JP3088507B2 - Film-laminated steel sheet for food cans - Google Patents
Film-laminated steel sheet for food cansInfo
- Publication number
- JP3088507B2 JP3088507B2 JP23661591A JP23661591A JP3088507B2 JP 3088507 B2 JP3088507 B2 JP 3088507B2 JP 23661591 A JP23661591 A JP 23661591A JP 23661591 A JP23661591 A JP 23661591A JP 3088507 B2 JP3088507 B2 JP 3088507B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- tin
- resin
- steel sheet
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Laminated Bodies (AREA)
- Electroplating Methods And Accessories (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、耐食性に優れ、また製
造コストを低減できる食缶用フィルムラミネート鋼板に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film-laminated steel plate for food cans which has excellent corrosion resistance and can reduce the production cost.
【0002】[0002]
【従来の技術】食缶としては、胴部と底部が一体となっ
た部品と蓋とからなる2ピース缶が多い。この2ピース
缶は次のような工程で製造される。 錫めっきされた鋼帯を所定寸法のシートに切断し
て、ぶりきシートを得る。2. Description of the Related Art As food cans, there are many two-piece cans having a body and a bottom part integrated with a lid and a lid. This two-piece can is manufactured by the following process. The tin-plated steel strip is cut into sheets of predetermined dimensions to obtain tinplate sheets.
【0003】 次に、シートの片面に熱硬化性樹脂を
塗布し焼付炉にて焼き付ける。この時シートは非塗装面
を支持具に立て掛けた状態で熱処理される。熱硬化性樹
脂としては、エポキシ樹脂をベースにしてフェノール系
樹脂,ユリア系樹脂,エステル系樹脂などを硬化剤とし
て配合したものが一般に使用されており、焼付炉での温
度条件は180 〜220 ℃×10〜20分である。このようにし
て一方の面の塗装・焼付けが完了すると、もう一方の面
の塗装・焼付けが同様に行われる。Next, a thermosetting resin is applied to one side of the sheet and baked in a baking furnace. At this time, the sheet is heat-treated with the unpainted surface leaning against the support. As the thermosetting resin, a resin in which a phenol resin, a urea resin, an ester resin, or the like is blended as a curing agent based on an epoxy resin is generally used, and the temperature condition in a baking furnace is 180 to 220 ° C. × 10 to 20 minutes. When the painting and baking of one surface is completed in this way, the painting and baking of the other surface are performed similarly.
【0004】 次に、缶外面に相当する面に印刷・焼
付けが施される。この印刷・焼付けは上記塗装・焼付け
と同じ要領で行われる。 次いで、プレス加工,DP(Drawing an
d Pressing)加工,DRD(Drawing
and Redrawing)加工,DTR(Dra
wing and Thin Redrawing)加
工などによる成形加工を行って、缶胴と缶底とが一体と
なった缶体を得る。Next, printing and baking are performed on a surface corresponding to the outer surface of the can. The printing and baking are performed in the same manner as the painting and baking. Next, press working, DP (Drawing an
d Pressing) processing, DRD (Drawing)
and Redrawing processing, DTR (Dra
Forming such as wing and thin drawing is performed to obtain a can body in which the can body and the can bottom are integrated.
【0005】 これに内容物を充填した後、別途製造
された蓋が取付けられる。After filling the contents, a separately manufactured lid is attached.
【0006】[0006]
【発明が解決しようとする課題】前述のように、ぶりき
シートには熱硬化性樹脂が塗装されて180 〜220 ℃×10
〜2 0 分という長時間の熱処理(焼付け)が施される。
この時、塗装膜は三次元の網目構造となって、充填物に
対して耐透過性(バリヤー性)に優れたものとなり耐食
性を発揮するが、加工性の点で問題があった。すなわ
ち、プレス加工などの成形加工を施すと、塗膜に微細な
き裂が発生したり損傷を受けたり、或いは塗膜が剥離し
たりすることがあり、その結果耐食性を十分に発揮でき
なくなることがしばしばあった。具体的には、腐食性の
強い内容物を充填すると黒変(SnS)や黒点(Fe
S)が発生することがある。特に、液状,ゲル状の食品
類を保存する場合には、缶体内面に1点の塗膜欠陥が存
在してもこの部分からの缶体金属素材の腐食が進行し、
内容食品のフレーバ低下や保存性の低下をきたすととも
に、加熱殺菌,熱水処理を施すと更に悪化し、商品価値
を失ってしまう。As described above, the tinplate sheet is coated with a thermosetting resin at 180 to 220 ° C. × 10 ° C.
Long-term heat treatment (baking) of ~ 20 minutes is performed.
At this time, the coating film has a three-dimensional network structure, is excellent in permeation resistance (barrier property) to the filler, and exhibits corrosion resistance, but has a problem in workability. That is, when a molding process such as press working is performed, a fine crack is generated or damaged in the coating film, or the coating film may be peeled off, and as a result, the corrosion resistance may not be sufficiently exhibited. Often there was. Specifically, when a highly corrosive content is filled, blackening (SnS) or black spot (Fe
S) may occur. In particular, when preserving liquid or gel foods, even if there is one point of coating defect on the inner surface of the can, corrosion of the metal body of the can from this portion proceeds,
In addition to lowering the flavor and shelf life of the content food, heat sterilization and hot water treatment further exacerbate and lose commercial value.
【0007】また、塗装に際しては前述したようにシー
ト毎に、しかも表裏の各面毎に長時間の熱処理を行うの
で、生産性が非常に悪いという問題点もあった。本発明
は上記従来技術の問題点に鑑みてなされたもので、成形
性に優れ、かつ生産性にも優れた食缶用フィルムラミネ
ート鋼板を提供することを目的とする。In addition, as described above, since a long-time heat treatment is performed for each sheet and for each of the front and back surfaces during coating, there has been a problem that productivity is extremely poor. The present invention has been made in view of the above-described problems of the conventional art, and has as its object to provide a film-laminated steel sheet for food cans that is excellent in moldability and productivity.
【0008】[0008]
【課題を解決するための手段】本発明は、錫付着量が
0.5〜2.8g/m2 の錫めっき鋼板に、金属クロム
5〜30mg/m2 ,クロム水和酸化物3〜10mg/
m2 を被覆し、その上に接着剤を介して無延伸ナイロン
フィルムを被覆した上、時効処理を施したことを特徴と
する。The present invention SUMMARY OF] is a tin-plated steel sheet of tin adhesion amount 0.5~2.8g / m 2, metallic chromium 5 to 30 mg / m 2, hydrated chromium oxide 3~10mg /
m 2 was coated, unstretched nylon with an adhesive thereon
It is characterized by being subjected to aging treatment after being covered with a film .
【0009】[0009]
【作用】本発明者らは、上記従来技術が有する問題点
は、塗料として熱硬化性樹脂を使用していることに原因
があると考えた。すなわち、耐食性を得るためには熱硬
化性樹脂のポリマー中にある未反応官能基を反応させて
ポリマー間の橋かけにより分子構造を三次元の網目構造
としなければならず、そのために長時間の熱処理を必要
とする。この焼付処理による熱硬化で加工性が悪くな
り、クラック等の欠陥が発生し易くなるものと考えたの
である。そこで本発明者らは、従来の熱硬化性樹脂に代
えて熱可塑性樹脂を用いることに想到した。この熱可塑
性樹脂は熱硬化は不要であるから、加工性は悪くならな
い。しかもフィルム状で提供されるから表面処理鋼帯を
予めシートに切断する必要はなく、鋼帯にフィルムを連
続的に接着剤を用いて貼付けることができるから、生産
性も大幅に向上できることになる。The present inventors have considered that the above-mentioned problems of the prior art are caused by using a thermosetting resin as a coating material. In other words, in order to obtain corrosion resistance, it is necessary to react unreacted functional groups in the polymer of the thermosetting resin to form a three-dimensional network structure by bridging between the polymers. Requires heat treatment. It was considered that the workability was deteriorated due to the heat curing by the baking treatment, and defects such as cracks were likely to occur. Therefore, the present inventors have conceived of using a thermoplastic resin instead of the conventional thermosetting resin. Since this thermoplastic resin does not require thermosetting, its workability does not deteriorate. Moreover, since it is provided in the form of a film, it is not necessary to cut the surface-treated steel strip into sheets in advance, and since the film can be continuously attached to the steel strip using an adhesive, productivity can be greatly improved. Become.
【0010】以下、更に詳細に述べる。プレス加工,深
絞り加工などの成形加工後にも高耐食性を維持するため
には、熱可塑性樹脂フィルムのぶりきに対する接着強度
を高める必要がある。そこで本発明では、接着剤を直接
ぶりきに塗布しないで、ぶりき面をクロメート処理して
からその上に接着剤を塗り、その後熱可塑性樹脂フィル
ムを貼付するようにした。これにより熱可塑性樹脂フィ
ルムの接着力を増強できるのである。Hereinafter, this will be described in more detail. In order to maintain high corrosion resistance even after forming such as pressing and deep drawing, it is necessary to increase the adhesive strength of the thermoplastic resin film against tinsel. Therefore, in the present invention, instead of directly applying the adhesive to the tinplate, the tinted surface is subjected to chromate treatment, the adhesive is applied thereon, and then the thermoplastic resin film is applied. Thereby, the adhesive strength of the thermoplastic resin film can be enhanced.
【0011】クロメート処理のためのめっき浴として
は、従来の重クロム酸ナトリウム(Na2Cr2 O7)よ
り無水クロム酸(CrO3)に少量の硫酸を加えた無水ク
ロム酸浴の方が良い。本発明者等の研究の結果、この無
水クロム酸浴を使用してぶりきに陰極電解処理を施すこ
とにより、接着強度が飛躍的に向上することが判明し
た。As a plating bath for chromate treatment, a chromic anhydride bath obtained by adding a small amount of sulfuric acid to chromic anhydride (CrO 3 ) is better than the conventional sodium dichromate (Na 2 Cr 2 O 7 ). . As a result of the study by the present inventors, it has been found that by applying a cathodic electrolytic treatment to a tinplate using this chromic anhydride bath, the adhesive strength is dramatically improved.
【0012】図1は、重クロム酸ナトリウム浴でめっき
処理した場合と、無水クロム酸浴でめっき処理した場合
とで、接着強度がどのように異なるかを比較試験した結
果を表したグラフである。グラフの実線は接着剤塗布量
2.8g/m2,点線は同1.0g/m2 のものである。また、金属ク
ロム付着層の上には、厚み3 〜10mg/m2 程度の水和酸化
クロム層が形成された。重クロム酸ナトリウム浴でめっ
き処理した場合のTピール強度試験測定値は、2 kg/5mm
以下であった。一方、無水クロム酸浴で処理した場合
は、金属クロム付着量を5mg/m2以上に増加させると、T
ピール強度は急激な上昇を示し、接着強度の極めて大き
な向上が見られた。その後ほぼ飽和状態になり、30mg/m
2 を越えると、もはやTピール強度の大幅な改善は認め
られなかった。また、金属クロム付着量が多くなるとぶ
りきの色調が暗くなり、ぶりきの特長がなくなってしま
うことが確認された。更に、金属クロムは硬度が著しく
高いから、付着量が多過ぎると、その後のプレス成形工
程において金属クロム層にき裂が入る可能性が大きくな
る。FIG. 1 is a graph showing the results of a comparison test of how the adhesive strength differs between plating with a sodium dichromate bath and plating with an anhydrous chromic acid bath. . The solid line in the graph is the amount of adhesive applied
2.8 g / m 2 , and the dotted line is 1.0 g / m 2 . A hydrated chromium oxide layer having a thickness of about 3 to 10 mg / m 2 was formed on the metal chromium adhesion layer. The measured value of T peel strength test when plating in sodium dichromate bath is 2 kg / 5 mm
It was below. On the other hand, in the case of treatment with a chromic anhydride bath, increasing the chromium metal deposit to 5 mg / m 2 or more
The peel strength showed a sharp increase, and an extremely large improvement in the adhesive strength was observed. After that, it became almost saturated, 30 mg / m
Beyond 2 , no significant improvement in T-peel strength was observed anymore. In addition, it was confirmed that when the amount of metal chromium was increased, the tint of tinplate became darker, and the characteristics of tinplate were lost. Further, since the hardness of chromium metal is extremely high, if the amount of the chromium metal is too large, the possibility of cracking the chromium metal layer in the subsequent press molding step increases.
【0013】そこで、金属クロム付着量としては、5 〜
30mg/m2 が最適の範囲である。このように、金属クロム
付着量を5mg/m2以上にすることで接着強度が改善できた
理由は、次のように考えられる。すずめっき表層にはす
ず酸化物(SnO,SnO2)が形成されるが、その強度
がもろいため凝集破壊して接着強度を低下させる。しか
し、そのすずめっき層にクロメート処理を施すにあた
り、本発明の方法すなわち無水クロム酸浴を用いて高い
電流密度で陰極電解処理を施すと、金属クロム析出量が
多くなると共に、すず酸化物の量が激減する。その結
果、接着強度が向上する。Therefore, the amount of deposited chromium metal is 5 to
30 mg / m 2 is the optimal range. The reason why the adhesive strength was improved by setting the amount of chromium metal adhered to 5 mg / m 2 or more is considered as follows. Tin oxide (SnO, SnO 2 ) is formed on the surface of the tin plating, but its strength is fragile, which causes cohesive failure and lowers the adhesive strength. However, when performing the chromate treatment on the tin plating layer, if the method of the present invention, ie, the cathodic electrolysis treatment is performed at a high current density using a chromic anhydride bath, the amount of deposited metal chromium increases and the amount of tin oxide increases. Decreases sharply. As a result, the adhesive strength is improved.
【0014】また、金属クロム層の上に僅かな量で形成
される水和酸化クロム層は、そのOH基が接着剤との結
合をもたらすものであり、金属クロム層に一定量が均一
に分布することが望ましい。その付着量の下限値は3 mg
/m2 であり、この値未満では金属クロム層への均一な分
布が難しい。また、上限値は10mg/m2 であり、この値を
越えると、色調が変化すると共にその後に接着された熱
可塑性樹脂フィルムの加工密着性が悪くなることが判明
した。In the hydrated chromium oxide layer formed in a small amount on the chromium metal layer, the OH group causes bonding to the adhesive, and a certain amount is uniformly distributed in the chromium metal layer. It is desirable to do. The lower limit of the amount is 3 mg
/ m 2 , and if it is less than this value, uniform distribution to the metal chromium layer is difficult. Also, the upper limit was 10 mg / m 2 , and it was found that when the upper limit was exceeded, the color tone changed and the processing adhesion of the thermoplastic resin film adhered thereafter deteriorated.
【0015】接着剤としては、熱硬化性樹脂を希釈剤に
溶かしたものを用いるが、この樹脂としてはフェノール
系樹脂,エポキシ系樹脂,ウレタン系樹脂の1種もしく
は2種以上を用いればよい。塗布後、ただちに乾燥炉で
キュアーさせると高い密着性が得られる。フィルムとし
ては、熱可塑性樹脂フィルム(以下、ラミネートフィル
ムという)を用いる。ラミネートフィルムとしては、ナ
イロン樹脂が好適である。その理由を述べると、ラミネ
ートフィルムに要求される性質には次のものがある。先
ず、成形加工を受けるので大きな伸度が必要である。ま
た、食缶の場合、内容物を充填後に高温(110 〜140
℃)殺菌されるし、また冷蔵庫で保管されたりするか
ら、耐熱性に優れ、低温時の強度に優れ、更に缶同士が
衝突してもクラックが入ったり破れたりしないように衝
突強度も大きくなければならない。以上の各特性を発揮
できるのはナイロン系樹脂であることから、本発明では
ナイロン系樹脂を好適とした。As the adhesive, a material obtained by dissolving a thermosetting resin in a diluent is used. As the resin, one or more of a phenol resin, an epoxy resin, and a urethane resin may be used. Immediately after the application, curing in a drying oven provides high adhesion. As the film, a thermoplastic resin film (hereinafter, referred to as a laminate film) is used. As the laminate film, a nylon resin is preferable. The reasons required for the laminated film include the following. First, a large elongation is required because of the forming process. In addition, in the case of food cans, after filling the contents, high temperatures (110 to 140
℃) Because it is sterilized and stored in a refrigerator, it has excellent heat resistance, excellent strength at low temperatures, and must have high impact strength to prevent cracking or tearing even if cans collide. Must. Since it is a nylon resin that can exhibit each of the above characteristics, the nylon resin is preferred in the present invention.
【0016】なお、熱可塑性樹脂フィルムとしては、ナ
イロン系以外に、ポリエチレンテレフタレート(PE
T)フィルムが良く知られている。このPETフィルム
はバリヤー性に優れ、各種内容物に対して良好な防食効
果を示す。しかし反面、このフィルムは成形性が悪く、
2ピース缶のような厳しい加工を受ける場合にはフィル
ムにクラックが入りやすく、加工性に限界がある。この
点、ナイロンフィルムは伸度が300 〜400 %(ASTM
−D882)もあり、過酷な成形加工にも耐えることが
できる。As the thermoplastic resin film, besides nylon, polyethylene terephthalate (PE)
T) Films are well known. This PET film has excellent barrier properties and exhibits a good anticorrosion effect on various contents. However, on the other hand, this film has poor moldability,
When subjected to severe processing such as a two-piece can, the film is easily cracked, and there is a limit in workability. In this respect, the nylon film has an elongation of 300 to 400% (ASTM).
-D882), which can withstand severe molding.
【0017】次に、本発明による食缶用フィルムラミネ
ート鋼板の製造方法について述べる。まず、所定板厚の
冷延鋼帯を電気すずめっきラインですずめっきし、その
後連続してクロメート処理を施す。次いで、接着剤を両
面に塗布して直ちに乾燥炉にて乾燥,キュアさせた後、
ラミネートフィルムを貼付け、接着特性を向上させるた
めに20〜180 ℃の温度によるエージング処理を施す。こ
のエージング処理によりフィルムは硬化するが、20℃未
満では硬化せず、上限は耐熱性の点から180 ℃とした。
エージング処理後は冷却して食缶用フィルムラミネート
鋼板となる。Next, a method for producing a film-laminated steel sheet for food cans according to the present invention will be described. First, a cold-rolled steel strip having a predetermined thickness is tin-plated on an electric tin plating line, and then subjected to a continuous chromate treatment. Then, after applying adhesive on both sides and immediately drying and curing in a drying oven,
A laminate film is attached and subjected to an aging treatment at a temperature of 20 to 180 ° C. in order to improve the adhesive properties. Although the film was cured by this aging treatment, it did not cure below 20 ° C., and the upper limit was 180 ° C. from the viewpoint of heat resistance.
After the aging treatment, the film is cooled to form a film-laminated steel plate for food cans.
【0018】以上の工程にて製造できるので、シート状
でコーティングを1枚1枚実施する必要は全くなく、連
続して製造できるので生産性を大幅に向上させることが
可能である。なお、ラミネートフィルムの厚みとして
は、通常50〜100 μmのものが一般に製造されており、
経済性の点では薄い方が好ましいが、特に本発明でその
厚みを限定するものではない。Since it can be manufactured by the above steps, it is not necessary to apply the coating one by one in the form of a sheet, and since it can be manufactured continuously, the productivity can be greatly improved. The thickness of the laminated film is usually 50 to 100 μm is generally manufactured,
Although a thinner one is preferable in terms of economy, the thickness is not particularly limited in the present invention.
【0019】また、本発明では、フィルムをぶりきに被
覆するようにしたため、ぶりき自体の錫目付量を大幅に
削減できる。すなわち従来の場合には、塗装膜の耐食性
を補うために錫目付量が5.6 g/m2,8.4 g/m2のぶりきが
使用されていたが、本発明では耐食性を十分なものにで
きるから、錫目付量を0.5 〜2.8 g/m2に削減でき、その
経済的効果は非常に大きいものがある。In the present invention, since the film is coated on the tinplate, the tinning weight of the tinplate itself can be greatly reduced. That is, in the conventional case, tinning with a tin weight of 5.6 g / m 2 or 8.4 g / m 2 was used to supplement the corrosion resistance of the coating film, but the present invention can provide sufficient corrosion resistance. Thus, the tin basis weight can be reduced to 0.5 to 2.8 g / m 2 , and the economic effect is very large.
【0020】[0020]
【実施例】板厚0.17 mm の冷延鋼板にハロゲン方式の電
気錫めっきラインで、錫めっきを施してぶりきに仕上げ
た。めっき量の異なるもの3種類とし、すず付着量を求
めた。めっき条件を表1に示す。EXAMPLE A cold-rolled steel sheet having a thickness of 0.17 mm was tin-plated with a halogen-type electric tin plating line to finish tinplate. Three types having different plating amounts were used, and the tin adhesion amount was determined. Table 1 shows the plating conditions.
【0021】[0021]
【表1】 [Table 1]
【0022】このぶりきに、連続してクロメート処理を
施した。同ぶりきを陰極とし、陽極にはFe電極を用
い、表2に示す組成のクロメート浴(無水クロム酸浴)
を使用し、表2に示す4水準の金属クロム付着量及び酸
化クロム付着量に見合う4水準の電流密度を設定して電
解処理した。The tinplate was subjected to a continuous chromate treatment. Chromate bath (chromic anhydride bath) having the composition shown in Table 2 using the same tinning as a cathode and an Fe electrode as an anode
The electrolytic treatment was performed by setting four levels of current density corresponding to the four levels of deposited metal chromium and the deposited amount of chromium oxide shown in Table 2.
【0023】[0023]
【表2】 [Table 2]
【0024】続いて、このようにしてCr層を形成して
仕上げたぶりきに、下記組成の接着剤を乾燥重量で5 g/
m2となるように塗布し、170 ℃×30秒の条件で乾燥さ
せ、直ちに厚さ20μmと50μmと100 μmの無延伸ナイ
ロン6フィルム(東レ合成フィルム(株)製,レイファ
ンNOT−1401)を貼付けてコイル状に巻き取っ
た。Subsequently, an adhesive having the following composition was added at a dry weight of 5 g /
m 2 , dried at 170 ° C. for 30 seconds, and immediately unstretched nylon 6 film having a thickness of 20 μm, 50 μm, and 100 μm (Toray Synthetic Film Co., Ltd., Leifan NOT-1401) Was affixed and wound up in a coil shape.
【0025】 〔接着剤〕 主 剤;ポリエステル樹脂,エポキシ樹脂 硬化剤;脂肪族系ポリイソアミド 混合比;主剤:硬化剤=15:2 その後、コイルに保熱用ボックスを被せて時効処理を行
って仕上げ、後述の各種評価項目について評価を行っ
た。[Adhesive] Main agent: polyester resin, epoxy resin Curing agent: aliphatic polyisoamide Mixing ratio: main agent: hardening agent = 15: 2 After that, the coil is covered with a heat retaining box and subjected to aging treatment to finish. The following various evaluation items were evaluated.
【0026】一方、比較のため従来法による供試材を製
造した。すなわち、前記と同様の板厚,錫目付量のぶり
きシートに対して、エポキシフェノール塗料を1回塗り
(5.0 g/m2)したものと、2回塗り(10.0g/m2)したも
のと、3回塗り(15.0g/m2)したものとの3種類用意
し、オーブンで210 ℃×10分の焼付け処理を行って比較
供試材とした。この場合、上記樹脂塗装を行わずに、表
2に示す第1水準のクロメート処理を施したものも、比
較例とした。On the other hand, a test material was produced by a conventional method for comparison. That is, a tinned sheet having the same thickness and tin weight as described above was coated once (5.0 g / m 2 ) with an epoxy phenol paint and twice (10.0 g / m 2 ). And three coatings (15.0 g / m 2 ) were prepared and baked in an oven at 210 ° C. for 10 minutes to obtain comparative test materials. In this case, a comparative example in which the first level chromate treatment shown in Table 2 was performed without performing the resin coating described above was also used.
【0027】以上のようにして得られた供試材を用い
て、以下の品質評価を行った。 1)碁盤目エリクセン試験 供試材の表面に約1mm間隔で11×11の碁盤目状の傷
を入れて、エリクセン試験機により8mmの張出し加工を
行ない、碗状に膨出させた部分にテープを貼付・剥離さ
せてその剥離状態を表3のように評価した。The following quality evaluation was carried out using the test materials obtained as described above. 1) Cross-cut Erichsen test 11 × 11 cross-cut scratches were made on the surface of the test material at intervals of about 1 mm, and 8 mm overhang processing was performed with an Erichsen tester, and tape was applied to the bowl-shaped bulging portion. Was adhered and peeled, and the peeled state was evaluated as shown in Table 3.
【0028】[0028]
【表3】 [Table 3]
【0029】2)1T折曲げ加工試験 デュポン衝撃機を用いて、供試材に重さ2.3 Kgの錘を3
0cmの高さから落下させて供試材を折曲げ、その加工後
の試験片を3%NaCl水溶液に電極(陰極)とともに
浸漬し、6Vの電圧を4秒間印加して電流値を評価し
た。金属露出部があれば、その露出面積に比例した電流
が流れることから、塗膜やフィルム層の破損の程度が判
定できる。2) 1T bending test Using a Dupont impact machine, a 2.3 kg weight was added to the test material by 3 weights.
The test material was bent by dropping from a height of 0 cm, and the processed test piece was immersed in a 3% NaCl aqueous solution together with an electrode (cathode), and a voltage of 6 V was applied for 4 seconds to evaluate a current value. If there is a metal exposed portion, a current proportional to the exposed area flows, so that the degree of damage of the coating film or the film layer can be determined.
【0030】3)加工性評価 供試材から直径80mmの円板を打ち抜いて絞り比2.0 で
円筒に加工した。この円筒に130 ℃×30分のレトルト殺
菌処理を施して内外面を目視により観察し、その結果疵
が1ヵ所でもあれば、或いはフィルム等が剥離していれ
ば、不合格とした。3) Evaluation of workability A circular plate having a diameter of 80 mm was punched out of the test material and processed into a cylinder at a drawing ratio of 2.0. This cylinder was subjected to a retort sterilization treatment at 130 ° C. for 30 minutes, and the inner and outer surfaces were visually observed. As a result, if any flaw was found, or if the film or the like was peeled off, it was rejected.
【0031】4)エナメルレーター試験 上記項目3)で得られた缶体内に、電解液として3%N
aCl水溶液を満たしてこの中に電極を漬け、缶体を陽
極として6Vの定電圧を4秒間印加し、この時流れる電
流値をもって金属露出部の面積を評価した。 5)実缶試験 缶体に市販のまぐろ油漬の内容物をリパックして、缶蓋
を二重巻き締めにより取付け、130 ℃×30分のレトルト
殺菌処理後、12ヵ月間50℃に保持した。その後、開
缶して内容物のフレーバー評価,腐食状況,フィルム等
の密着状況を調査した。4) Enamellator test In the can obtained in the above item 3), 3% N was used as an electrolyte.
The electrode was immersed in an aCl aqueous solution, and a constant voltage of 6 V was applied for 4 seconds using the can as an anode, and the area of the exposed metal portion was evaluated based on the current flowing at this time. 5) Actual can test The contents of a commercially available tuna oil pickle were repacked in a can body, the can lid was attached by double winding, and after retort sterilization at 130 ° C for 30 minutes, it was kept at 50 ° C for 12 months. Thereafter, the can was opened and the contents were evaluated for flavor, corrosion, and adhesion of the film and the like.
【0032】以上の評価試験の結果を表4に示す。Table 4 shows the results of the above evaluation tests.
【0033】[0033]
【表4】 [Table 4]
【0034】本発明によれば、過酷な試験評価を行った
にもかかわらず良好な結果が得られた。比較例のものに
ついては、樹脂塗装回数を3回まで増加したものでも欠
陥が見られた。上記実施例ではぶりきに適用したが、本
発明はクロムめっき鋼板にも適用することができる。According to the present invention, good results were obtained despite severe test evaluations. In the case of the comparative example, defects were observed even when the number of times of resin coating was increased up to three times. Although applied to tinplate in the above embodiment, the present invention can also be applied to chrome-plated steel sheets.
【0035】更に、本発明の食缶用フィルムラミネート
鋼板は、2ピース缶用に限定されるものではなく、3ピ
ース缶用にも適用できる。また、フィルムを表裏両面に
貼り付けるようにしてもよいのは勿論である。Furthermore, the film-laminated steel sheet for food cans of the present invention is not limited to two-piece cans, but can also be applied to three-piece cans. In addition, it goes without saying that the film may be attached to both the front and back surfaces.
【0036】[0036]
【発明の効果】本発明によれば、熱可塑性樹脂フィルム
である無延伸ナイロンフィルムを接着剤で貼り付けて2
ピース缶用素材としたため、従来の熱硬化性樹脂を塗布
して製造されるものに比べて大幅に生産性を向上させる
ことができる。また、錫目付量も大幅に減らすことがで
きるとともに、耐食性,加工性等にも非常に優れたもの
が得られる。According to the present invention, a thermoplastic resin film is provided.
A non-stretched nylon film that is
Since the material for a piece can is used, productivity can be greatly improved as compared with a material manufactured by applying a conventional thermosetting resin. In addition, the tin basis weight can be significantly reduced, and a material excellent in corrosion resistance, workability and the like can be obtained.
【図1】ブリキのクロメート処理とフィルム接着強度と
の関係を示すグラフである。FIG. 1 is a graph showing the relationship between tinplate chromate treatment and film adhesion strength.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI B32B 27/34 B32B 27/34 C23C 28/00 C23C 28/00 C C25D 5/26 C25D 5/26 (72)発明者 加藤 寿勝 千葉県千葉市川崎町1番地 川崎製鉄株 式会社千葉製鉄所内 (72)発明者 秋山 知彦 千葉県千葉市川崎町1番地 川崎製鉄株 式会社千葉製鉄所内 (72)発明者 鳴海 宏 千葉県千葉市川崎町1番地 川崎製鉄株 式会社千葉製鉄所内 (72)発明者 田中 誠 千葉県千葉市川崎町1番地 川崎製鉄株 式会社千葉製鉄所内 (72)発明者 落合 政信 千葉県千葉市川崎町1番地 川崎製鉄株 式会社千葉製鉄所内 (72)発明者 中谷 光義 千葉県千葉市塩田町385番地の1 川鉄 鋼板株式会社千葉工場内 審査官 鴨野 研一 (56)参考文献 特開 平3−180339(JP,A) (58)調査した分野(Int.Cl.7,DB名) B32B 1/00 - 35/00 C23C 28/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI B32B 27/34 B32B 27/34 C23C 28/00 C23C 28/00 C C25D 5/26 C25D 5/26 (72) Inventor: Hisashi Kato Katsu 1, Kawasaki-cho, Chiba-shi, Chiba Prefecture Kawasaki Steel Corporation Chiba Works (72) Inventor Tomohiko Akiyama 1, Kawasaki-cho, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works, Ltd. No. 1 Kawasaki-cho, Ichikawa-Kawasaki Steel Corporation Chiba Works, Ltd. (72) Inventor Makoto Tanaka No. 1, Kawasaki-cho, Chiba-shi, Chiba Prefecture Inside Chiba Works Chiba Works, Ltd. Address Kawasaki Steel Corporation Chiba Works (72) Inventor Mitsuyoshi Nakatani 385-1, Shioda-cho, Chiba City, Chiba Prefecture Kenichi Kamono (56) References JP-A-3-180339 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B32B 1/00-35/00 C23C 28/00
Claims (1)
めっき鋼板に、金属クロム5〜30mg/m2 ,クロム
水和酸化物3〜10mg/m2 を被覆し、その上に接着
剤を介して無延伸ナイロンフィルムを被覆した上、時効
処理を施したことを特徴とする食缶用フィルムラミネー
ト鋼板。1. A quantity of tin adhering to the tin-plated steel sheet 0.5~2.8g / m 2, metallic chromium 5 to 30 mg / m 2, the hydrated chromium oxide 3-10 mg / m 2 was coated, the After coating with a non-stretched nylon film via an adhesive , aging
A film-laminated steel plate for food cans , which has been treated .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23661591A JP3088507B2 (en) | 1991-09-17 | 1991-09-17 | Film-laminated steel sheet for food cans |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23661591A JP3088507B2 (en) | 1991-09-17 | 1991-09-17 | Film-laminated steel sheet for food cans |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0569508A JPH0569508A (en) | 1993-03-23 |
JP3088507B2 true JP3088507B2 (en) | 2000-09-18 |
Family
ID=17003270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23661591A Expired - Fee Related JP3088507B2 (en) | 1991-09-17 | 1991-09-17 | Film-laminated steel sheet for food cans |
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Country | Link |
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JP (1) | JP3088507B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3051670B2 (en) * | 1995-11-02 | 2000-06-12 | 東洋鋼鈑株式会社 | Manufacturing method of laminated steel sheet, laminated steel sheet and surface-treated steel sheet used therefor |
-
1991
- 1991-09-17 JP JP23661591A patent/JP3088507B2/en not_active Expired - Fee Related
Also Published As
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JPH0569508A (en) | 1993-03-23 |
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