JPH06227546A - Lid for easy-to-open can - Google Patents
Lid for easy-to-open canInfo
- Publication number
- JPH06227546A JPH06227546A JP1147793A JP1147793A JPH06227546A JP H06227546 A JPH06227546 A JP H06227546A JP 1147793 A JP1147793 A JP 1147793A JP 1147793 A JP1147793 A JP 1147793A JP H06227546 A JPH06227546 A JP H06227546A
- Authority
- JP
- Japan
- Prior art keywords
- lid
- resin layer
- easy
- open
- aluminum plate
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、耐蝕性、耐フェザーリ
ング性及びフレーバー性に優れたイージーオープン缶用
蓋に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for an easy open can which is excellent in corrosion resistance, feathering resistance and flavor.
【0002】[0002]
【従来技術とその課題】指でつまんで容易に開封できる
イージーオープン缶が、飲料缶等として多数使用されて
いる。このようなイージーオープン缶用蓋材としては、
通常、アルミニウム板の表面にエポキシユリア樹脂系塗
料、熱硬化性ビニル樹脂系塗料、塩化ビニルオルガノゾ
ル系塗料等にて塗装された塗装アルミニウム板を蓋の形
状に冷間加工されたものが用いられている。2. Description of the Related Art Easy-open cans, which can be easily opened by pinching them with fingers, are widely used as beverage cans and the like. As a lid material for such an easy open can,
Usually, a coated aluminum plate coated with epoxy urea resin-based paint, thermosetting vinyl resin-based paint, vinyl chloride organosol-based paint, etc. on the surface of the aluminum plate is cold-worked into the shape of the lid is used. ing.
【0003】しかしながら、上記塗装アルミニウム板
は、アルミニウムに対する腐蝕性の穏やかな内容物の場
合には、特に品質上の問題はないが、アルミニウムに対
する腐蝕性の強い内容物の場合には、塗装される被膜の
厚みを厚くすることがなされ、開封時に開口部に塗膜が
千切れてフェザーと言われる膜残りが発生し、いわゆる
耐フェザーリング性に劣るという問題があった。However, the above-mentioned coated aluminum plate has no particular quality problem in the case of contents that are corrosive to aluminum, but it is painted in the case of contents that are corrosive to aluminum. Since the thickness of the coating film is increased, the coating film is torn at the opening when opening and a film residue called feather is generated, which is a problem of poor so-called feathering resistance.
【0004】ここで、上記問題を解決するため、塗装に
変えて変性ポリオレフィン樹脂層を接着層としてポリオ
レフィン樹脂層をアルミニウム板に熱圧着する技術が提
案されている(特開平1−152057号)が、ポリオ
レフィン樹脂独特の臭気が内容物に移り、フレーバー性
に劣る傾向が見られた。In order to solve the above problem, a technique has been proposed in which the modified polyolefin resin layer is used as an adhesive layer instead of coating, and the polyolefin resin layer is thermocompression-bonded to an aluminum plate (JP-A-1-152057). , The odor peculiar to the polyolefin resin was transferred to the contents, and the flavor was inferior.
【0005】[0005]
【課題を解決するための手段】本発明は、上記問題点を
解消できるイージーオープン缶用蓋を見出したものであ
りその要旨とするところは、アルミニウム板の少なくと
も片面に、エポキシ樹脂、脂肪酸またはヒドロキシ置換
フェノールからなる薄膜を350℃以上の温度で熱処理
した熱変性被膜を介してポリアミド樹脂層またはポリア
ミド樹脂層とエチレン−ビニルアルコール共重合体樹脂
層を順次被覆してなる積層体を、樹脂層が内面となるよ
うに冷間加工してなるイージーオープン缶用蓋にある。DISCLOSURE OF THE INVENTION The present invention has found a lid for an easy open can which can solve the above problems, and its gist is to provide an epoxy resin, a fatty acid or a hydroxy group on at least one side of an aluminum plate. A resin layer is a laminate in which a polyamide resin layer or a polyamide resin layer and an ethylene-vinyl alcohol copolymer resin layer are sequentially coated through a heat-modified coating obtained by heat-treating a thin film of substituted phenol at a temperature of 350 ° C. or higher. It is on the lid for an easy open can that is cold-worked so that it becomes the inner surface.
【0006】以下、本発明を詳細に説明する。本発明で
使用するアルミニウム板は、加工性や強度面からアルミ
ニウムとマグネシウムとの合金(JISH0001によ
る5000系)が好適に使用される。またアルミニウム
板表面には通常のクロメート処理、ジルコニゥム処理や
チタネート処理などの化成処理や電解エッチングなどの
物理的表面処理を施してもよい。 板厚は、0.2〜
0.4mm、好ましくは0.25〜0.35mmのもの
が好適に使用できる。The present invention will be described in detail below. As the aluminum plate used in the present invention, an alloy of aluminum and magnesium (5000 series according to JIS H0001) is preferably used in terms of workability and strength. The surface of the aluminum plate may be subjected to conventional chromate treatment, chemical conversion treatment such as zirconium treatment or titanate treatment, or physical surface treatment such as electrolytic etching. Plate thickness is 0.2-
Those having a thickness of 0.4 mm, preferably 0.25 to 0.35 mm can be suitably used.
【0007】上記アルミニウム板の少なくとも片面には
特定の熱変性被膜を介してポリアミド樹脂層またはポリ
アミド樹脂層とエチレン−ビニルアルコール共重合体樹
脂層を順次被覆する必要がある。熱変性被膜はエポキシ
樹脂、脂肪酸またはヒドロキシ置換フェノールからなる
薄膜を350℃以上の温度で熱処理して得るものであ
り、熱処理温度が350℃未満ではアルミニウム板表面
とポリアミド樹脂層との接着性の改良がみられず、開封
時に膜残りが大となり、耐フェザーリング性に劣る。At least one surface of the aluminum plate must be coated with a polyamide resin layer or a polyamide resin layer and an ethylene-vinyl alcohol copolymer resin layer in that order through a specific heat-modified coating. The heat-modified coating is obtained by heat-treating a thin film made of an epoxy resin, a fatty acid or a hydroxy-substituted phenol at a temperature of 350 ° C or higher, and when the heat-treatment temperature is lower than 350 ° C, the adhesion between the aluminum plate surface and the polyamide resin layer is improved. No feathers are observed and the film remains large when opened, resulting in poor feathering resistance.
【0008】ここで、薄膜に使用するエポキシ樹脂とし
ては、ビスフェノールAとエピクロルヒドリンからなる
ビスフェノール型エポキシ樹脂で分子量が330〜30
00のものが好適に使用でき、脂肪酸としては、パルミ
チン酸、ステアリン酸、オレイン酸、ヒドロキシ置換フ
ェノールとしてはサリチルアルコール、ヒドロキシメチ
ルクレゾール等が挙げられる。薄膜は通常のロールコー
ターにより塗布すればよい。The epoxy resin used for the thin film is a bisphenol type epoxy resin composed of bisphenol A and epichlorohydrin and has a molecular weight of 330 to 30.
No. 00 is preferably used, and examples of the fatty acid include palmitic acid, stearic acid, oleic acid, and examples of the hydroxy-substituted phenol include salicyl alcohol and hydroxymethylcresol. The thin film may be applied by an ordinary roll coater.
【0009】本発明で使用するポリアミド樹脂として
は、ナイロン6、ナイロン11、ナイロン12、ナイロ
ン66、ナイロン610、ナイロン612、ナイロン6
とナイロン66との共重合体等が好適に使用でき、さら
にポリアミド系エラストマー、耐衝撃性ナイロン等も使
用できる。ポリアミド樹脂層の厚みは、5〜100μm
の範囲、好ましくは10〜80μmのものが好適に使用
できる。The polyamide resin used in the present invention includes nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 612 and nylon 6.
A copolymer of nylon and nylon 66 can be preferably used, and a polyamide elastomer, impact-resistant nylon, etc. can also be used. The thickness of the polyamide resin layer is 5 to 100 μm
And the range of 10 to 80 μm is preferably used.
【0010】上記ポリアミド樹脂層にさらにエチレンと
ビニルアルコールとの共重合体(以下「EVOH」とい
う)を積層してもよく、さらに耐蝕性を改良できる。E
VOHはエチレン含量が20〜60モル%、好ましく
は、30〜50モル%のものが好適に使用できる。厚み
は5〜30μm、好ましくは10〜20μmのものが使
用できる。A copolymer of ethylene and vinyl alcohol (hereinafter referred to as "EVOH") may be further laminated on the polyamide resin layer to further improve the corrosion resistance. E
VOH having an ethylene content of 20 to 60 mol%, preferably 30 to 50 mol% can be suitably used. A thickness of 5 to 30 μm, preferably 10 to 20 μm can be used.
【0011】上記樹脂は熱変性被膜を介してアルミニウ
ム板表面に被膜されるが、被覆方法としては、通常の溶
融ラミネート方法によればよい。得られた積層体は、樹
脂層が内面となるように蓋の形状に冷間加工される。冷
間加工は通常の絞り加工法等により行えばよい。The above-mentioned resin is coated on the surface of the aluminum plate through a heat-denatured coating, and the coating method may be a usual melt laminating method. The obtained laminate is cold worked into the shape of a lid so that the resin layer is the inner surface. The cold working may be performed by an ordinary drawing method or the like.
【0012】以下本発明を実施例により説明する。The present invention will be described below with reference to examples.
【0013】[0013]
【実施例】 実施例1 アルミニウム板(A5052 厚み0.25mm)の表
面に燐酸、無水クロム酸及びフッ化物を含む処理液にて
40〜50℃の処理温度にてクロメート処理して、クロ
メート被膜量が10mg/m2 を有する表面処理アルミ
ニウム板が得られた。当該処理表面の片面にビスフェノ
ール型エポキシ樹脂(分子量380、エポキシ当量18
0〜200)を1,1,1トリクロロエタンで溶解した
後ロールコーターにて、塗布乾燥後の厚みが1μmとな
るように塗布した。上記アルミニウム板を400℃で熱
処理して変性させた後、ナイロン6フイルム(厚み40
μm)を溶融ラミネートした。Example 1 A surface of an aluminum plate (A5052 thickness: 0.25 mm) is chromated with a treatment liquid containing phosphoric acid, chromic anhydride and fluoride at a treatment temperature of 40 to 50 ° C. to obtain a chromate coating amount. A surface-treated aluminum plate having a value of 10 mg / m 2 was obtained. Bisphenol type epoxy resin (molecular weight 380, epoxy equivalent 18
0-200) was dissolved in 1,1,1 trichloroethane, and then coated with a roll coater so that the thickness after coating and drying was 1 μm. The aluminum plate was heat-treated at 400 ° C. to denature it, and then nylon 6 film (thickness 40
μm) was melt laminated.
【0014】得られた積層板を用いて、スコアー加工
(スコアー残存厚み、95μm),リベット取付け加工
をプレスにて行い、83mm径のイージーオープン缶用
蓋を成形した。得られた蓋により耐蝕性、耐フェザーリ
ング性及びフレーバー性を評価した。評価結果を表1に
示した。Using the obtained laminated plate, score processing (score remaining thickness, 95 μm) and rivet mounting processing were performed by a press to form a lid for an easy open can having a diameter of 83 mm. The obtained lid was used to evaluate corrosion resistance, feathering resistance, and flavor resistance. The evaluation results are shown in Table 1.
【0015】ここで、評価方法は下記の通りである。 [耐蝕性評価方法]1%食塩水中にて、蓋内面を陰極、
白金電極を陽極として取り付け、6Vの印加電圧をかけ
た時の10秒後に流れる電流値を測定した。The evaluation method is as follows. [Corrosion resistance evaluation method] In 1% saline, the inner surface of the lid is the cathode,
A platinum electrode was attached as an anode, and the value of current flowing 10 seconds after applying an applied voltage of 6 V was measured.
【0016】[耐フェザーリング性評価方法]缶本体上
部に上記蓋を巻締めして取り付けた。ついで缶を120
℃で90分間レトルト殺菌した前後で、実際に指で蓋を
開封した時の膜残りの発生状況を目視にて評価した。膜
残りが全くなかったもの(○)、膜残りが若干みられた
もの(△)膜残りが顕著にみられたもの(×)とした。[Evaluation Method for Feathering Resistance] The lid was wound around and attached to the upper portion of the main body of the can. Then 120 cans
Before and after the retort sterilization at 90 ° C. for 90 minutes, the occurrence of film residue when the lid was actually opened with a finger was visually evaluated. The film with no film residue (∘), the film with a slight film residue (Δ), the film with a significant film residue (×).
【0017】[フレーバー性評価方法]内容物として市
販のスポーツ飲料水を用い、缶内に収納し上記蓋を取り
付け、50℃で1月間保管した後、蓋を開封して、内容
物の臭気の有無をチェックした。 異臭が感じられなか
ったもの(○)、異臭が感じられたもの(×)とした。[Flavour Evaluation Method] Commercially available sports drinking water was used as the contents, the contents were stored in a can, the above-mentioned lid was attached, and the contents were stored at 50 ° C. for 1 month. Then, the lid was opened to remove the odor of the contents. I checked the existence. The case where no offensive odor was felt (○) and the case where unpleasant odor was felt (×) were set.
【0018】実施例2 アルミニウム板表面に被覆する樹脂層がナイロン6フイ
ルム(厚み30μm)を熱融着させた後、さらにその上
にエチレン含量が32モル%のEVOHフイルム(厚み
12μ)を溶融ラミネートした以外は実施例1と同一内
容でイージーオープン缶用蓋を構成した後、実施例1と
同様に評価テストを行なった。Example 2 A nylon 6 film (thickness: 30 μm) was heat-fused as a resin layer for coating the surface of an aluminum plate, and an EVOH film (thickness: 12 μm) having an ethylene content of 32 mol% was further melt-laminated thereon. After configuring a lid for an easy open can with the same contents as in Example 1 except for the above, an evaluation test was performed in the same manner as in Example 1.
【0019】実施例3 熱変性被膜をオレイン酸から形成した以外は実施例1と
同一内容でイージーオープン缶用蓋を構成した後、実施
例1と同様に評価テストを行なった。Example 3 An easy open can lid was constructed in the same manner as in Example 1 except that the heat-modified coating was formed from oleic acid, and then an evaluation test was conducted in the same manner as in Example 1.
【0020】比較例1 実施例1にてエポキシ樹脂を塗布加熱変性することな
く、直接ナイロン6フイルム(厚み40μm)を溶融ラ
ミネートした以外は実施例1と同一内容でイージーオー
プン缶用蓋を構成した後、実施例1と同様に評価テスト
を行なった。Comparative Example 1 A lid for an easy open can was constructed in the same manner as in Example 1 except that the nylon 6 film (thickness 40 μm) was directly melt-laminated in Example 1 without applying the epoxy resin and denaturing by heating. Then, an evaluation test was performed in the same manner as in Example 1.
【0021】比較例2 クロメート被膜量が10mg/m2 を有する表面化性処
理アルミニウム板(A5182−O 厚み0.25m
m)に塩ビオルガノゾル系塗料にて10μmの膜厚に塗
装し焼き付けした。Comparative Example 2 Surface-treated aluminum plate having a chromate coating amount of 10 mg / m 2 (A5182-O, thickness: 0.25 m)
m) was coated with a polyvinyl organosol paint to a film thickness of 10 μm and baked.
【0022】得られた塗装アルミ板にて、実施例1と同
様にイージーオープン缶用蓋を成形した後、実施例1と
同様に評価テストを行なった。After forming a lid for an easy open can on the obtained coated aluminum plate in the same manner as in Example 1, an evaluation test was conducted in the same manner as in Example 1.
【0023】比較例3 クロメート被膜量が10mg/m2 を有する表面化性処
理アルミニウム板(A5182−O 厚み0.25m
m)に厚さ50μmの積層フイルム(ポリプロピレン
層、40μm/酸変性ポリプロピレン層、10μm)
を、酸変性ポリプロピレン層がアルミニウム板側になる
ように熱融着により接着した後、実施例1と同様にイー
ジーオープン缶用蓋を成形し、実施例1と同様に評価テ
ストを行なった。Comparative Example 3 Surface-treated aluminum plate having a chromate coating amount of 10 mg / m 2 (A5182-O, thickness: 0.25 m)
m) laminated film having a thickness of 50 μm (polypropylene layer, 40 μm / acid-modified polypropylene layer, 10 μm)
Was bonded by heat fusion so that the acid-modified polypropylene layer was on the aluminum plate side, then a lid for an easy open can was molded in the same manner as in Example 1, and an evaluation test was performed in the same manner as in Example 1.
【0024】[0024]
【表1】 表1より、本発明の実施例1乃至実施例3については、
いずれの評価項目も優れていることが判る。これに対し
て、アルミニウム板に熱変性被膜を設けていない比較例
1、及び塩ビオルガノゾル系塗料による塗装品である比
較例2については、耐蝕性と耐フェザーリング性に劣
り、ポリオレフィン樹脂を被覆してなる比較例3につい
ては、耐蝕性と耐フェザーリング性は優れているが、フ
レーバー性に劣ることが判る。[Table 1] From Table 1, for Examples 1 to 3 of the present invention,
It can be seen that all evaluation items are excellent. On the other hand, in Comparative Example 1 in which the heat-modified coating is not provided on the aluminum plate and Comparative Example 2 which is a product coated with the vinyl organosol-based paint, the corrosion resistance and the feathering resistance are poor and the polyolefin resin is coated. In Comparative Example 3 prepared as above, the corrosion resistance and the feathering resistance are excellent, but the flavor is inferior.
【0025】[0025]
【発明の効果】上述したように本発明の蓋によれば耐蝕
性、耐フェザーリング性及びフレーバー性に優れてお
り、各種内容物を収納したイージーオープン缶用として
好適に使用できる。As described above, the lid of the present invention is excellent in corrosion resistance, feathering resistance and flavor resistance, and can be suitably used for an easy open can containing various contents.
Claims (2)
ポキシ樹脂、脂肪酸またはヒドロキシ置換フェノールか
らなる薄膜を350℃以上の温度で熱処理した熱変性被
膜を介してポリアミド樹脂層を被覆した積層体を、樹脂
層が内面となるように冷間加工してなるイージーオープ
ン缶用蓋。1. A laminate in which a polyamide resin layer is coated on at least one surface of an aluminum plate with a heat-modified coating obtained by heat-treating a thin film made of an epoxy resin, a fatty acid or a hydroxy-substituted phenol at a temperature of 350 ° C. or higher, to form a resin layer. A lid for an easy open can that is cold-worked so that the inside becomes.
ポキシ樹脂、脂肪酸またはヒドロキシ置換フェノールか
らなる薄膜を350℃以上の温度で熱処理した熱変性被
膜を介してポリアミド樹脂層とエチレン−ビニルアルコ
ール共重合体樹脂層を順次被覆してなる積層体を、エチ
レン−ビニルアルコール共重合体樹脂層樹脂層が最内面
となるように冷間加工してなるイージーオープン缶用
蓋。2. A polyamide resin layer and an ethylene-vinyl alcohol copolymer resin via a heat-modified coating obtained by heat-treating a thin film of epoxy resin, fatty acid or hydroxy-substituted phenol at a temperature of 350 ° C. or higher on at least one surface of an aluminum plate. A lid for an easy-open can, which is obtained by cold-processing a laminated body formed by sequentially coating layers so that an ethylene-vinyl alcohol copolymer resin layer has a resin layer as the innermost surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1147793A JPH06227546A (en) | 1993-01-27 | 1993-01-27 | Lid for easy-to-open can |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1147793A JPH06227546A (en) | 1993-01-27 | 1993-01-27 | Lid for easy-to-open can |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06227546A true JPH06227546A (en) | 1994-08-16 |
Family
ID=11779151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1147793A Pending JPH06227546A (en) | 1993-01-27 | 1993-01-27 | Lid for easy-to-open can |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06227546A (en) |
-
1993
- 1993-01-27 JP JP1147793A patent/JPH06227546A/en active Pending
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