JP4570049B2 - Defect detection method for transparent gas barrier film - Google Patents
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本発明は、透明ガスバリアフィルム、特に透明プラスチックフィルムに透明無機酸化物蒸着層を積層した透明ガスバリアフィルムの欠陥検出方法に関する。 The present invention relates to a defect detection method for a transparent gas barrier film, particularly a transparent gas barrier film obtained by laminating a transparent inorganic oxide vapor deposition layer on a transparent plastic film.
通常、飲食店などに限らず精密工業部品など、酸素や水分を嫌う製品を包装する包装容器に、数々のガスバリア性材料が適用されている。特に金属酸化物蒸着層を有するガスバリア性材料は、高度なガスバリア性能を有するのみならず、高湿度雰囲気でもバリア性能の低下が少ない、電子レンジの使用が可能であり、透明であるため中身の確認が出来る等の特性を有している。しかし、金属酸化物蒸着層を有する基材の場合、金属酸化物蒸着層が硬くて脆いといった特性があり、包装材料として加工を行う際に、許容限度以上の引張りやこすれ、しわの発生などにより容易にクラックやピンホール等の欠陥が生じ、金属酸化物蒸着膜を有する基材が本来持っていた高度なバリア性能が著しく低下せしめられる。品質管理上、前記欠陥を持った不良品を捕らえ流出を防ぐ必要がある。又、前記欠陥を持った不良品がどのようなストレスにより発生したかを調査し、原因を取り除いて再発防止しなければならない。
ハイバリアフィルムの欠陥検出方法として、ハイバリアフィルムを介して隔てられたその両側の二つの密閉空間を真空排気し、前記密閉空間の一方側に異なる分子半径を有する少なくとも二種類のガスを所定圧力下所定温度で別々に導入し、前記ハイバリアフィルムを通過して他方側の密閉空間に導入された各ガスの透過量に応じた単位時間当りの圧力上昇値を検出し、前記圧力上昇値から各ガスの透過係数を算出すると共にこれらの透過係数比を求め、透過係数比の大きさからハイバリアフィルムの欠陥を判定する方法が知られている(特許文献1参照)。
又、セラミック等の絶縁被覆層のピンホール等の検査方法として、高浸透度を有する導電性液体を吸収させた軟質パッド及び金属基板に、超絶縁計を接続し、前記軟質パッドを金属基板の表面を絶縁被覆層で被覆した被検査体である絶縁被覆層の表面に当接させて絶縁度を測定し、絶縁度が所定以下であるとき、絶縁被覆の不良を判定する方法が知られている(特許文献2参照)。
又、密閉容器の酸素透過度検出方法として、被試験容器内に寒天等の固化作用物質を溶かしたロイコメチレンブルーの溶液を充填密封して前記溶液を固化させ、これを酸素含有雰囲気柱中に所定時間放置し、容器内への酸素透過に応じた、酸素の透過部位の寒天溶液の発色を観察する方法が知られている(特許文献3参照)。
As a defect detection method for a high barrier film, two sealed spaces on both sides separated by the high barrier film are evacuated, and at least two kinds of gases having different molecular radii on one side of the sealed space are predetermined under a predetermined pressure. Separately introduced at a temperature, a pressure increase value per unit time is detected according to the permeation amount of each gas that has passed through the high barrier film and introduced into the sealed space on the other side. A method is known in which a transmission coefficient is calculated and a ratio of these transmission coefficients is determined, and a defect in a high barrier film is determined from the magnitude of the transmission coefficient ratio (see Patent Document 1).
In addition, as a method for inspecting pinholes or the like of insulating coating layers such as ceramics, a superinsulator is connected to a soft pad and a metal substrate that have absorbed a conductive liquid having high permeability, and the soft pad is connected to the metal substrate. A method is known in which the insulation is measured by bringing the surface into contact with the surface of the insulation coating layer, which is an object to be inspected whose surface is covered with the insulation coating layer, and when the insulation is less than or equal to a predetermined value, the defect of the insulation coating is judged. (See Patent Document 2).
As a method for detecting the oxygen permeability of a sealed container, a leuco methylene blue solution in which a solidifying agent such as agar is dissolved is filled and sealed in a container to be tested, and the solution is solidified. A method of observing the color development of an agar solution at an oxygen permeation site corresponding to oxygen permeation into a container is known (see Patent Document 3).
特許文献1に記載の方法は、精度良く、詳細なデータが得られるという利点を有するが、特殊な装置が必要であり、又、クラックやピンホール等の欠陥の場所やその形状を特定することができない。又、特許文献2に記載の方法は、簡便且つ高速に欠陥の判定を行うことが可能な利点を有するが、この方法も特殊な装置を必要とし、又、導電性液体が通過するサイズ以下の欠陥は検出できない。更に、特許文献3に記載の方法は、欠陥箇所の特定と形状を視覚的に確認することができるという利点を有するが、被試験容器内に寒天等の固化作用物質を溶かしたロイコメチレンブルーの溶液を充填密封する必要があり、金属酸化物蒸着フィルム等の色素を充填可能な形態の容器を作製することが困難なもの、更に、色素の充填作業によってバリア性が低下するような材料からなる容器には使用できない。作業性に関しても、色素を含む、寒天等からなるゲル溶液の調整と容器内への前記ゲル溶液の充填が必要であり、且つ調整液は随時失活するため、予め大量に容易しておくことができず、評価を行う度毎に色素を含む、寒天等からなるゲル溶液を作製しなければならず、この方法は簡便、迅速に行うことができる方法とはいえない。
本発明が解決しようとする課題は、透明プラスチック基材に透明無機酸化物蒸着層を積層した透明ガスバリアフィルムの欠陥箇所を、正確に、簡便且つ迅速に確認し、評価することができる欠陥検出方法を提供することである。
The method described in Patent Document 1 has the advantage that detailed data can be obtained with high accuracy, but requires a special device, and specifies the location and shape of defects such as cracks and pinholes. I can't. In addition, the method described in Patent Document 2 has an advantage that a defect can be easily determined at high speed. However, this method also requires a special device, and is smaller than the size through which the conductive liquid passes. Defects cannot be detected. Furthermore, the method described in Patent Document 3 has an advantage that the defect location and shape can be visually confirmed, but a solution of leucomethylene blue in which a solidifying agent such as agar is dissolved in a container to be tested. It is difficult to produce a container that can be filled with a pigment, such as a metal oxide vapor deposited film, and a container made of a material whose barrier properties are reduced by the pigment filling operation. Can not be used. Regarding workability, it is necessary to prepare a gel solution composed of agar containing pigment, and to fill the container with the gel solution, and the adjustment solution is deactivated at any time. Each time evaluation is performed, a gel solution made of agar or the like containing a pigment must be prepared every time the evaluation is performed, and this method cannot be said to be a method that can be performed simply and rapidly.
The problem to be solved by the present invention is a defect detection method capable of accurately, simply and quickly confirming and evaluating a defect portion of a transparent gas barrier film in which a transparent inorganic oxide vapor deposition layer is laminated on a transparent plastic substrate. Is to provide.
請求項1に記載の発明は、上記の課題を解決するもので、金属酸化物蒸着層を有する透明ガスバリアフィルムの欠陥検出方法であって、この金属酸化物蒸着層を有する透明ガスバリアフィルムを分子鎖中に不飽和結合を有する材料からなる粘着剤を塗布した透明保護フィルムと貼り合わせて試験試料を形成し、この試験試料を沃素ガス中に放置し、前記金属酸化物蒸着層を有する透明ガスバリアフィルムに欠陥個所が存在するとき、この欠陥個所を通して沃素が粘着剤に接触して生じる沃素による発色の濃度差を観察することで、前記欠陥個所の特定を行うことを特徴とする透明ガスバリアフィルムの欠陥検出方法を要旨とする。 The invention according to claim 1 solves the above-described problem, and is a method for detecting a defect in a transparent gas barrier film having a metal oxide vapor deposition layer, wherein the transparent gas barrier film having the metal oxide vapor deposition layer is converted into a molecular chain. A test sample is formed by laminating with a transparent protective film coated with an adhesive made of a material having an unsaturated bond, and the test sample is left in iodine gas, and the transparent gas barrier film having the metal oxide deposition layer The defect of the transparent gas barrier film is characterized in that the defect is identified by observing a difference in density of coloration caused by iodine generated by contacting iodine with the adhesive through the defect. The gist of the detection method.
金属酸化物蒸着層を有する透明ガスバリアフィルムを分子鎖中に不飽和結合を有する材料からなる粘着剤を塗布した透明保護フィルムと貼り合わせて試験試料を形成し、この試験試料を沃素ガス中に放置し、前記透明ガスバリアフィルムに欠陥個所が存在するとき、この欠陥個所を通して沃素が沃素抵触材料である粘着剤に接触して生じる沃素による発色の濃度変化を観察することで、特殊な装置を用いることなく、正確に、簡便且つ迅速に確認し、評価することができる。 A transparent gas barrier film having a metal oxide vapor deposition layer is bonded to a transparent protective film coated with an adhesive made of a material having an unsaturated bond in the molecular chain to form a test sample, and the test sample is left in iodine gas. When the transparent gas barrier film has a defect portion, a special apparatus is used by observing a change in color density due to iodine generated by contacting iodine with an adhesive which is an iodine contact material through the defect portion. It is possible to confirm and evaluate accurately, simply and quickly.
本発明において、透明保護フィルムとして、そのガス透過度が金属酸化物蒸着層を有する透明ガスバリアフィルムの基材フィルムのガス透過度より低いものを用いるのが望ましい。 In the present invention, it is desirable to use a transparent protective film having a gas permeability lower than that of the base film of the transparent gas barrier film having a metal oxide vapor deposition layer.
本発明において、密封可能なガラス容器内に前記試験試料を沃素と共に封入し、封入したものを加温し、加温後、室温まで冷却することでより速く欠陥箇所の判別を行うことができる。又、沃素ガスは吸い込むと猛毒、目、皮膚を強く刺激するものであるがガラス容器内に封入することにより、安全に作業を行うことができる。 In the present invention, the test sample is sealed together with iodine in a sealable glass container, the sealed sample is heated, and after being heated, it is possible to determine the defective portion more quickly by cooling to room temperature. Iodine gas, when inhaled, strongly stimulates poison, eyes and skin, but can be safely operated by enclosing it in a glass container.
本発明において、粘着剤として、酢酸ビニル系粘着剤、エチレン酢酸ビニル系粘着剤、アクリル系粘着剤、スチレンアクリル系粘着剤、ウレタン系粘着剤、エポキシ系粘着剤、ポリエステル系粘着剤、シアノアクリレート系粘着剤の少なくとも一種を用いることができる。 In the present invention, as the adhesive, vinyl acetate adhesive, ethylene vinyl acetate adhesive, acrylic adhesive, styrene acrylic adhesive, urethane adhesive, epoxy adhesive, polyester adhesive, cyanoacrylate adhesive At least one kind of pressure-sensitive adhesive can be used.
金属酸化物蒸着層を有する透明ガスバリアフィルムを分子鎖中に不飽和結合を有する材料からなる粘着剤を塗布した透明保護フィルムと貼り合わせて試験試料を形成し、この試験試料を沃素ガス中に放置し、前記透明ガスバリアフィルムに欠陥個所が存在するとき、この欠陥個所を通して沃素が沃素抵触材料である粘着剤に接触して生じる沃素による発色の濃度変化を観察することで、特殊な装置を用いることなく、正確に、簡便且つ迅速に確認し、評価することができる。 A transparent gas barrier film having a metal oxide vapor deposition layer is bonded to a transparent protective film coated with an adhesive made of a material having an unsaturated bond in the molecular chain to form a test sample, and the test sample is left in iodine gas. When the transparent gas barrier film has a defect portion, a special apparatus is used by observing a change in color density due to iodine generated by contacting iodine with an adhesive which is an iodine contact material through the defect portion. It is possible to confirm and evaluate accurately, simply and quickly.
金属酸化物蒸着層を有する透明ガスバリアフィルムの巻き取りから無作為に1個乃至複数個の試料片を採取し、この試料片を分子鎖中に不飽和結合を有する材料からなる粘着剤を塗布した透明保護フィルムと貼り合わせて試験試料を形成する。次いでこの試験試料を、たとえばスクリューキャップガラス瓶のような密栓可能なガラス容器内に沃素と共に封入し、40℃オーブンで10分間ほど加温して沃素を昇華させる。尚、この加温はガラス瓶を湯の中に付けて行ってもよい。オーブンによる加温後、ガラス瓶をオーブンの外に出し室温まで冷却後ガラス瓶を通して粘着剤の発色の有無を目視により調べる。或いは沃素ガスを吸わないように注意して、又、目、皮膚への刺激を防止して試験試料をガラス瓶から取り出し調べてもよい。金属酸化物蒸着層を有する透明ガスバリアフィルムに欠陥個所が存在するとき、この欠陥個所を通して沃素が粘着剤に接触して沃素による発色がおこり、それを観察することによって欠陥個所の特定を行うことができる。
そして、欠陥箇所が発見された部分或いはロットは除くことにより、バリア不良品の流出を防ぐことができる。又、呈色の傾向からどのようなストレスからバリア不良が発生したかを調査し発生原因を取り除くことができる。
或いは
One or more sample pieces were randomly collected from the winding of the transparent gas barrier film having the metal oxide vapor-deposited layer, and this sample piece was coated with an adhesive made of a material having an unsaturated bond in the molecular chain. A test sample is formed by laminating with a transparent protective film. Next, this test sample is sealed together with iodine in a glass container that can be sealed, such as a screw cap glass bottle, and heated in a 40 ° C. oven for about 10 minutes to sublimate iodine. In addition, you may perform this heating by attaching a glass bottle in hot water. After heating in the oven, the glass bottle is taken out of the oven, cooled to room temperature, and then visually checked for color development of the adhesive through the glass bottle. Alternatively, care should be taken not to inhale iodine gas, or the eye or skin may be prevented from irritation and the test sample may be taken out of the glass bottle and examined. When there are defects in the transparent gas barrier film having a metal oxide vapor-deposited layer, iodine comes into contact with the pressure-sensitive adhesive through this defect and color is developed by iodine, and the defect can be identified by observing it. it can.
Then, by removing the part or lot where the defective part is found, it is possible to prevent the outflow of defective barrier products. In addition, it is possible to investigate from what stress the barrier failure has occurred from the tendency of coloration and to eliminate the cause of the occurrence.
Or
次に本発明において、沃素による発色を選択した理由について説明する。沃素を使用する有機化合物の分析手法の一つに、薄層クロマトグラフィー(TLC)が挙げられる。TLCにおいて、分離された極めて微量の有機化合物を目視確認するために様々な発色剤が使用されている。この中でも沃素は最も良く知られたものの一つである。沃素発色剤の特徴として赤茶から黄色に呈色し、広範囲の有機化合物に適用できる。又、沃素は昇華性があり、気体となって拡散するため、プラスチックフィルムの分子レベルの隙間や、ピンホールやクラックが存在する金属酸化物蒸着層に浸入することが可能である。よって前記したような欠陥箇所を有する金属酸化物蒸着層を有する透明ガスバリアフィルムの一方の面側に沃素が発色する沃素呈色材料を設けておき、もう一方の面側から金属酸化物蒸着層を有する透明ガスバリアフィルムの欠陥箇所を通して沃素呈色材料に接触させることにより、欠陥箇所を通して沃素が到達した部分において、沃素呈色材料は、赤茶色から黄色に呈色し、欠陥箇所が目視可能となる。これにより、金属酸化物蒸着層を有する透明ガスバリアフィルムのどの位置に欠陥があるかの判別が容易となり、又、呈色部分の形状から、例えば皺による欠陥か、擦れによる欠陥かを判断する極めて有効な判断材料となる。又、この呈色は極めて短時間に起こり、問題のない範囲で加温することで、呈色をより高速におこす事が可能になる。 Next, the reason why the coloring by iodine is selected in the present invention will be described. One method for analyzing organic compounds using iodine is thin layer chromatography (TLC). In TLC, various color formers are used for visually confirming a very small amount of separated organic compounds. Of these, iodine is one of the best known. As a feature of the iodine color former, it turns from red brown to yellow and can be applied to a wide range of organic compounds. In addition, since iodine is sublimable and diffuses as a gas, it can enter a metal oxide vapor deposition layer in which plastic film has molecular gaps, pinholes or cracks. Therefore, an iodine color-developing material for producing iodine is provided on one side of the transparent gas barrier film having the metal oxide vapor-deposited layer having the defects as described above, and the metal oxide vapor-deposited layer is formed from the other side. By contacting the iodine coloring material through the defective portion of the transparent gas barrier film, the iodine coloring material is colored from reddish brown to yellow in the portion where the iodine has reached through the defective portion, and the defective portion becomes visible. . This makes it easy to determine which position of the transparent gas barrier film having the metal oxide vapor-deposited layer is defective, and from the shape of the colored portion, for example, it is extremely difficult to determine whether it is a defect due to wrinkles or a defect due to rubbing. It is an effective judgment material. In addition, this coloration occurs in a very short time, and it is possible to perform coloration at a higher speed by heating within a range where there is no problem.
本発明においては、前述したように沃素呈色材料として、分子鎖中に不飽和結合を有する材料からなる粘着剤を用いる。この粘着剤として、酢酸ビニル系粘着剤、エチレン酢酸ビニル系粘着剤、アクリル系粘着剤、スチレンアクリル系粘着剤、ウレタン系粘着剤、エポキシ系粘着剤、ポリエステル系粘着剤、シアノアクリレート系粘着剤の少なくとも一種が挙げられる。 In the present invention, as described above, an adhesive made of a material having an unsaturated bond in the molecular chain is used as the iodine coloring material. As this adhesive, vinyl acetate adhesive, ethylene vinyl acetate adhesive, acrylic adhesive, styrene acrylic adhesive, urethane adhesive, epoxy adhesive, polyester adhesive, cyanoacrylate adhesive There is at least one kind.
又、沃素呈色材料に直接沃素が接触すると、即座に黄色に染まってしまい、欠陥箇所の特定が出来なくなるため保護フィルムで覆う必要がある。
そのため、本発明においては、保護フィルムとして、そのガス透過度が、金属酸化物蒸着層を有する透明ガスバリアフィルムの基材フィルムのガス透過度より低いものを用いることが望ましい。
Further, when iodine is brought into direct contact with the iodine coloring material, it is immediately dyed yellow, and it becomes impossible to specify the defective portion, so it is necessary to cover it with a protective film.
Therefore, in the present invention, it is desirable to use a protective film whose gas permeability is lower than the gas permeability of the base film of the transparent gas barrier film having the metal oxide deposited layer.
本発明による欠陥箇所の検査は、例えば、エチレン、ポリプロピレン。ブテン等の単独重合体又は共重合体等のポリオレフィン樹脂、環状ポリオレフィン等の非晶質ポリオレフィン樹脂、ポリエチレンテレフタレート、ポリエチレン2,6−ナフタレート等のポリエステル系樹脂、ナイロン6、ナイロン12、共重合ナイロン等のポリアミド樹脂、ポリビニルアルコール樹脂、エチレン−ビニルアルコール共重合体等のポリビニルアルコール系樹脂、ポリイミド樹脂、ポリエーテルイミド樹脂、ポリサルフォン樹脂、ポリエーテルサルフォン樹脂、ポリエーテルエーテルケトン樹脂、ポリカーボネート樹脂、ポリビニルブチラート樹脂、ポリアリレート樹脂、エチレン−四フッ化エチレン共重合体、三フッ化塩化エチレン、四フッ化エチレン−パーフルオロアルキルビニルエーテル共重合体等のフッ素系樹脂からなる基材フィルムに酸化アルミニウム、酸化亜鉛、酸化アンチモン、酸化インジウム、酸化セリウム、酸化カルシウム、酸化カドミウム、酸化銀、酸化クロム、酸化珪素、酸化コバルト、酸化ジルコニウム、酸化錫、酸化チタン、酸化鉄、酸化銅、酸化ニッケル、酸化白金、酸化パラジウム、酸化ビスマス、酸化マグネシウム、酸化マンガン、酸化モリブデン、酸化バナジウム、酸化バリウム等の蒸着層を有する透明ガスバリアフィルムに対して適用することができる。 The defect inspection according to the present invention is, for example, ethylene or polypropylene. Polyolefin resins such as homopolymers or copolymers such as butene, amorphous polyolefin resins such as cyclic polyolefins, polyester resins such as polyethylene terephthalate and polyethylene 2,6-naphthalate, nylon 6, nylon 12, copolymer nylon, etc. Polyamide resin, polyvinyl alcohol resin, polyvinyl alcohol resin such as ethylene-vinyl alcohol copolymer, polyimide resin, polyetherimide resin, polysulfone resin, polyethersulfone resin, polyetheretherketone resin, polycarbonate resin, polyvinyl butyrate From fluorine-based resins such as acrylate resin, polyarylate resin, ethylene-tetrafluoroethylene copolymer, ethylene trifluoride chloride, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer Aluminum oxide, zinc oxide, antimony oxide, indium oxide, cerium oxide, calcium oxide, cadmium oxide, silver oxide, chromium oxide, silicon oxide, cobalt oxide, zirconium oxide, tin oxide, titanium oxide, iron oxide, The present invention can be applied to a transparent gas barrier film having a vapor deposition layer such as copper oxide, nickel oxide, platinum oxide, palladium oxide, bismuth oxide, magnesium oxide, manganese oxide, molybdenum oxide, vanadium oxide, and barium oxide.
又、保護フィルムとして、保護フィルム自体が沃素によって過剰に呈色すると欠陥箇所の識別が困難となるため、染まりにくい透明なポリエステル(PET)フィルムや延伸ポリエステル(OPP)フィルム等が望ましい。 Further, as the protective film, when the protective film itself is excessively colored with iodine, it becomes difficult to identify a defective portion, and therefore, a transparent polyester (PET) film or an oriented polyester (OPP) film that is difficult to be dyed is desirable.
厚さ12μの600mm幅の酸化アルミニウム蒸着PETフィルムのウェブをスリッターの巻き出し側に取付け、前記酸化アルミニウム蒸着PETフィルムを、下記の条件にて巻き取り側に巻き取り、それぞれモコン法により、酸素透過度及び水蒸気透過度を測定した。
条件(1):巻き取り側の巻き取り紙管に1mmφの針金を予め巻いておき、前記酸化アルミニウム蒸着PETフィルムを巻き取る。
条件(2):巻き出し側と巻き取り側の間のガイドロールを回転しないように固定して巻き出し側から巻き取り側に送られる酸化アルミニウム蒸着PETフィルムの蒸着面を擦る。
又、条件(1)及び条件(2)の条件の下に巻き取ったものから試験片を採取し、蒸着面に50μ厚のPET粘着テープを貼り付けてサンプルを作製した。このサンプルを100mlのスクリューキャップガラス瓶内に沃素0.2gと共に封入し、40℃のオーブンで10分間加温した。加温後、オーブンの外にガラス瓶を取り出し、室温まで冷却させた。その後、目視により、粘着剤の呈色の状態を観察した。
A 12 mm thick 600 mm wide aluminum oxide-deposited PET film web is attached to the slitter unwinding side, and the aluminum oxide-deposited PET film is wound on the winding side under the following conditions. And water vapor permeability were measured.
Condition (1): A 1 mmφ wire is previously wound around a winding paper tube on the winding side, and the aluminum oxide vapor deposited PET film is wound up.
Condition (2): The guide roll between the unwinding side and the winding side is fixed so as not to rotate, and the deposition surface of the aluminum oxide vapor deposited PET film sent from the unwinding side to the winding side is rubbed.
In addition, a test piece was collected from what was wound up under conditions (1) and (2), and a 50 μm thick PET adhesive tape was attached to the vapor deposition surface to prepare a sample. This sample was sealed in a 100 ml screw cap glass bottle together with 0.2 g of iodine and heated in an oven at 40 ° C. for 10 minutes. After heating, the glass bottle was taken out of the oven and allowed to cool to room temperature. Thereafter, the colored state of the pressure-sensitive adhesive was observed visually.
(比較例)
実施例と同様にして、但し巻き取り側の紙管には何も付けず、通常通り巻き取ったものから採取したサンプルを作製した。このサンプルを同様に100mlのスクリューキャップガラス瓶内に沃素0.2gと共に封入し、40℃のオーブンで10分間加温した。加温後、オーブンの外にガラス瓶を取り出し、室温まで冷却させた。その後、目視により、粘着剤の呈色の状態を観察した。
(Comparative example)
In the same manner as in the example, except that nothing was attached to the paper tube on the winding side, and a sample collected from what was wound up as usual was prepared. Similarly, this sample was sealed in a 100 ml screw cap glass bottle together with 0.2 g of iodine and heated in an oven at 40 ° C. for 10 minutes. After heating, the glass bottle was taken out of the oven and allowed to cool to room temperature. Thereafter, the colored state of the pressure-sensitive adhesive was observed visually.
実施例において条件(1)の下に巻き取ったものから採取したサンプルAについては、針金が接触してこぶ上になった箇所に対応した粘着剤の部分に茶色の呈色が観察された。
又、実施例において条件(2)の下に巻き取ったものから採取したサンプルBについては、流れ方向の線状の茶色の呈色が観察された。
With respect to Sample A collected from the sample wound under the condition (1) in the examples, a brown color was observed in the portion of the adhesive corresponding to the portion on the hump due to the contact of the wire.
Moreover, about the sample B extract | collected from what was wound up under conditions (2) in the Example, the linear brown coloration of the flow direction was observed.
それに対し比較例の巻き取り側の紙管には何も付けず、通常通り巻き取ったものから採取したサンプルCについては呈色は見出されなかった。 On the other hand, nothing was attached to the paper tube on the winding side of the comparative example, and no color was found for sample C collected from the winding as usual.
、ガス透過度の測定結果は表1に示す。 The measurement results of gas permeability are shown in Table 1.
表1に示すように、サンプルAの場合、酸素透過度は17.4cc、水蒸気透過度は8gと、ストレスをかけなかったサンプルCの酸素透過度2.4cc、水蒸気透過度3.0gに比べてバリア性は劣ることが分かる。又、サンプルBの場合、酸素透過度は42.5cc、水蒸気透過度は28gであり、さらにバリア性が劣ることがわかる。 As shown in Table 1, in the case of sample A, the oxygen permeability is 17.4 cc and the water vapor permeability is 8 g, which is 2.4 cc and the water vapor permeability of 3.0 g of the sample C which is not stressed. Thus, the barrier property is inferior. In the case of Sample B, the oxygen permeability is 42.5 cc, the water vapor permeability is 28 g, and the barrier property is inferior.
この発明は、飲食店などに限らず精密工業部品など、酸素や水分を嫌う製品を包装する包装容器の材料として利用される、金属酸化物蒸着層を有する透明ガスバリアフィルムの蒸着膜のクラックやピンホール等の欠陥箇所を検出し、バリア不良品の流出を防止し、又、バリア不良の発生原因を調査し、原因を取り除くことに活用することができる。
The present invention is not limited to restaurants and the like, but is used as a material for packaging containers for packaging products that are sensitive to oxygen and moisture, such as precision industrial parts, cracks and pins in a vapor deposition film of a transparent gas barrier film having a metal oxide vapor deposition layer It can be used to detect defective parts such as holes, prevent the outflow of defective barrier products, investigate the cause of barrier failure, and eliminate the cause.
Claims (4)
Adhesive is at least vinyl acetate adhesive, ethylene vinyl acetate adhesive, acrylic adhesive, styrene acrylic adhesive, urethane adhesive, epoxy adhesive, polyester adhesive, cyanoacrylate adhesive The defect detection method according to claim 1, wherein the defect detection method is a single type.
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JPH03165260A (en) * | 1989-11-22 | 1991-07-17 | Nissha Printing Co Ltd | Plate for thin-layer chromatography and production thereof |
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