥離性シール
の範囲にすることができる。また、開封開始を確実且つ
安定に行うための容器の形態は、第５図に示した形態に
限らず、中間材を把持部として蓋と共に突出させた第８
図に示す形態、及び易剥離性シールの外側端縁１４より
内側のフランジ外面側にフランジを切断するためのスコ
ア１８を刻切させた第９図に示す形態などが好適に適用
される。On the other hand, in FIG. 5, which shows a state in which a peeling force P' from the outside is applied to the opening start position 13 of the sealing part, the lid 2
When gripping the end 17 of and pulling it upward, the peeling force P°
is concentrated on the outer edge 14 of the easily peelable seal part 9, so that opening by hand can be started reliably and stably, and the peel strength from the outside is also within the range of an easily peelable seal of 2 kg/15 mm width or less. be able to. In addition, the form of the container for starting the opening reliably and stably is not limited to the form shown in FIG.
The form shown in the figure and the form shown in Fig. 9 in which a score 18 for cutting the flange is cut on the outer surface of the flange inside the outer edge 14 of the easily peelable seal are preferably applied.
第２図において、中間材３に低温シール性樹脂層８を設
ける代りに、第６図に示す通り、蓋内面材５にヒートシ
ール性樹脂層８ａを設けても良く、また第７図に示す通
り、蓋内面材５と中間材３との両方にヒートシール性樹
脂層８ａ、８ｂを設けてもよい。尚、凝集破壊シール性
樹脂層７は必ずしも必要でなく、要は中間材３とフラン
ジ４との間に前述した範囲の易開封性シールが形成され
ればよい。In FIG. 2, instead of providing the low-temperature sealing resin layer 8 on the intermediate material 3, a heat-sealing resin layer 8a may be provided on the inner lid material 5 as shown in FIG. 6, or as shown in FIG. Alternatively, the heat-sealable resin layers 8a and 8b may be provided on both the lid inner material 5 and the intermediate material 3. Incidentally, the cohesive failure sealing resin layer 7 is not necessarily necessary, and the point is that an easily openable seal within the above-mentioned range may be formed between the intermediate material 3 and the flange 4.
容器本体、蓋はそれ自体公知の任意の容器形成素材、例
えば樹脂、金属、紙、ガラス、セラミック或いはそれら
の積層体から形成されていることができる。好適な容器
本体、蓋は少なくとも内面が中間材とヒートシール性を
有する樹脂からなるものであり、例えば、これに限定さ
れるものではないが、低−中一高密度ポリエチレン、ア
イツタクチイックポリプロピレン、プロピレン−エチレ
ン共重合体、エチレン−酢酸ビニル共重合体、エチレン
系不飽和カルボン酸乃至その無水物でグラフト変性され
たオレフィン樹脂等のオレフィン系樹脂；比較的低融点
乃至低軟化点のポリアミド乃至コポリアミド樹脂；比較
的低融点乃至低軟化点のポリエステル乃至コポリエステ
ル樹脂：ポリカーボネート樹脂などから成るものである
。The container body and lid may be made of any container-forming material known per se, such as resin, metal, paper, glass, ceramic, or a laminate thereof. Suitable container bodies and lids have at least the inner surface made of an intermediate material and a resin having heat-sealing properties, such as, but not limited to, low to medium high density polyethylene, tactical polypropylene, Olefin resins such as propylene-ethylene copolymers, ethylene-vinyl acetate copolymers, olefin resins graft-modified with ethylenically unsaturated carboxylic acids or their anhydrides; polyamides or copolymers with relatively low melting or softening points; Polyamide resin; polyester or copolyester resin having a relatively low melting point or low softening point; polycarbonate resin, etc.
容器本体は、これらの樹脂単独から形成された容器であ
ってもよいし、アルミ、鋼、ブリキ等の金属箔を中間層
として含む積層容器であってもよい。また、これらの金
属素材に熱硬化性樹脂、熱可塑性樹脂等それ自体公知の
樹脂被覆を施したいわゆる公知の金属製容器であっても
よい。The container body may be a container formed from these resins alone, or may be a laminated container including a metal foil such as aluminum, steel, tin plate, etc. as an intermediate layer. Further, it may be a so-called well-known metal container in which these metal materials are coated with a resin known per se such as a thermosetting resin or a thermoplastic resin.
蓋体は、アルミ箔、スズ箔、鋼箔、ブリキ箔等の金属箔
や、エチレン−ビニルアルコール共重合体、塩化ビニリ
デン樹脂、ナイロン樹脂等の高酸素バリヤー性樹脂フィ
ルム、二軸延伸ポリエチレンテレフタレートフィルム、
二軸延伸ナイロンフィルム、ポリカーボネートフィルム
等の熱可塑性樹脂フィルム、各種紙載いは更にこれらの
ラミネート等を基材とし、これに前述したヒートシール
性樹脂層（Ａ）を内面材として積層したものである０Ｍ
内面材としては、そのトータル厚みが、２５乃至１００
μｍ、特に３０乃至８０μｍの範囲にあるものが、一般
に使用される。The lid can be made of metal foil such as aluminum foil, tin foil, steel foil, or tin foil, high oxygen barrier resin film such as ethylene-vinyl alcohol copolymer, vinylidene chloride resin, or nylon resin, or biaxially oriented polyethylene terephthalate film. ,
The base material is a thermoplastic resin film such as a biaxially oriented nylon film, a polycarbonate film, various types of paper, or a laminate thereof, and the above-mentioned heat-sealable resin layer (A) is laminated thereon as an inner material. Some 0M
The total thickness of the inner material is 25 to 100 mm.
μm, especially those in the range 30 to 80 μm, are commonly used.
中間材本体（Ｂ）は、前述したヒートシール性樹脂の一
層または二層以上からなるフィルムであって、その厚み
は少なくとも開封、殺菌工程、落下衝撃などに伴う力に
耐えるもにでなければならず、一般に１５乃至３００μ
ｍ１特に３０乃至１００μｍの範囲にあるものが望まし
い。The intermediate material main body (B) is a film made of one or more layers of the heat-sealable resin described above, and its thickness must be at least strong enough to withstand the forces associated with opening, sterilization, dropping impact, etc. Generally 15 to 300μ
It is particularly desirable that m1 be in the range of 30 to 100 μm.
低温シール性樹脂層（Ｃ）は、既に述べた通り、前記樹
脂（Ａ）及び（Ｂ）の融点の内低いものより更に低い融
点を有するものである。特に挟雑シール等を考慮した一
般的ヒートシール条件に関連して、少なくとも１０℃低
い融点を有する樹脂層（Ｃ）を用いる場合には、本発明
の効果が顕著となる。 樹脂層（Ｃ）の融点の調節は、
樹脂を製造するときの重合方式乃至共重合方式を選ぶか
、また共単量体の量を選ぶことにより行われる。一般に
、重合体の密度を低くすると融点は低くなり、高密度ポ
リエチレン（ＨＤＰＥ）と低密度ポリエチレン（ＬＤＰ
Ｅ）とがその例である。As already mentioned, the low-temperature sealing resin layer (C) has a melting point lower than the lower of the melting points of the resins (A) and (B). In particular, the effect of the present invention becomes remarkable when a resin layer (C) having a melting point lower by at least 10° C. is used in relation to general heat sealing conditions that take into account rough sealing and the like. Adjustment of the melting point of the resin layer (C) is as follows:
This is done by selecting the polymerization method or copolymerization method used when producing the resin, or by selecting the amount of comonomer. Generally, the lower the density of the polymer, the lower the melting point; high density polyethylene (HDPE) and low density polyethylene (LDP)
E) is an example.
また、ホモ重合体に対して成る量の共単量体を共重合せ
しめた共重合体では融点は低くなり、ホモポリプロピレ
ン（ｐｐ）に対するプロピレン−エチレン共重合体（Ｐ
ＰＥ）がこの例である。また、同じ共重合体であっても
、ブロック共重合体に比してランダム共重合体では融点
が低くなり、プロピレン−エチレンブロック（Ｂ）共重
合体とランダム（Ｒ）共重合体とがその例である。勿論
、本発明に用いる低温シール性樹脂は、タイトシールを
形成し得るという条件を満足するものでなければならな
い。In addition, the melting point of a copolymer made by copolymerizing the same amount of comonomer as that of a homopolymer is lower, and the melting point of a copolymer is lower than that of a propylene-ethylene copolymer (P) compared to homopolypropylene (PP).
PE) is an example of this. Furthermore, even if the copolymers are the same, random copolymers have lower melting points than block copolymers, and propylene-ethylene block (B) copolymers and random (R) copolymers have lower melting points than block copolymers. This is an example. Of course, the low-temperature sealing resin used in the present invention must satisfy the condition that it can form a tight seal.
適当な内面材／低温シール性樹脂／中間材の例は、これ
に制限されないが次の通りである。Examples of suitable inner material/low temperature sealing resin/intermediate material include, but are not limited to, the following.
ＨＰＰ又はＢ Ｐ Ｐ Ｅ／Ｒ−Ｐ Ｐ Ｅ／ＨＰ Ｐ
又はＢＰＰＥ、ＨＤＰＥ又はＭＤＰＥ／ＬＤＰＥ。HPP or B P P E/R-P P E/HP P
or BPPE, HDPE or MDPE/LDPE.
ＬＬＤＰＥ、ＥＶＡ、ＥＡＡ、ＩＯＮＯＭＥＲ又はＥＭ
Ａ／ＨＤＰＥ又はＭＤＰＥ；
ここで、ＭＤＰＥは中密度ポリエチレン、ＬＬＤＰＥは
リニア低密度ポリエチレン、ＥＶＡはエチレン−酢酸ビ
ニル共重合体、ＥＡＡはエチレン−アクリル酸共重合体
、ＨＭＡはエチレン−メタクリル酸メチル共重合体を示
す。LLDPE, EVA, EAA, IONOMER or EM
A/HDPE or MDPE; Here, MDPE is medium density polyethylene, LLDPE is linear low density polyethylene, EVA is ethylene-vinyl acetate copolymer, EAA is ethylene-acrylic acid copolymer, and HMA is ethylene-methyl methacrylate copolymer. Indicates a polymer.
低温シール性樹脂層を蓋内面材乃至中間材に設ける方法
としては、一般に蓋内面材乃至中間材を製膜するときに
低温シール性樹脂を共押出しする方法や、予め製膜した
蓋内面材乃至中間材に低温シール性樹脂をヒートラミネ
ーション乃至押出しコーティングする方法などが好適に
適用される。As a method for providing a low-temperature sealing resin layer on the inner lid material or intermediate material, there is generally a method of co-extruding a low-temperature sealing resin when forming the inner lid material or intermediate material, or a method of coextruding a low-temperature sealing resin layer on the inner lid material or intermediate material that has been formed in advance. A method of heat lamination or extrusion coating of a low-temperature sealing resin on the intermediate material is preferably applied.
低温シール性樹脂層は、蓋内面材に対して小さい厚みを
有するべきであり、一般に１乃至５０μｍ、特に５乃至
３０μｍで且つ蓋内面材の１／２以下、特に２１５以下
の厚みを有するのが好ましい。The low-temperature sealing resin layer should have a small thickness relative to the lid inner material, and should generally have a thickness of 1 to 50 μm, particularly 5 to 30 μm, and a thickness of 1/2 or less of the lid inner material, particularly 215 μm or less. preferable.
凝集破壊シール性樹脂層としては、例えば複数種の樹脂
のブレンド物が使用され、例えばポリプロピレン系樹脂
にポリエチレンをブレンドし、必要によりＥＰＲ等のゴ
ム系相溶化剤を配合したものが使用される。As the cohesive failure sealing resin layer, for example, a blend of multiple types of resins is used, such as a blend of polypropylene resin with polyethylene and, if necessary, a rubber compatibilizer such as EPR.
本発明における中間材を挿入したヒートシール構造は、
容器と蓋との密封郡全体にわたって設けてよいのは勿論
であるが、ヒートシール構造では、−旦成る長さの剥離
が行われると、その後の剥離は比較的容易に進行するこ
とから、密封部の剥離開始部分にのみ設けてもよいこと
が理解されるべきである。The heat seal structure in which an intermediate material is inserted in the present invention is as follows:
Of course, it is possible to provide a seal over the entire area between the container and the lid, but in a heat seal structure, once a certain length of peeling is performed, subsequent peeling progresses relatively easily. It should be understood that it may be provided only at the beginning of peeling of the section.
また、本発明における容器はカップ状容器に限定される
べきものではなく、応用として袋状の密封容器、いわゆ
るレトルトパウチに対しても、本発明が適用できること
が理解されるべきである。Furthermore, it should be understood that the container in the present invention is not limited to a cup-shaped container, and that the present invention can also be applied to a bag-shaped sealed container, a so-called retort pouch.
（発明の効果）
本発明によれば、蓋内面材及び樹脂中間材の少なくとも
一方に、両者の界面側に位置するように該蓋内面材の融
点及び樹脂中間材の融点の内低い方よりも更に低い融点
を有する低温シール性樹脂層を設けることにより、中間
材と容器フランジとの間に易剥離性シール及び中間材と
蓋との間にタイトシールが確実且つ安定に維持されてい
る易開封性密封容器が提供された。(Effects of the Invention) According to the present invention, at least one of the lid inner material and the resin intermediate material has a melting point lower than the lower of the melting point of the lid inner material and the resin intermediate material so as to be located on the interface side between the two. Furthermore, by providing a low-temperature sealing resin layer with a low melting point, an easy-to-open seal is created in which an easily peelable seal is maintained between the intermediate material and the container flange, and a tight seal is reliably and stably maintained between the intermediate material and the lid. A sealed container was provided.
また、中間材と蓋との間の充填シールが比較的低い温度
でタイトシールとして行われ、その結果として中間材と
容器フランジとの間に形成された易剥離性シールへの熱
影響が著しく軽減され、しかも充填シールに伴う中間材
の流出・薄肉化も防止された。In addition, the filling seal between the intermediate material and the lid is performed as a tight seal at a relatively low temperature, and as a result, the thermal effect on the easily peelable seal formed between the intermediate material and the container flange is significantly reduced. Moreover, the leakage and thinning of the intermediate material caused by filling and sealing were also prevented.
本発明を次の例で説明する。The invention is illustrated by the following example.
（実施例）
１２μｍの二軸延伸ポリエチレンテレフタレートフィル
ムと７μｍの軟質アルミニウム箔をウレタン系接着剤で
積層した基材のアルミニウム側に、ヒートシール性内面
材として単層或いは多層のフィルムをウレタン系接着剤
で貼り合せた、表１に示す蓋材を準備した。(Example) A single layer or multilayer film is applied as a heat-sealable inner material to the aluminum side of a base material in which a 12 μm biaxially stretched polyethylene terephthalate film and a 7 μm soft aluminum foil are laminated with a urethane adhesive. A lid material shown in Table 1 was prepared.
カップ状容器として、７５μｍの表面処理鋼箔の片面に
４０μｍ及び他面に７０μｍの無延伸ポリプロピレンフ
ィルムをウレタン系接着剤で積層し、次に、この積層体
を７０μｍのフィルム側がヒートシール面となるように
深絞り成形し、さらに、ヒートシール用フランジ（外径
７５ｍｍ、内径６５ｍａ＋）を形成させた深さ３０ｍｍ
の円形容器を準備した。As a cup-shaped container, a 75 μm surface-treated steel foil is laminated with a 40 μm unstretched polypropylene film on one side and a 70 μm unstretched polypropylene film on the other side with a urethane adhesive, and then the 70 μm film side of this laminate becomes the heat sealing surface. Deep drawing molded as shown, and further formed with a heat sealing flange (outer diameter 75mm, inner diameter 65mm+) to a depth of 30mm.
A circular container was prepared.
中間材として、エチレン含有率４％のプロピレン−エチ
レンランダム共重合体にリニア低密度ポリエチレンを３
５重量％をブレンドした凝集破壊シール性層を有する表
２に示すフィルムを準備した。As an intermediate material, 3% linear low density polyethylene was added to a propylene-ethylene random copolymer with an ethylene content of 4%.
A film shown in Table 2 having a cohesive failure sealing layer blended with 5% by weight was prepared.
前記カップ状容器と表１で示した蓋材及び表２で示した
中間材を用いて、表３に示す組合せで密封容器を次の手
順で作製した。Using the cup-shaped container, the lid material shown in Table 1, and the intermediate material shown in Table 2, a sealed container was produced using the combination shown in Table 3 according to the following procedure.
先ず、中間材の原反フィルムより前記カップ状容器のヒ
ートシール用フランジ面を覆い得る周状のフィルムを切
出し、容器のヒートシール用フランジ面と凝集破壊シー
ル性層とを、１８０℃−１，０秒の条件で熱接着（易剥
離性シール）した。First, a circumferential film that can cover the heat-sealing flange surface of the cup-shaped container is cut out from a raw film as an intermediate material, and the heat-sealing flange surface of the container and the cohesive failure sealing layer are heated at 180° C.-1. Thermal bonding (easily peelable seal) was performed under the condition of 0 seconds.
こうして得られた容器にミートボールを６ケ充填し、こ
の容器に施すべき蓋材をヒートシールした。Six meatballs were filled in the container thus obtained, and a lid material to be applied to the container was heat-sealed.
充填シール時のヒートシール条件は、ヒートシール時間
を１．５秒とし、ヒートシール圧力を１００Ｋｇとした
。また、ヒートシール温度（ヒートシールヘッドの温度
）については、−回のヒートシールで中間材と蓋材との
シール強度がタイトシールとなる温度、この場合２．３
ｋｇ／１５ｍｍ巾となる温度を予めもとめ、この温度と
これより１０℃高い温度の２条件とした。なお、ヒート
シールは二回シールとした。The heat sealing conditions during filling and sealing were a heat sealing time of 1.5 seconds and a heat sealing pressure of 100 kg. In addition, the heat sealing temperature (temperature of the heat sealing head) is the temperature at which the seal strength between the intermediate material and the lid material becomes a tight seal after - times of heat sealing, in this case 2.3
The temperature at which the width of kg/15 mm is obtained was determined in advance, and two conditions were set: this temperature and a temperature 10° C. higher than this temperature. Note that heat sealing was performed twice.
易剥離性シール部及びタイトシール部は、円形のヒート
シール用フランジの外径と同心円となるようにヒートシ
ールヘッドの形状と位置を規制してヒートシールを行っ
た。このとき、易剥離性シール部の内径及び外径を６６
ｍｍ及び７３ｍ−とし、タイトシール部の内径及び外径
を６９ｍｍ及び７５ｍｍとした。さらに、開封開始部に
おいては中間フィルムを蓋と共に把持部となるように突
出させた。The easily peelable seal portion and the tight seal portion were heat sealed by regulating the shape and position of the heat seal head so that they were concentric with the outer diameter of the circular heat sealing flange. At this time, the inner and outer diameters of the easily peelable seal part are set to 66 mm.
mm and 73 m-, and the inner diameter and outer diameter of the tight seal portion were 69 mm and 75 mm. Furthermore, at the opening start part, the intermediate film was made to protrude together with the lid to serve as a grip part.
このようにして得られた密封充填容器の開封力（開封初
期の最大開封強度）及び容器内側からのシール強度（剥
離強度乃至破壊強度）を１２０℃−３０分のレトルト殺
菌後に引張試験機を用いて測定した。開封強度の測定は
クロスヘツドに容器を４５°傾けて固定し、蓋及び中間
材の開封用の把持部を同時に上のチャックにはさみ（容
器の上面と把持部とをなす角が４５°となった状態）、
３００ ｍｍ１分の速度で上下に引っ張って行った。The opening force (maximum opening strength at the initial stage of opening) and the sealing strength from the inside of the container (peel strength to breaking strength) of the sealed filled container thus obtained were measured using a tensile tester after retort sterilization at 120°C for 30 minutes. It was measured using To measure the opening strength, the container was fixed at a 45° tilt on the crosshead, and the gripping part for opening the lid and intermediate material was simultaneously held in the upper chuck (the angle between the top surface of the container and the gripping part was 45°). situation),
It was pulled up and down at a speed of 300 mm/min.
また、シール強度の測定はヒートシールの方向に対し直
角に１５ｍｌ１１巾の短冊を切出し、短冊の蓋材側を上
のチャックにカップの側壁側を下のチャックにはさみ、
３００ＩＩｌｒｎ／分の速度で上下に引っ張って行った
。開封力については値のばらつきが少なっかたので、そ
の平均値を表３に示す。また、蓋材のアルミニウム箔と
内面材との間が開封終了時に剥離した割合Ｐｄ、開封時
に蓋材が破断してしまった割合Ｐｂ、およびシール強度
が２．３ｋｇ７１５ｍｍ巾以下となった割合Ｐｓを表３
に示す。To measure the seal strength, cut out a 15ml 11-width strip perpendicular to the direction of the heat seal, and place the lid side of the strip into the upper chuck and the side wall side of the cup into the lower chuck.
It was pulled up and down at a speed of 300 II lrn/min. Regarding the opening force, since there was little variation in the values, the average values are shown in Table 3. In addition, the percentage Pd of peeling between the aluminum foil of the lid material and the inner material after opening, the percentage Pb of the lid breaking when opened, and the percentage Ps of sealing strength below 2.3 kg and 715 mm width. Table 3
Shown below.
ΔＴが十分に大きい実施例２〜７では開封力が２．０ｋ
ｇ前後の値を示すと共に、ヒートシール温度が１０℃違
フていても、開封力の差は０．１ｋｇと小さかった。こ
れより、実用の範囲ではヒートシール温度が多少変動し
てもよいことが分った。ΔＴが比較的小さい実施例１で
は比較例１と比較した場合、開封力が低減されるという
本発明の効果が現われているものの、ヒートシール温度
の変動に対する効果が弱められていた。In Examples 2 to 7 where ΔT is sufficiently large, the opening force is 2.0 k.
The difference in opening force was as small as 0.1 kg even though the heat sealing temperature was different by 10°C. From this, it was found that the heat sealing temperature may vary somewhat within the practical range. In Example 1, in which ΔT is relatively small, when compared with Comparative Example 1, although the effect of the present invention of reducing the opening force appeared, the effect against fluctuations in heat sealing temperature was weakened.
一方、比較例では開封力が高く、ヒートシール温度の違
うことによる差は０．２〜０．４ ｋｇと、影響が強く
現われていた。なかでも、蓋内面材がブロックコポリマ
ー単層からなる蓋材Ａを使用すると共に、低温シール性
樹脂層を有していない中間材りを使用した比較例１では
、ヒートシール温度を高く設定しなければならず、開封
力が最も高くなった。また、開封時に蓋材が破断してし
まったものがあった。これは易剥離性シール強度が高く
なったことと、蓋内面材が薄肉化したことに関連して、
蓋材の材料強度が足りなくなったことが原因したと考え
られる。On the other hand, in the comparative example, the opening force was high, and the difference due to the difference in heat sealing temperature was 0.2 to 0.4 kg, which showed a strong influence. In particular, in Comparative Example 1, in which the lid material A was made of a block copolymer single layer as the lid inner material, and an intermediate material without a low-temperature sealing resin layer was used, the heat sealing temperature had to be set high. As expected, the opening force was the highest. In addition, there were cases where the lid material broke when the package was opened. This is due to the increased strength of the easily peelable seal and the thinner lid inner material.
The cause is thought to be that the material strength of the lid material was insufficient.
また、蓋内面材がランダムコポリマー単層からなる蓋材
Ｂを使用した比較例２および３では、蓋材アルミニウム
箔と内面材との間が剥離し易く、Ｐｄ及びＰｓが高い値
を示した。そこで、シール部の断面を観察したところ、
蓋内面材の厚みが１／４以下に薄肉化するとともに、中
間材も薄肉化していた。Furthermore, in Comparative Examples 2 and 3 in which the lid material B was made of a random copolymer single layer, the lid material aluminum foil and the inner surface material were likely to peel off, and Pd and Ps showed high values. Therefore, when we observed the cross section of the seal part, we found that
The thickness of the inner lid material was reduced to 1/4 or less, and the intermediate material was also reduced in thickness.
主材層がランダムコポリマーからなる中間材Ｋを使用し
た比較例４及び５では、シール強度が２．３ ｋｇ７１
５ｍｍ巾以下となっ巾側下Ｐｓが高かった。In Comparative Examples 4 and 5, in which the main material layer used intermediate material K consisting of a random copolymer, the seal strength was 2.3 kg71
The width was 5 mm or less, and the lower width Ps was high.
融点の定義
本発明において融点とは、加熱速度条件を毎分１０℃と
する示差走査熱量測定（ＤＳＣ）で得られる融解ピーク
温度を意味する。また、対象とする樹脂がブレンド物か
らなる場合には、マトリックスとなっている樹脂の融解
ピーク温度をその樹脂の融点とする。また、同一の樹脂
が２つ以上の融解ピーク温度をもつときには、融解ピー
ク面積の最も広いピーク温度を融点とする。Definition of Melting Point In the present invention, the melting point refers to the melting peak temperature obtained by differential scanning calorimetry (DSC) at a heating rate of 10° C./min. Furthermore, when the target resin is a blend, the melting peak temperature of the resin forming the matrix is taken as the melting point of the resin. Furthermore, when the same resin has two or more melting peak temperatures, the peak temperature with the widest melting peak area is taken as the melting point.
第１図は蓋内面材と中間材との界面及び中間材カップと
の界面における充填シール時の温度変化を例示した図で
あり、第２図、第６図及び第７図は本発明の易剥離性密
封容器を蓋材、中間材及びカップ状容器の各部材に分解
した図であり、第３図は第２図で示した部材をソールし
た状態を例示した図であり、第４図は第３図で示した容
器の密封部に内側からの剥離力が作用した状態を例示し
た図であり、第５図はこの容器に開封力が作用した状態
を例示した図であり、第８図及び第９図は本発明に適用
される容器の形態を例示した図である。
スコアを示す。
引照数字１は容器本体、２は蓋、
４はヒートシール用フランジ、５
５は蓋内面材、６は中間材本体、
シール性層、８は低温シール性層、
シール部、１０はタイトシール部、
始位置、１７は開封用の把持部、１
３は中間材、
ａは蓋基材、
７は凝集破壊
９は易剥離性
１３は開封用
８は開封用の
第１図
＋
ｔＨ
吟 開
ｔＨ：ヒートシー）し吟問
１’Ｎ
第
図FIG. 1 is a diagram illustrating temperature changes during filling and sealing at the interface between the lid inner material and the intermediate material and the interface between the intermediate material cup, and FIGS. FIG. 3 is an exploded view of the releasable sealed container into the lid material, intermediate material, and cup-shaped container; FIG. 3 is a diagram illustrating the sole state of the components shown in FIG. 2; 8 is a diagram illustrating a state in which a peeling force from the inside is applied to the sealed portion of the container shown in FIG. 3; FIG. 5 is a diagram illustrating a state in which an unsealing force is applied to the container; FIG. and FIG. 9 are diagrams illustrating the form of a container applied to the present invention. Show score. Reference number 1 is the container body, 2 is the lid, 4 is the heat sealing flange, 5 is the lid inner material, 6 is the intermediate material body, sealing layer, 8 is the low temperature sealing layer, sealing part, 10 is the tight sealing part , starting position, 17 is the grip part for opening, 1 3 is the intermediate material, a is the lid base material, 7 is cohesive failure 9 is easy peelability 13 is for opening 8 is for opening Figure 1 + tH Gin Open tH : Heat Sea) Shiginpen 1'N Figure
Claims (2)
、樹脂内面材を有する蓋と、該フランジと蓋との間の少
なくとも開封開始部に挿入された樹脂中間材との積層ヒ
ートシール構造を有し、該フランジと中間材との間に易
剥離性シール及び蓋内面材と樹脂中間材との間にタイト
シールがそれぞれ形成され、該蓋内面材及び樹脂中間材
の少なくとも一方は、両者の界面側に、該蓋内面材の融
点及び樹脂中間材の融点の内低い方よりも更に低い融点
を有する低温シール性樹脂層を有することを特徴とする
易開封性密封容器。(1) It has a laminated heat-sealing structure consisting of a cup-shaped container having a heat-sealing flange, a lid having a resin inner surface material, and a resin intermediate material inserted at least at the opening start part between the flange and the lid. , an easily peelable seal is formed between the flange and the intermediate material, and a tight seal is formed between the lid inner material and the resin intermediate material, and at least one of the lid inner material and the resin intermediate material is on the interface side between the two. An easily openable sealed container characterized by having a low-temperature sealing resin layer having a melting point lower than the lower of the melting point of the inner lid material and the melting point of the resin intermediate material.
フランジ部に対して樹脂中間材をヒートシールして易剥
離性シールを形成させる工程と、この容器に内容物を充
填した後、樹脂内面材を有する蓋を施し、蓋内面材と中
間材とをヒートシールしてタイトシールを形成させる工
程とから成り、蓋内面材及び中間材の少なくとも一方と
して、両者の界面側に蓋内面材の融点及び樹脂中間材の
融点の内低い方よりも更に低い融点を有する低温シール
性樹脂層を有するものを使用し、蓋側からの熱伝導によ
り蓋内面材と中間材とのヒートシールを行うことを特徴
とする易開封性密封容器の製造方法。(2) A step of heat-sealing a resin intermediate material to the flange portion of a cup-shaped container having a heat-sealing flange to form an easily peelable seal, and after filling the container with the contents, attaching the resin inner material to the flange portion of the cup-shaped container. The process consists of forming a tight seal by heat-sealing the lid inner material and the intermediate material, and at least one of the lid inner material and the intermediate material has a melting point of the lid inner material and a resin on the interface side of the two. It is characterized by using a low-temperature sealing resin layer having a melting point lower than the lower of the melting points of the intermediate material, and heat-sealing the inner lid material and the intermediate material by heat conduction from the lid side. A method for producing an easy-to-open sealed container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25838388A JPH02109873A (en) | 1988-10-15 | 1988-10-15 | Easy opening sealing container and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25838388A JPH02109873A (en) | 1988-10-15 | 1988-10-15 | Easy opening sealing container and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02109873A true JPH02109873A (en) | 1990-04-23 |
| JPH0530707B2 JPH0530707B2 (en) | 1993-05-10 |
Family
ID=17319481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25838388A Granted JPH02109873A (en) | 1988-10-15 | 1988-10-15 | Easy opening sealing container and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02109873A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0448170U (en) * | 1990-08-27 | 1992-04-23 | ||
| JP2002284235A (en) * | 2001-03-28 | 2002-10-03 | Toppan Printing Co Ltd | Cup-formed container and manufacturing method thereof |
| JP2005271972A (en) * | 2004-03-25 | 2005-10-06 | Chuei Products Co Ltd | Easy-to-open multi-layer container |
| JP2007022589A (en) * | 2005-07-15 | 2007-02-01 | Idemitsu Unitech Co Ltd | Package |
-
1988
- 1988-10-15 JP JP25838388A patent/JPH02109873A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0448170U (en) * | 1990-08-27 | 1992-04-23 | ||
| JP2002284235A (en) * | 2001-03-28 | 2002-10-03 | Toppan Printing Co Ltd | Cup-formed container and manufacturing method thereof |
| JP4655396B2 (en) * | 2001-03-28 | 2011-03-23 | 凸版印刷株式会社 | Manufacturing method of cup-shaped container |
| JP2005271972A (en) * | 2004-03-25 | 2005-10-06 | Chuei Products Co Ltd | Easy-to-open multi-layer container |
| JP2007022589A (en) * | 2005-07-15 | 2007-02-01 | Idemitsu Unitech Co Ltd | Package |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0530707B2 (en) | 1993-05-10 |
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