JP6683260B2 - 容器用樹脂被膜金属板 - Google Patents
容器用樹脂被膜金属板 Download PDFInfo
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- JP6683260B2 JP6683260B2 JP2018543732A JP2018543732A JP6683260B2 JP 6683260 B2 JP6683260 B2 JP 6683260B2 JP 2018543732 A JP2018543732 A JP 2018543732A JP 2018543732 A JP2018543732 A JP 2018543732A JP 6683260 B2 JP6683260 B2 JP 6683260B2
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/102—Oxide or hydroxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/538—Roughness
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- B32B2307/552—Fatigue strength
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- B32B2307/00—Properties of the layers or laminate
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- B32B2307/75—Printability
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
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Description
(2)C量が0.010%以上0.10%以下程度の範囲内にある低炭素鋼を用い、連続焼鈍で再結晶焼鈍したもの。
(3)C量が0.010%以上0.10%以下程度の範囲内にある低炭素鋼を用い、連続焼鈍で再結晶焼鈍及び過時効処理したもの。
(4)C量が0.010%以上0.10%以下程度の範囲内にある低炭素鋼を用い、箱焼鈍又は連続焼鈍で再結晶焼鈍した後、2次冷間圧延(DR(Double Reduced)圧延)したもの。
(5)C量が概ね0.003%以下程度の極低炭素鋼にNb、Ti等の固溶したCを固定する元素を添加したIF(Interstitial Free)鋼を用い、連続焼鈍で再結晶焼鈍したもの。
(2)共重合ポリエステルに添加し、溶融混練する方法
(3)方法(1),(2)において、酸化チタンを多量に添加したマスターペレットを製造し、粒子を含有しない共重合ポリエステルと混練し、所定量の酸化チタンを含有させる方法
示差走査熱量測定装置を用いて10℃/分の昇温速度で室温から290℃まで被覆前の樹脂被膜層を昇温した時の吸熱ピークを測定し、200℃以上280℃以下の範囲内で測定された吸熱ピークのピーク温度を樹脂被膜層の融点とした。また、結晶化温度は、金属板に被覆後の樹脂被覆層を金属板から剥離し、10℃/分の昇温速度で室温から290℃まで昇温した時の発熱ピークを測定し、80℃以上200℃以下の範囲内で測定された発熱ピークのピーク温度を樹脂被膜層の結晶化温度とした。
分光色差計を用いて容器用樹脂被膜金属板の樹脂被膜層の白色度をJIS Z 8722に示される方法で評価した。測定面積は8mmφ、測定光源をC条件、測定光源に対し2°視野の観察条件で測定したハンター(Hunter)Lab値のL値を白色度とした。
容器用樹脂被膜金属板を90秒間で240℃になるように熱風乾燥炉にて熱処理を行い、室温まで冷却した。その後、容器外面側に位置する樹脂被膜層の25℃における水接触角を評価した。
容器用樹脂被膜金属板の容器外面側の樹脂被膜表面(樹脂被膜層3)に導電性を付与するためにカーボンを蒸着した。カーボン蒸着後の樹脂被膜層3の表面を電界放出形走査電子顕微鏡(FE−SEM)を用いて、加速電圧5.0kV、倍率500倍の反射電子像を10視野観察し、単位面積当たりの無機粒子の粒子数の平均値を求めた。
容器用樹脂被膜金属板の容器外面側の樹脂被膜表面(樹脂被膜層3)の算術平均粗さ(Ra)を、(株)キーエンス社製レーザー顕微鏡(VK−X100)を用いて測定した。レーザー顕微鏡の倍率は1000倍で、測定視野は270μm(鋼板圧延方向)×200μm(鋼板幅方向)の範囲で、鋼板圧延方向5ヵ所、鋼板幅方向5ヵ所の表面粗さを測定し、平均値を求めた。レーザー顕微鏡装置付属のソフトウェアにより、JIS B 0601に準拠した条件で平均値を求めた。
上記実施例1〜22及び比較例1〜10の容器用樹脂被膜金属板について、以下に示す方法を利用して成形性、加工後密着性、及び印刷性を評価した。評価結果を以下の表2に示す。表2に示すように、実施例1〜22の容器用樹脂被膜金属板では、成形性、加工後密着性、及び印刷性の評価は良好であったが、比較例1〜10の容器用樹脂被膜金属板は、成形性、加工後密着性、及び印刷性のうちのいずれかの評価が不十分であった。
実施例1〜22及び比較例1〜10の容器用樹脂被膜金属板にパラフィンワックスを塗布した後、直径123mmの円板を打ち抜き、カッピングプレス機で内径71mmφ、高さ36mmのカップに絞り成形した。次いでこのカップをDI成形装置に装入して、ポンチスピード200mm/s、ストローク560mmで再絞り加工及び3段階のアイアニング加工で総リダクション率51%(それぞれのリダクション23%、25%、25%)を行い、最終的に缶内径52mm、缶高さ90mmの缶を成形した。そして、成形後に樹脂被膜層表面の破断又は削れを目視で観察し、以下に示す基準に従って評点をつけた。
評点「◎」:削れが缶フランジ部分から1mm以内の高さ位置に発生した場合
評点「○」:削れが缶フランジ部分から1mmを超えて5mm以内の高さ位置に発生した場合
評点「△」:削れが缶フランジ部分から5mmを越えて20mm以内の高さ位置に発生した場合
評点「×」:削れが缶フランジ部分から20mmを越えた高さ位置まで発生した場合又は破胴が発生した場合
成形性評価において成形した深絞り缶の缶胴部からピール試験用のサンプル(幅15mm×長さ120mm)を切り出した。切り出したサンプルの長辺側端部から樹脂被膜層を一部剥離し、剥離した樹脂被膜層を樹脂被膜層が剥離された金属板とは反対方向(角度:180度)に開き、引張速度30mm/minでピール試験を行い、以下に示す基準に従って幅15mm当たりの密着力を評価した。密着力測定対象面は缶内面側とした。
評点「○」:0.98N/15mm以上、1.47N/15mm未満(0.10kgf/15mm以上0.15kgf/15mm未満)
評点「×」:0.98N/15mm未満(0.10kgf/15mm未満)
容器用樹脂被膜金属板にポリエステル系印刷用インク(赤色)を印刷し、200℃で2分間、熱風乾燥炉にて熱処理を行った後、室温まで冷却した。その後、印刷面の碁盤目剥離試験を行い、樹脂被膜層とポリエステル系印刷用インクとの密着性を評価した。剥離量に応じて以下の評点をつけた。
評点「◎」:剥離量3%以上10%未満
評点「○」:剥離量10%以上20%未満
評点「△」:剥離量20%以上50%未満
評点「×」:剥離量50%以上
2 金属板
3,4 樹脂被膜金属板
3a 最表面層(上層)
3b 中間層(主層)
3c 最下層(下層)
Claims (4)
- 金属板の両面に樹脂被膜層を備える容器用樹脂被膜金属板であって、
前記樹脂被膜層は融点が230℃以上254℃以下の範囲内にあるポリエステル樹脂を主成分とし、
成形加工後に容器の外側に位置する前記樹脂被膜層は、前記金属板に被覆された後の算術平均粗さ(Ra)が0.10μm以上1.0μm以下の範囲内にあり、且つ、前記金属板に被覆された後の結晶化温度が110℃以上125℃以下の範囲内にあり、且つ、前記金属板に被覆された後にさらに240℃で90秒間加熱した後の水接触角が55度以上80度以下の範囲内にある樹脂材料によって形成されており、
成形加工後に容器の外面側に位置する前記樹脂被膜層の表面に、平均粒子径が0.010μm以上3.0μm以下の範囲内にある無機粒子が100個/mm 2 以上1500個/mm 2 以下の範囲内存在する
ことを特徴とする容器用樹脂被膜金属板。 - 成形加工後に容器の外面側に位置する前記樹脂被膜層が、0.10質量%以下の範囲内のポリエチレンワックスを含有することを特徴とする請求項1に記載の容器用樹脂被膜金属板。
- 成形加工後に容器の外面側に位置する前記樹脂被膜層が、30質量%以下の範囲内の酸化チタンを含有することを特徴とする請求項1又は2に記載の容器用樹脂被膜金属板。
- 成形加工後に容器の外面側に位置する前記樹脂被膜層が、最表面層、中間層、及び最下層からなる少なくとも3層構造を有し、前記最表面層及び前記最下層の膜厚が1.0μm以上5.0μm以下の範囲内にあり、前記中間層の膜厚が6μm以上30μm以下の範囲内にあり、前記最表面層及び前記最下層が0質量%以上2質量%以下の範囲内の酸化チタンを含有し、前記中間層が10質量%以上30質量%以下の範囲内の酸化チタンを含有することを特徴とする請求項3に記載の容器用樹脂被膜金属板。
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |