JPH1134258A - Film for lid material and container using the same - Google Patents
Film for lid material and container using the sameInfo
- Publication number
- JPH1134258A JPH1134258A JP9189912A JP18991297A JPH1134258A JP H1134258 A JPH1134258 A JP H1134258A JP 9189912 A JP9189912 A JP 9189912A JP 18991297 A JP18991297 A JP 18991297A JP H1134258 A JPH1134258 A JP H1134258A
- Authority
- JP
- Japan
- Prior art keywords
- film
- biaxially stretched
- stretched polyamide
- hot water
- polyamide film
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 46
- 239000004952 Polyamide Substances 0.000 claims abstract description 51
- 229920002647 polyamide Polymers 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000000565 sealant Substances 0.000 claims description 22
- 238000004806 packaging method and process Methods 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 3
- 238000009835 boiling Methods 0.000 abstract description 3
- 238000010030 laminating Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- -1 polyhexamethylene sebacamide Polymers 0.000 description 5
- 230000037303 wrinkles Effects 0.000 description 5
- 229920002292 Nylon 6 Polymers 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 229920002302 Nylon 6,6 Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000009820 dry lamination Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 229920000305 Nylon 6,10 Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- GVNWZKBFMFUVNX-UHFFFAOYSA-N Adipamide Chemical compound NC(=O)CCCCC(N)=O GVNWZKBFMFUVNX-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 101000576320 Homo sapiens Max-binding protein MNT Proteins 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002396 Polyurea Polymers 0.000 description 1
- 229920006121 Polyxylylene adipamide Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 1
- OYQYHJRSHHYEIG-UHFFFAOYSA-N ethyl carbamate;urea Chemical compound NC(N)=O.CCOC(N)=O OYQYHJRSHHYEIG-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、タブにカールが起
きにくく、シーラントフィルムとの接着性に優れた蓋材
用フィルムとこれを使用した密封包装容器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for a lid material which is unlikely to curl on a tab and has excellent adhesion to a sealant film, and a sealed packaging container using the same.
【０００２】[0002]
【従来の技術】ゼリーや茶碗蒸し等の食品は、密封包装
容器内に充填されて流通経路に乗せられ、家庭内で保存
されるが、長期保存を可能とさせるために、容器に充填
された状態でボイルやレトルト等の加熱殺菌処理を施さ
れる。前記密封包装容器は、開口縁にフランジを有し内
部に被包装物が充填された容器本体と開封用タブを有し
前記フランジにヒートシールされた蓋材とを備えてい
る。前記蓋材としては一般にプラスチックフィルムが使
用されている。蓋材用フィルムは、包装用フィルムに一
般的に要求される物性を維持する基材フィルムとこの基
材フィルムを容器本体のフランジに接着させるためのシ
ーラントフィルムとを少なくとも備えている。シーラン
トフィルムには、蓋材をフランジに密着させることと蓋
材をフランジから容易に剥離できることとの二面性（イ
ージーピールタイプ）が要求されている。2. Description of the Related Art Foods such as jelly and chawanmushi are filled in a sealed packaging container, put on a distribution channel, and stored at home. However, in order to enable long-term storage, they are filled in containers. Is subjected to a heat sterilization treatment such as boiling and retorting. The hermetically sealed packaging container includes a container body having a flange at an opening edge and filled with an object to be packaged therein, and a lid member having an opening tab and heat-sealed to the flange. Generally, a plastic film is used as the lid material. The lidding film includes at least a base film for maintaining physical properties generally required for a packaging film, and a sealant film for bonding the base film to the flange of the container body. The sealant film is required to have a two-sided property (easy peel type) in which the lid material is brought into close contact with the flange and the lid material can be easily peeled off from the flange.
【０００３】前記基材フィルムには、流通経路での取扱
いや販売先、家庭等での保管などを考慮して、ガスバリ
ヤー性、機械的強度、耐熱性等、包装用フィルムに一般
的に要求される物性を備えているほか、前記加熱殺菌処
理を考慮して、熱収縮特性と接着性（基材フィルムとシ
ーラントフィルムの間の接着強度）に優れていることも
要求される。[0003] The above-mentioned base film is generally required to have gas barrier properties, mechanical strength, heat resistance, etc. in consideration of handling through distribution channels, storage at sales destinations, homes, and the like. In addition to the heat-sterilization treatment, the heat-shrinking property and the adhesiveness (the adhesive strength between the base film and the sealant film) are required to be excellent.
【０００４】基材フィルムとしては、従来、機械的強
度、耐熱性および価格面から、ＰＥＴやＰＥＴ／アルミ
ニウム箔からなる積層フィルムが最も一般的に用いれて
いたが、近年、密封包装容器が多方面で使用されるよう
になってきたことから、耐ピンホール性や外観（蓋面に
張りがありタブにカールが少ないこと等の見栄え）など
の要求が高まり、基材フィルムとして、二軸延伸ポリア
ミドフィルム（ＯＮ）が注目されるようになり、ＯＮ単
層フィルムやＯＮ／アルミニウム蒸着ＰＥＴからなる積
層フィルムなどが用いられている。二軸延伸ポリアミド
フィルムは、耐ピンホール性に優れているとともに、熱
水や水蒸気等のガラス転移点以上の高温雰囲気に曝され
ると、フィルム内部の応力が緩和されて熱収縮が起きる
ため、前記加熱殺菌工程ではこの熱収縮により蓋材に張
りが生じて見栄えが良くなり、商品価値が増すからであ
る。As a substrate film, a laminated film composed of PET or PET / aluminum foil has been most generally used in view of mechanical strength, heat resistance and price, but in recent years, sealed packaging containers have been used in various fields. Demand for pinhole resistance and appearance (the appearance of the lid surface being tight and the tabs having little curl) are increasing, and biaxially stretched polyamide is used as the base film. Attention has been paid to the film (ON), and an ON single-layer film and a laminated film made of ON / aluminum-deposited PET have been used. The biaxially stretched polyamide film has excellent pinhole resistance and, when exposed to a high-temperature atmosphere above the glass transition point such as hot water or steam, stress inside the film is relaxed and thermal shrinkage occurs, This is because, in the heat sterilization step, the heat shrinks the tension on the lid material, thereby improving the appearance and increasing the commercial value.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来、
二軸延伸ポリアミドフィルムとして収縮率の高いものを
使用すると、張りの面で高い効果が得られるものの、容
器が変形したりタブにカールが生じたりすると言う問題
があった。他方、収縮率の低いものを使用すると、張り
が生じなくなり、蓋材にタルミや皺が生じると言う問題
があった。すなわち、二軸延伸ポリアミドフィルムの収
縮率を単純に調節するだけでは、蓋材の張り性とタブカ
ール性を両立させることが困難であった。However, conventionally,
When a biaxially stretched polyamide film having a high shrinkage is used, a high effect is obtained in terms of tension, but there is a problem that the container is deformed or the tab is curled. On the other hand, if a material having a low shrinkage rate is used, there is a problem that tension does not occur and the cover material is liable to be thickened or wrinkled. That is, it is difficult to achieve both the tension and the tab curl of the lid material by simply adjusting the shrinkage of the biaxially stretched polyamide film.
【０００６】さらに、シーラントフィルムとの接着性に
も問題があって、タブを使って開封するときに、基材フ
ィルムとシーラントフィルムとの間で剥離（デラミネー
ション）が生じ、開封できないと言う問題もあった。二
軸延伸ポリアミドフィルムと無延伸ポリアミドフィルム
を積層することによりタブのカールや蓋面の皺を防ぐこ
とが実開平３−９７０６５号公報で提案されている。ま
た、二軸延伸ポリアミドフィルムの２層構成によりタブ
に上向きのカールを生じさせてタブによる開封を容易化
することが特開平４−６０６３号公報で提案されてい
る。しかしながら、これらの構成でも、蓋材の外観に関
する張り性とタブカール性の両立、および基材フィルム
とシーラントフィルムとの間での接着性の問題を十分に
解消することが出来なかった。[0006] Furthermore, there is also a problem in the adhesiveness to the sealant film, and when opening using a tab, peeling (delamination) occurs between the base film and the sealant film, making it impossible to open. There was also. It has been proposed in Japanese Utility Model Laid-Open Publication No. 3-97065 to prevent a tab from curling and a lid surface from being wrinkled by laminating a biaxially stretched polyamide film and a non-stretched polyamide film. Japanese Patent Application Laid-Open No. 4-6063 proposes that a tab is upwardly curled by a two-layer structure of a biaxially stretched polyamide film to facilitate opening with the tab. However, even with these configurations, it was not possible to sufficiently solve the problems of compatibility between the tensile strength and the tab curl property related to the appearance of the lid material and the adhesiveness between the base material film and the sealant film.
【０００７】本発明は、以上の事情に鑑みて、上記外観
と接着性上での問題を解消した蓋材用フィルムを提供す
るとともに、この蓋材用フィルムを使用した密封包装容
器を提供することを課題とする。[0007] In view of the above circumstances, the present invention provides a film for a lid material which has solved the above-mentioned problems in appearance and adhesiveness, and a sealed packaging container using the film for a lid material. As an issue.
【０００８】[0008]
【課題を解決するための手段】前記課題を解決するため
に、本発明にかかる蓋材用フィルムは、熱水収縮率が
１．０〜５．０％の二軸延伸ポリアミドフィルムを必須
とする基材フィルムの少なくとも片面に、易接着コート
処理として０．０１〜０．５ｇ／ｍ2 の塗布量のポリウ
レタン系樹脂層が形成されてなる。Means for Solving the Problems In order to solve the above-mentioned problems, a film for a lid material according to the present invention essentially comprises a biaxially stretched polyamide film having a hot water shrinkage of 1.0 to 5.0%. A polyurethane resin layer is formed on at least one side of the base film at a coating amount of 0.01 to 0.5 g / m 2 as an easy adhesion coating treatment.
【０００９】前記ポリウレタン系樹脂層は架橋されてい
ることが好ましい。本発明にかかる蓋材用フィルムは、
基材フィルムの易接着コート処理を施した面にシーラン
トフィルムを積層することが出来る。本発明にかかる蓋
材用フィルムは、基材フィルムが２層構成の積層フィル
ムからなるときは、基材フィルムとして、熱水収縮率が
１．０〜５．０％である第１の二軸延伸ポリアミドフィ
ルムと熱水収縮率が前記第１の二軸延伸ポリアミドフィ
ルムよりも低い第２の二軸延伸ポリアミドフィルムとの
積層フィルムを選び、この積層フィルムに対して、前記
第１の二軸延伸ポリアミドフィルムにおける前記第２の
二軸延伸ポリアミドフィルム貼着面とは反対側の面に前
記シーラントフィルムを積層するようにすることが好ま
しい。The polyurethane resin layer is preferably crosslinked. The film for a lid material according to the present invention,
A sealant film can be laminated on the surface of the base film which has been subjected to the easy adhesion coating treatment. When the base film is a laminated film having a two-layer structure, the first biaxial film having a hot water shrinkage of 1.0 to 5.0% is used as the base film. A laminated film of a stretched polyamide film and a second biaxially stretched polyamide film having a hot water shrinkage lower than that of the first biaxially stretched polyamide film is selected. It is preferable that the sealant film is laminated on the surface of the polyamide film opposite to the surface on which the second biaxially stretched polyamide film is adhered.
【００１０】前記本発明の蓋材用フィルムに使用されて
いる二軸延伸ポリアミドフィルムは、縦方向（ＭＤ）と
横方向（ＴＤ）の熱水収縮率比（ＭＤ／ＴＤおよびＴＤ
／ＭＤ）が２．５以下の範囲にあるものであることが好
ましい。前記課題を解決するために、本発明にかかる密
封包装容器は、開口縁にフランジを有し内部に被包装物
が充填された容器本体とタブを有し前記フランジにヒー
トシールされた蓋材とを備えた密封包装容器において、
前記蓋材が本発明にかかる前記蓋材用フィルムからなる
ことを特徴とする。The biaxially stretched polyamide film used in the lidding film of the present invention has a hot water shrinkage ratio (MD / TD and TD) in the machine direction (MD) and transverse direction (TD).
/ MD) is preferably in the range of 2.5 or less. In order to solve the above problem, a sealed packaging container according to the present invention has a lid at the opening edge and a container body and a tab filled with an object to be packaged therein, and a lid material heat-sealed to the flange. In a sealed packaging container provided with
The lid material is made of the lid material film according to the present invention.
【００１１】[0011]
【発明の実施の形態】本発明にかかる蓋材用フィルム
は、基材フィルムとして、同時か逐次の二軸延伸ポリア
ミドフィルムを使用している。ポリアミドとしては、例
えば、ポリカプロラクタム（ナイロン６）、ポリヘキサ
メチレンアジパミド（ナイロン６６）、ポリヘキサメチ
レンセバカミド（ナイロン６１０）、ポリアミノウンデ
カン酸（ナイロン１１）、ポリラウリンラクタム（ナイ
ロン１２）、ポリキシレンアジパミド（ＭＸＤ６）およ
びこれらの混合物などが挙げられるが、ナイロン６とナ
イロン６６が好ましく用いられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The lid film according to the present invention uses a simultaneous or successive biaxially stretched polyamide film as a base film. Examples of the polyamide include polycaprolactam (nylon 6), polyhexamethylene adipamide (nylon 66), polyhexamethylene sebacamide (nylon 610), polyaminoundecanoic acid (nylon 11), and polylaurin lactam (nylon 12). , Polyxylene adipamide (MXD6) and mixtures thereof, and nylon 6 and nylon 66 are preferably used.
【００１２】基材フィルムとして従来使用されているポ
リエステルフィルム（ＰＥＴ）が熱水収縮率１〜２％、
突刺ピンホール強力約６００ｇ／１２μm であり、延伸
ポリプロピレンフィルム（ＯＰＰ）が熱水収縮率１〜２
％、突刺ピンホール強力約８００ｇ／２０μm であるの
に対し、二軸延伸ポリアミドフィルムは例えば熱水収縮
率２〜３％、突刺ピンホール強力約１０００ｇ／１５μ
m といずれも高い。なお、本明細書において、熱水収縮
率は１００°Ｃ沸騰水、５分間での収縮率を言う。A polyester film (PET) conventionally used as a substrate film has a hot water shrinkage of 1-2%,
The piercing pinhole strength is about 600 g / 12 µm, and the stretched polypropylene film (OPP) has a hot water shrinkage of 1-2.
%, And the piercing pinhole strength is about 800 g / 20 μm, whereas the biaxially stretched polyamide film has, for example, a hot water shrinkage of 2-3% and a piercing pinhole strength of about 1000 g / 15 μm.
m and both are high. In this specification, hot water shrinkage refers to shrinkage in boiling water at 100 ° C. for 5 minutes.
【００１３】本発明では、このように、ピンホール強度
が高く、収縮率も高い二軸延伸ポリアミドフィルムが基
材フィルムを構成する必須のフィルムとして使用され
る。ただし、本発明で使用し得る二軸延伸ポリアミドフ
ィルムの熱水収縮率としては、前記範囲よりも広く、下
限は１．０％、上限は５．０ ％の範囲内にあれば良
い。好ましくは１．５〜３．０％の範囲内のものであ
る。二軸延伸ポリアミドフィルムは、フィルムの機械方
向（縦方向）ＭＤの熱水収縮率と幅方向ＴＤの熱水収縮
率の比（ＭＤ／ＴＤおよびＴＤ／ＭＤ）は２．５以下が
好ましく、０．５〜２．０であることがより好ましい。
熱収縮率比が２．５を越えると、熱水処理、例えばボイ
ル処理やレトルト処理のときには容器の変形が生じ易
く、開封時には基材フィルムがシーラントフィルムから
剥離し易くなって容易かつ円滑な開封が出来にくくなる
からである。なお、前記二軸延伸ポリアミドフィルムの
熱水収縮率１．０〜５．０％はＴＤ側の値であってもＭ
Ｄ側の値であっても良い。二軸延伸ポリアミドフィルム
は、収縮率が高いため、蓋材としての使用過程で、被包
装物を充填しこの蓋材でシールした密封包装容器に対し
加熱殺菌処理を施したとき、この過程およびその後に乾
燥状態に戻る過程で収縮して蓋材に張りを生じさせ、美
麗感、高級感を有する密封包装容器を得させる。In the present invention, a biaxially stretched polyamide film having a high pinhole strength and a high shrinkage is used as an essential film constituting a base film. However, the hot water shrinkage of the biaxially stretched polyamide film that can be used in the present invention may be wider than the above range, with the lower limit being 1.0% and the upper limit being within 5.0%. Preferably, it is in the range of 1.5 to 3.0%. In the biaxially stretched polyamide film, the ratio (MD / TD and TD / MD) of the hot water shrinkage in the machine direction (longitudinal direction) MD to the hot water shrinkage in the width direction TD of the film is preferably 2.5 or less. More preferably, it is from 0.5 to 2.0.
When the heat shrinkage ratio exceeds 2.5, deformation of the container is apt to occur during hot water treatment, for example, boil treatment or retort treatment, and the base film is easily peeled off from the sealant film at the time of opening. This is because it becomes difficult to perform. The hot water shrinkage of the biaxially stretched polyamide film is 1.0 to 5.0% even if the value is on the TD side.
The value on the D side may be used. Since the biaxially stretched polyamide film has a high shrinkage ratio, in the process of use as a lid material, when a heat-sterilization treatment is applied to a sealed packaging container filled with an object to be packaged and sealed with the lid material, this process and thereafter. In the process of returning to the dry state, the cover material shrinks to produce tension in the lid material, thereby obtaining a sealed packaging container having a beautiful and luxurious feeling.
【００１４】基材フィルム１としては、図１の(a) に見
るように、このような収縮率範囲を有する二軸延伸ポリ
アミドフィルム１ａの１層のみでもよいが、図１の(b)
に見るように、このような収縮率範囲を有する第１の二
軸延伸ポリアミドフィルム１ａに、このフィルムよりも
収縮率の低い第２の二軸延伸ポリアミドフィルム１ｂを
貼着した積層フィルムも使用される。基材フィルムが２
層構成になっている場合には、表基材フィルム（第２の
二軸延伸ポリアミドフィルム１ｂ）の熱水収縮率がシー
ラントフィルムとの間に介在する中間基材フィルム（第
１の二軸延伸ポリアミドフィルム１ａ）の熱水収縮率よ
り大きくなると、タブにカールが生じやすくなるが、積
層フィルムの各層の二軸延伸ポリアミドフィルムの収縮
率につき上のように配慮すると、タブにカールが生じに
くくなる。例えカールがあっても下向きのカールにな
り、外観上の美麗さが維持できる。積層フィルムの各層
の二軸延伸ポリアミドフィルムの収縮率につき上のよう
に配慮すると、基材フィルム１とシーラントフィルム３
との剥離を防ぎやすくもなる。基材フィルムの厚み（２
層等の多層構成の場合は合計厚み）は、特に限定する訳
ではないが、通常１０〜５０μｍの範囲内である。As shown in FIG. 1 (a), the base film 1 may be a single layer of the biaxially stretched polyamide film 1a having such a shrinkage ratio range.
As can be seen from the above, a laminated film in which a second biaxially stretched polyamide film 1b having a lower shrinkage rate than this film is adhered to a first biaxially stretched polyamide film 1a having such a shrinkage rate range is also used. You. Base film is 2
In the case of a layer structure, the hot water shrinkage ratio of the front base film (second biaxially stretched polyamide film 1b) is the intermediate base film (first biaxially stretched film) interposed between the front base film and the sealant film. If the hot water shrinkage ratio of the polyamide film 1a) is larger, curl is likely to occur on the tab. However, if the above-described consideration is given to the shrinkage ratio of the biaxially stretched polyamide film of each layer of the laminated film, curl is less likely to occur on the tab. . Even if there is a curl, the curl becomes downward and the beautiful appearance can be maintained. Considering the shrinkage ratio of the biaxially stretched polyamide film of each layer of the laminated film as described above, the base film 1 and the sealant film 3
It is easy to prevent peeling. Base film thickness (2
The total thickness in the case of a multilayer structure such as a layer) is not particularly limited, but is usually in the range of 10 to 50 μm.
【００１５】基材フィルムを構成する他の材料として
は、例えば、ＰＥＴ（ポリエチレンテレフタレ−ト）、
ＯＰＰ（延伸ポリプロピレン）、ＰＶＡ（ポリビニルア
ルコ−ル）、ＥＶＯＨ（エチレンビニルアルコ−ル）な
どの二軸あるいは一軸延伸フィルムがあり、必要に応
じ、二軸延伸ポリアミドフィルムと併用される。そし
て、この基材フィルム１の少なくとも片面に、易接着コ
ート処理として０．０１〜０．５ｇ／ｍ2 の塗布量でポ
リウレタン系樹脂層２が形成されている（図１では片面
にしか塗布されていない）。ポリウレタン系樹脂層の好
ましい塗布量は０．０３〜０．３ｇ／ｍ2 の範囲内であ
る。ポリウレタン系樹脂層が基材フィルム１の両面に形
成されている場合でも、この塗布量は片面のみの値であ
る。ここに、ポリウレタン系樹脂層２を構成するポリウ
レタン系樹脂としては通常のウレタン樹脂のほかウレタ
ン尿素樹脂なども使用できる。このポリウレタン系樹脂
層は架橋されたものであっても良い。架橋剤としては、
メラミン系架橋剤やエポキシ系架橋剤等が挙げられる。Other materials constituting the base film include, for example, PET (polyethylene terephthalate),
There are biaxially or uniaxially stretched films such as OPP (stretched polypropylene), PVA (polyvinyl alcohol), and EVOH (ethylene vinyl alcohol), and they are used in combination with a biaxially stretched polyamide film as required. The polyurethane resin layer 2 is formed on at least one surface of the base film 1 at an application amount of 0.01 to 0.5 g / m 2 as an easy adhesion coating treatment. Not). The preferable coating amount of the polyurethane resin layer is in the range of 0.03 to 0.3 g / m 2 . Even when the polyurethane-based resin layer is formed on both sides of the base film 1, this coating amount is a value on only one side. Here, as the polyurethane resin constituting the polyurethane resin layer 2, a urethane urea resin or the like can be used in addition to a normal urethane resin. The polyurethane resin layer may be crosslinked. As a crosslinking agent,
A melamine-based crosslinking agent and an epoxy-based crosslinking agent are exemplified.
【００１６】本発明にかかる蓋材用フィルムは、図２の
（ａ）にみるように、第１の二軸延伸ポリアミドフィル
ム１ａの片面にシーラントフィルム３がラミネート加工
により積層されたものである。シーラントフィルムの材
料としては、特に限定する訳ではないが、ＬＤＰＥ（低
密度ポリエチレン）、Ｌ−ＬＤＰＥ（直鎖状低密度ポリ
エチレン）、ＥＶＡ（エチレン−酢酸ビニル共重合
体）、ＣＰＰ（無延伸ポリプロピレン）、アイオノマー
等、およびこれらの混合物などを挙げることが出来る。
その厚みは、特に限定する訳ではないが、３０〜８０μ
m である。基材フィルム１が２層構成のときは、図２の
(b) に見るように、第１の二軸延伸ポリアミドフィルム
１ａの外面（第１の二軸延伸ポリアミドフィルム１ａに
おける第２の二軸延伸ポリアミドフィルム１ｂ貼着面と
は反対側の面）側に積層する。タブカール性を良くする
上で好ましいからである。As shown in FIG. 2A, the lidding film according to the present invention is obtained by laminating a sealant film 3 on one surface of a first biaxially stretched polyamide film 1a by lamination. Although the material of the sealant film is not particularly limited, LDPE (low density polyethylene), L-LDPE (linear low density polyethylene), EVA (ethylene-vinyl acetate copolymer), CPP (unstretched polypropylene) ), Ionomers and the like, and mixtures thereof.
Although the thickness is not particularly limited, it is 30 to 80 μm.
m. When the base film 1 has a two-layer structure,
As shown in (b), the outer surface of the first biaxially stretched polyamide film 1a (the surface of the first biaxially stretched polyamide film 1a opposite to the surface to which the second biaxially stretched polyamide film 1b is attached). To be laminated. This is because it is preferable for improving the tab curl property.
【００１７】蓋材用フィルムの多層ラミネ−ト方法とし
ては、例えばＤＬ（ドライラミネ−ト）、ＥＬ（押し出
しラミネ−ション）、ＨＬ（ホットメルトラミネ−ト）
などがある。本発明にかかる密封包装容器は、図３に見
るように、容器本体４と蓋材５を備えている。蓋材５は
図４に見るように開封用のタブ５１を有する。容器本体
４は、その内部に被包装物６が充填されており、開口縁
にフランジ４１を有する。蓋材５は前述の蓋材用フィル
ムからなる。As a method of multi-layer lamination of the film for the cover material, for example, DL (dry lamination), EL (extrusion lamination), HL (hot melt laminate)
and so on. The sealed packaging container according to the present invention includes a container body 4 and a lid member 5 as shown in FIG. The lid member 5 has a tab 51 for opening as shown in FIG. The container body 4 is filled with an article 6 to be packaged, and has a flange 41 on an opening edge. The lid member 5 is made of the above-mentioned lid material film.
【００１８】[0018]
【実施例】以下に、本発明の実施例を比較例と併せて示
すが、本発明は下記実施例に限定されない。 −実施例１− ９６％濃硫酸中、２５℃で測定した相対粘度３．０のポ
リカプロラクタム（ユニチカ社製Ａ１０３０ＢＲＦ）を
２７０℃のＴダイから溶融押し出しし、３０℃の冷却ド
ラム上で冷却し、厚みが１６０μｍの未延伸フィルムを
得た。次に、自己乳化性ポリウレタンポリ尿素樹脂１０
０重量部に対しメラミン系架橋剤を６重量部添加してな
るコート溶液を、前記の未延伸フィルムの片面にエアー
ナイフ法でコーティングし、そののち乾燥し、延伸温度
１８０℃、縦方向（ＭＤ）延伸倍率３．３、横方向（Ｔ
Ｄ）延伸倍率３．０で二軸延伸を行った。得られた蓋材
用フィルムの基材フィルム、すなわち二軸延伸ポリアミ
ドフィルム（ＯＮ１）は、縦方向（ＭＤ）熱水収縮率
２．５％、横方向（ＴＤ）熱水収縮率１．５％、厚み１
５μｍであり、片面に易接着コート処理として厚み０．
１ｇ／ｍ2 のポリウレタン系樹脂層を有する。EXAMPLES Examples of the present invention will be described below together with comparative examples, but the present invention is not limited to the following examples. Example 1 Polycaprolactam (A1030BRF manufactured by Unitika) having a relative viscosity of 3.0 measured at 25 ° C. in 96% concentrated sulfuric acid was melt-extruded from a T-die at 270 ° C. and cooled on a cooling drum at 30 ° C. An unstretched film having a thickness of 160 μm was obtained. Next, a self-emulsifying polyurethane polyurea resin 10
A coating solution obtained by adding 6 parts by weight of a melamine-based crosslinking agent to 0 parts by weight is coated on one surface of the unstretched film by an air knife method, and then dried, and then stretched at a temperature of 180 ° C and a longitudinal direction (MD). ) Stretch ratio 3.3, transverse direction (T
D) Biaxial stretching was performed at a stretching ratio of 3.0. The base film of the obtained lid material film, that is, the biaxially stretched polyamide film (ON1) has a hot water shrinkage of 2.5% in the machine direction (MD) and a hot water shrinkage of 1.5% in the transverse direction (TD). , Thickness 1
5 μm, with a thickness of 0.
It has a polyurethane resin layer of 1 g / m 2 .
【００１９】−実施例２〜７、比較例１〜４− 実施例１で使用した厚み１６０μｍの未延伸フィルムを
使用し、延伸温度と延伸倍率を調整するとともに、延伸
後のポリウレタン系樹脂層の厚みが０．０１〜０．７ｇ
／ｍ2 の範囲内となるように前記コート溶液の濃度調整
をして、熱水収縮率が下記表１記載のように異なる二軸
延伸ポリアミドフィルム（ＯＮ２〜ＯＮ７、ＯＮ９〜Ｏ
Ｎ１１）の片面に厚みが下記表１記載のように異なるポ
リウレタン系樹脂層を有する、実施例２〜７、比較例２
〜４の蓋材用フィルムを得た。実施例１で使用した厚み
１６０μｍの未延伸フィルムを使用し、延伸温度と延伸
倍率は調整するが、コート処理はしないで、表１記載の
比較例１の蓋材用フィルム（二軸延伸ポリアミドフィル
ムＯＮ８）を得た。Examples 2 to 7, Comparative Examples 1 to 4 Using the unstretched film having a thickness of 160 μm used in Example 1, the stretching temperature and the stretching ratio were adjusted, and the stretched polyurethane resin layer was 0.01-0.7g in thickness
/ A and the density adjustment coat solution m to be within a range of 2, different biaxially stretched polyamide film as the hot water shrinkage following Table 1, wherein (ON2~ON7, ON9~O
N2) Examples 2 to 7 and Comparative Example 2 each having a polyurethane resin layer having a different thickness on one surface as shown in Table 1 below.
To 4 were obtained. The unstretched film having a thickness of 160 μm used in Example 1 was used, and the stretching temperature and the stretching ratio were adjusted, but the coating treatment was not performed, but the film for the lid material of Comparative Example 1 shown in Table 1 (biaxially stretched polyamide film) ON8) was obtained.
【００２０】[0020]
【表１】 [Table 1]
【００２１】−実施例８〜１９、比較例５〜８− 上記実施例および比較例の蓋材用フィルムを使用して表
２記載のシーラント付き蓋材用フィルムを構成し、厚み
６００μm のＰＰ（ポリプロピレン樹脂）押出成形シ−
トから作られたフランジ付きカップ状容器本体に水を充
填しておいて、これらのシーラント付き蓋材用フィルム
を前記カップ状容器本体のフランジにヒ−トシ−ルし、
蓋材としての性能を評価した。シ−ラントフィルムは、
イ−ジ−ピ−ルタイプフィルム（東セロ社製、ＣＭＰ
Ｓ、５０μm)を使用し、ラミネ−ト方法はドライラミネ
−トで実施した。結果を下記の表２に示す。Examples 8 to 19 and Comparative Examples 5 to 8 Using the lid material films of the above Examples and Comparative Examples, a film for a lid material with a sealant shown in Table 2 was constructed. Polypropylene resin) Extrusion molding
The container is filled with water, and the film for the cover material with the sealant is heat-sealed on the flange of the container body.
The performance as a lid material was evaluated. The sealant film is
Easy-Peel type film (CMP manufactured by Tocelo Co., Ltd.)
S, 50 μm), and the lamination method was dry lamination. The results are shown in Table 2 below.
【００２２】[0022]
【表２】 [Table 2]
【００２３】性能評価は、得られた密封包装容器を１０
０°Ｃの温度条件で３０分間熱水処理を処理した後、２
０°Ｃ、６５％ＲＨで２４時間放置し、十分に冷却乾燥
させたあと、下記の測定および評価法で、耐ピンホール
性（突刺強力）、変形と張り、タブカールおよび接着性
を測定し、総合評価も行った。 （１）耐ピンホ−ル性 突刺ピンホ−ル強度で耐ピンホ−ル性を評価する。すな
わち、２０°Ｃ、６５％ＲＨの条件下で調整したサンプ
ルを６０mmの大きさのアルミニウム板に装着して、先端
半径０．５mmの鋼製ピンを速度５０mm／min で突き刺
し、強度を測定する。For the performance evaluation, the obtained sealed packaging container was evaluated for 10
After a hot water treatment for 30 minutes at a temperature of 0 ° C., 2
After leaving at 0 ° C. and 65% RH for 24 hours and sufficiently cooling and drying, the pinhole resistance (piercing strength), deformation and tension, tab curl and adhesion were measured by the following measurement and evaluation methods. A comprehensive evaluation was also performed. (1) Pinhole resistance The pinhole resistance is evaluated by the piercing pinhole strength. That is, a sample adjusted under the conditions of 20 ° C. and 65% RH was mounted on an aluminum plate having a size of 60 mm, and a steel pin having a tip radius of 0.5 mm was pierced at a speed of 50 mm / min to measure the strength. .
【００２４】（２）変形と張り 弾力や皺の有無から容器本体お変形と蓋材の張りを肉眼
で判定する。評価は下記の４段階とする。 ◎ 優 ：変形および皺が全くない。 ○ 良 ：変形および皺がほとんどない。(2) Deformation and tension The deformation of the container body and the tension of the lid material are visually judged from the elasticity and the presence or absence of wrinkles. The evaluation is based on the following four levels. Excellent: No deformation and no wrinkles. Good: Almost no deformation and wrinkles.
【００２５】△ 可 ：変形および皺がわずか見られ
る。 × 不可：変形または皺が多い。 （３）カ−ル性 開封用タブのカ−ルの度合いと方向を肉眼で判定する。
評価は下記の４段階とする。可 Acceptable: Deformation and wrinkles are slightly observed. × Not possible: Many deformations or wrinkles. (3) Curling The degree and direction of curling of the opening tab are visually determined.
The evaluation is based on the following four levels.
【００２６】◎ 優 ：カールが全くない。 ○ 良 ：僅か下側にカ−ルしているように見える。 △ 可 ：下側にカ−ルするか、僅かに上側にカ−ルし
ている。 × 不可：上側に大きくカ−ルし、場合により、渦巻き
状になっている。A: Excellent: no curl.良 Good: It looks as if it is slightly curled downward. △ Possible: Curled downward or slightly upward. × Not possible: Curled largely upwards and, in some cases, spiraled.
【００２７】（４）接着性 二軸延伸ポリアミドフィルムとシ−ラントフィルムとの
剥離強力（水付けＴ型法、ｇ／１５mm）を測定する。
（５）総合評価 耐ピンホール性、変形と張り、カールおよび接着性の測
定結果を総合して、下記の４段階で評価した。(4) Adhesiveness The peel strength between a biaxially stretched polyamide film and a sealant film (wet T-type method, g / 15 mm) is measured.
(5) Comprehensive Evaluation The measurement results of pinhole resistance, deformation and tension, curl and adhesiveness were comprehensively evaluated according to the following four grades.
【００２８】◎ 優 ○ 良 △ 可 × 不可 表２から明らかなように、実施例はいずれも、耐ピンホ
−ル性が高く、変形およびカ−ルが少なく、張りおよび
接着性が良好であった。これに対して、比較例は、耐ピ
ンホ−ル性は満足すつが、変形、張り、カ−ルまたは接
着性のいずれかで満足出来なかった。◎ Excellent ○ Good △ Good × Not Good As is clear from Table 2, all Examples had high pinhole resistance, little deformation and curl, and good tension and adhesion. . On the other hand, the comparative example was satisfactory in pinhole resistance, but was not satisfactory in any of deformation, tension, curl and adhesiveness.
【００２９】[0029]
【発明の効果】本発明にかかる蓋材用フィルムは、二軸
延伸ポリアミドフィルムの強靱性、透明性を生かし、蓋
材として特に強く要求される耐ピンホ−ル性を満足させ
るとともに、ボイル、レトルトなどの後熱処理での張り
やカ−ル、さらに接着性においても優れた特性を発揮す
る。The film for a cover material according to the present invention, which utilizes the toughness and transparency of a biaxially stretched polyamide film, satisfies the pinhole resistance particularly strongly required as a cover material, and also provides a boil, retort. It also exhibits excellent properties in tension and curl in post-heat treatment and also in adhesiveness.
【００３０】本発明にかかる密封包装容器は、このよう
な蓋材用フィルムを使用しているので、保存性に優れ、
しかも、優れた外観、良好な開封性を有する。The sealed packaging container according to the present invention is excellent in preservability since it uses such a film for a cover material.
Moreover, it has an excellent appearance and good openability.
【００３１】[0031]
【００３２】[0032]
【図１】本発明にかかる蓋材用フィルムの一部断面を示
す部分的断面図。FIG. 1 is a partial cross-sectional view showing a partial cross section of a film for a cover material according to the present invention.
【００３３】[0033]
【図２】本発明にかかる蓋材用フィルムの別の形態であ
って基材フィルムにシーラントフィルムを積層した形態
の一部断面を示す部分的断面図。FIG. 2 is a partial cross-sectional view showing a partial cross section of another embodiment of the lidding film according to the present invention, in which a sealant film is laminated on a base film.
【００３４】[0034]
【図３】本発明にかかる密封包装容器の断面を示す部分
的断面図。FIG. 3 is a partial cross-sectional view showing a cross section of the sealed packaging container according to the present invention.
【００３５】[0035]
【図４】本発明にかかる蓋材用フィルムを使用して作製
された蓋材を示す斜視図。FIG. 4 is a perspective view showing a lid member produced using the lid film according to the present invention.
【００３６】[0036]
１ 基材フィルム １ａ 第１の二軸延伸ポリアミドフィルム １ｂ 第２の二軸延伸ポリアミドフィルム ２ ポリウレタン系樹脂層 ３ シ−ラントフィルム ４ 容器本体 ４１ フランジ ５ 蓋材 ５１ タブ DESCRIPTION OF SYMBOLS 1 Base film 1a 1st biaxially stretched polyamide film 1b 2nd biaxially stretched polyamide film 2 Polyurethane resin layer 3 Sealant film 4 Container main body 41 Flange 5 Lid material 51 Tab
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｂ２９Ｋ 77:00 Continued on the front page (51) Int.Cl. 6 Identification code FI // B29K 77:00
Claims (6)
ポリアミドフィルムを必須とする基材フィルムの少なく
とも片面に、易接着コート処理として０．０１〜０．５
ｇ／ｍ2 の塗布量でポリウレタン系樹脂層が形成されて
いる蓋材用フィルム。An at least one side of a base film essentially comprising a biaxially stretched polyamide film having a hot water shrinkage of 1.0 to 5.0% is coated with 0.01 to 0.5 as an easy adhesion coating treatment.
A film for a lid material on which a polyurethane resin layer is formed at an application amount of g / m 2 .
る、請求項１に記載の蓋材用フィルム。2. The film for a cover material according to claim 1, wherein the polyurethane resin layer is crosslinked.
された面にシーラントフィルムが積層されている、請求
項１または２に記載の蓋材用フィルム。3. The film for a cover material according to claim 1, wherein a sealant film is laminated on the surface of the substrate film on which the easy adhesion coating treatment has been performed.
５．０％である第１の二軸延伸ポリアミドフィルムと熱
水収縮率が前記第１の二軸延伸ポリアミドフィルムより
も低い第２の二軸延伸ポリアミドフィルムとの積層フィ
ルムからなり、前記第１の二軸延伸ポリアミドフィルム
の側に前記シーラントフィルムが積層されている、請求
項３に記載の蓋材用フィルム。4. A base film having a hot water shrinkage of 1.0 to 1.0.
The first biaxially stretched polyamide film having a thermal water shrinkage of 5.0% and a second biaxially stretched polyamide film having a lower hot water shrinkage ratio than the first biaxially stretched polyamide film; The film for a cover material according to claim 3, wherein the sealant film is laminated on the side of the biaxially stretched polyamide film of (1).
Ｄ）と横方向（ＴＤ）の熱水収縮率比（ＭＤ／ＴＤおよ
びＴＤ／ＭＤ）が２．５以下の範囲にあるものである、
請求項１から４までのいずれかに記載の蓋材用フィル
ム。5. The longitudinal direction (M) of a biaxially stretched polyamide film.
D) and the ratio of hot water shrinkage ratio (MD / TD and TD / MD) in the transverse direction (TD) is in the range of 2.5 or less,
The film for a lid material according to claim 1.
充填された容器本体とタブを有し前記フランジにヒート
シールされた蓋材とを備えた密封包装容器において、前
記蓋材が請求項１から５までのいずれかに記載の蓋材用
フィルムからなることを特徴とする密封包装容器。6. A hermetically sealed packaging container comprising: a container body having a flange at an opening edge and filled with an object to be packaged therein; and a lid having a tab and being heat-sealed to said flange. A sealed packaging container comprising the lidding film according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9189912A JPH1134258A (en) | 1997-07-15 | 1997-07-15 | Film for lid material and container using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9189912A JPH1134258A (en) | 1997-07-15 | 1997-07-15 | Film for lid material and container using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1134258A true JPH1134258A (en) | 1999-02-09 |
Family
ID=16249297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9189912A Pending JPH1134258A (en) | 1997-07-15 | 1997-07-15 | Film for lid material and container using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1134258A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001246711A (en) * | 1999-12-27 | 2001-09-11 | Toppan Printing Co Ltd | Laminated body having pinhole resistance and packaging bag using the same |
| JP2002355889A (en) * | 2001-05-31 | 2002-12-10 | Unitika Ltd | Heat-shrinkable polyamide film and its packaging bag |
| KR20160137510A (en) | 2014-03-26 | 2016-11-30 | 유니띠까 가부시키가이샤 | Biaxially stretched polyamide film and method for producing same |
| WO2025146769A1 (en) * | 2024-01-04 | 2025-07-10 | 東洋紡株式会社 | Laminate and packaging bag |
-
1997
- 1997-07-15 JP JP9189912A patent/JPH1134258A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001246711A (en) * | 1999-12-27 | 2001-09-11 | Toppan Printing Co Ltd | Laminated body having pinhole resistance and packaging bag using the same |
| JP2002355889A (en) * | 2001-05-31 | 2002-12-10 | Unitika Ltd | Heat-shrinkable polyamide film and its packaging bag |
| KR20160137510A (en) | 2014-03-26 | 2016-11-30 | 유니띠까 가부시키가이샤 | Biaxially stretched polyamide film and method for producing same |
| JPWO2015147121A1 (en) * | 2014-03-26 | 2017-04-13 | ユニチカ株式会社 | Biaxially stretched polyamide film and method for producing the same |
| WO2025146769A1 (en) * | 2024-01-04 | 2025-07-10 | 東洋紡株式会社 | Laminate and packaging bag |
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