WO2016093219A1 - 缶蓋用樹脂被覆金属板 - Google Patents
缶蓋用樹脂被覆金属板 Download PDFInfo
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Abstract
Description
まず、図1を参照し、本発明に適用されるレーザーラマン分光法の測定方法について説明する。図1に示すように、金属板1の両面に樹脂フィルム2がラミネートされた樹脂被覆金属板10において、一方の面の樹脂フィルム2に対して、レーザー発振器3から発振されたレーザー光4を入射し、散乱したラマン散乱光5を分光器6で分光する。レーザーラマン分光法で照射されるレーザー光4のビーム径はレンズ7により可変となっており、必要なサイズの領域の結晶化度の評価が可能となる。そして、照射されるレーザー光4のビーム径を絞ることによって、樹脂フィルム2の微小領域における結晶化度の評価が可能になる。本実施の形態では、図1に示すレーザーラマン分光法の測定方法により、樹脂フィルム2の厚さ方向断面の、任意の部位における結晶化度を評価した。
本発明の樹脂被覆金属板10の下地となる金属板1には、缶詰容器用材料として広く使用されている鋼板やアルミニウム板を用いることができる。金属板1には、各種の表面処理が施されていてもよく、特に下層が金属クロム、上層がクロム水酸化物となる二層皮膜の表面処理鋼板であるティンフリースチール(以下TFS)等が好適である。TFSの金属クロム、およびクロム水酸化物層の付着量は特に限定されないが、加工性や耐食性の観点から、金属クロム層は70~200mg/m2、クロム水酸化物層は10~30mg/m2の範囲とすることが望ましい。
本発明の樹脂被覆金属板10において、金属板1の2つの面のうち、樹脂被覆金属板10から缶蓋が成形される際に缶蓋の外面側となる面に熱融着される樹脂フィルム2は、ポリブチレンテレフタレート(PBT)と、ポリエチレンテレフタレート(PET)とを主体とした熱可塑性樹脂フィルムAで構成される。また、缶蓋の内面側となる面に熱融着される樹脂フィルム2は、ポリエチレンテレフタレート(PET)を主体とした熱可塑性樹脂フィルムBで構成される。
(2)ジメチルテレフタレート、エチレングリコール、および共重合成分をエステル交換反応させ、次いで得られる反応生成物を重縮合反応させて共重合ポリエステルとする方法。
ポリエステルの樹脂フィルム2を被覆させた樹脂被覆金属板10を用いて製造された缶体16についてレトルト殺菌処理を行なうと、外面側の樹脂フィルムAが白化する現象が見られる場合がある。これは樹脂フィルムA内に微細な気泡が形成され、これら気泡によって光が散乱した結果、白く濁った外観を呈するものである。加えて、この樹脂フィルムAに形成される気泡は以下のような特徴を有する。まず、これらの気泡は、缶体16を乾熱環境下で加熱しても形成されない。また、缶体16に内容物を充填せずに空き缶のままレトルト殺菌処理を行っても気泡は形成されない。気泡は外面側の樹脂フィルムAの厚み方向全域にわたって観察されるわけではなく、金属板1に接している界面近傍において観察される。以上の特徴から、レトルト殺菌処理に伴う外面側の樹脂フィルムAでの気泡の形成は、以下のメカニズムによって起こると考えられる。
以下、本発明の実施例について説明する。冷間圧延、焼鈍、調質圧延を施した厚さ0.18mm、幅977mmの鋼板を脱脂、酸洗後、クロムめっきを行い、金属板1としてクロムめっき鋼板(TFS)を製造した。クロムめっきは、CrO3、F-、SO4 2-を含むクロムめっき浴でクロムめっきし、中間リンス後、CrO3、F-を含む化成処理液で電解した。その際、電解条件(電流密度・電気量等)を調整して、金属クロム付着量とクロム水酸化物付着量とを、Cr換算でそれぞれ120mg/m2、15mg/m2にした。
(1-1)缶蓋の外面側の樹脂フィルムAのラマンバンド強度比(I90/I0)
ラミネート鋼板10の断面研磨サンプルを作製し、下記測定条件にて、缶蓋11の外面側の樹脂フィルムAの断面方向に対して垂直なレーザー偏光面で、1μm毎に1615±10cm-1のラマンバンド強度を測定し、表層側から5μmの測定値の平均値をラマンバンド強度(I0)とした。また、樹脂フィルムAの断面方向に平行なレーザー偏向面で、表層側から1μm毎に1615±10cm-1のラマンバンド強度を測定し、表層側から5μmの測定値の平均値をラマンバンド強度(I90)とし、上述したラマンバンド強度比(I=I90/I0)を求めた。
ラミネート鋼板10の断面研磨サンプルを作製し、下記測定条件にて、缶蓋11の内面側の樹脂フィルムBの断面方向に平行なレーザー偏向面で、1μm毎に1730±10cm-1のラマンバンドの半値幅を測定し、表層側から5μmの測定値の平均値を求めた。
励起光源:半導体レーザー(λ=532nm)
顕微倍率:×100
アパーチャ:25μmφ
ラミネート鋼板10をプレス装置を用いて、缶蓋形状に打ち抜き、周知の工程で加工して、図2に示す通称200径の缶蓋(底蓋)11を形成した。具体的に、平板状パネル部12の外周部にチャックウォール13が形成され、その外方に湾曲したシーミングパネル14が形成された缶蓋形状とし、シーミングパネル14の内側に周知のシール材15を塗布乾燥した。次いで、1分間に800缶の速度で、缶胴17の端縁フランジ部に缶蓋11を巻き締めた。缶蓋11の巻締部18の(外面側)樹脂フィルムAの状態を観察し、以下の評点に従って耐巻締め性を評価した。
◎:蓋材50枚のうち、フィルム削れの発生無し。
○:蓋材50枚のうち、1~5枚でフィルム削れが発生。
△:蓋材50枚のうち、6~10枚でフィルム削れが発生。
×:蓋材50枚のうち、11枚以上でフィルム削れが発生。
缶蓋11の外面側の樹脂フィルムAの耐レトルト白化性を評価した。具体的には、缶蓋11を缶胴17の底蓋として巻締めた缶体16内に常温の水道水を満たした後、上蓋19を巻き締めて密閉し、図4に示す缶体16を形成した。その後、この缶体16の底部を下向きにして、蒸気式レトルト殺菌炉の中に配置し、125℃で30分間、レトルト処理を行った。レトルト処理後、缶蓋11の外面側の樹脂フィルムAの外観変化を目視で観察し、以下の評点に従って耐レトルト白化性を評価した。
◎:外観変化なし。
○:外観にかすかな曇り(フィルム表面積の5%未満)発生。
△:外観にかすかな曇り(フィルム表面積の5%以上10%未満)発生。
×:外観が白濁(フィルム表面積の10%以上で白化発生)。
ラミネート鋼板10の製缶前の平板サンプル(幅15mm、長さ120mm)を切り出した。切り出されたサンプルの長辺側端部から樹脂フィルム2の一部を剥離する。剥離された樹脂フィルム2を、剥離された方向とは逆方向(角度:180°)に開き、50gの重りを固定して、レトルト処理(125℃、30分間)を行った。レトルト処理後の樹脂フィルム2の剥離長さを測定し、密着性として、成形前フィルム湿潤密着性(2次密着性)を以下の評点に従って評価した。
◎:10mm未満
○:10mm以上、20mm未満
×:20mm以上
上記(2)と同様に缶胴17の底部に缶蓋11の巻き締めを行い、図4に示す形状の缶体16(内容量180ml)を作製した。その後、水道水を充填、缶体16上部に上蓋19を巻き締め密封し、レトルト処理(125℃、30分間)を行った。レトルト処理後に、缶体16が室温になってから、上蓋19を開け、缶体16に電解液(NaCl1%溶液)を、50ml注入し、缶体16と電解液との間に6Vの電圧を付加した。この時に測定される電流値を評価した。以下の評点に従って、耐内容物性として、缶蓋11の内面側の樹脂フィルムBの被覆性を評価した。
◎:0.01mA以下
○:0.01mA超、0.1mA以下
△:0.1mA超、1mA以下
×:1mA超
上述の通りに樹脂被覆金属板10の製造を行い、ラミロール22等への樹脂フィルム2の付着有無を観察し、以下の評点に従って製造性を評価した。
○:フィルム付着無し
×:フィルム付着有り
2 樹脂フィルム
3 レーザー発振器
4 レーザー光
5 ラマン散乱光
6 分光器
7 レンズ
10 樹脂被覆金属板
11 缶蓋
12 平板状パネル部
13 チャックウォール
14 シーミングパネル
15 シール材
16 缶体
17 缶胴
18 巻締部
19 上蓋
21 金属帯加熱装置
22 圧着ロール(ラミロール)
Claims (1)
- 金属板の両面が熱可塑性樹脂フィルムにより被覆されて缶蓋に成形される缶蓋用樹脂被覆金属板であって、
前記金属板の缶蓋の外面側となる面にポリブチレンテレフタレート(PBT)とポリエチレンテレフタレート(PET)とを主体とした熱可塑性樹脂フィルムAが熱融着され、缶蓋の内面側となる面にポリエチレンテレフタレート(PET)を主体とした熱可塑性樹脂フィルムBが熱融着されて構成され、
前記外面側の熱可塑性樹脂フィルムAのPBT/PETの組成比(wt%)が、(PBT/PET)=(40/60)~(80/20)で、前記内面側の熱可塑性樹脂フィルムBがPET95mol%以上であり、
前記内面側の熱可塑性樹脂フィルムBのPET由来の融点が250℃以上265℃以下であり、かつ、前記外面側の熱可塑性樹脂フィルムAにおけるPBT由来の融点より25℃以上高く、
前記外面側の熱可塑性樹脂フィルムAは、レーザーラマン分光法で表面に対し水平である偏光面で測定した1615±10cm-1のラマンバンド強度(I0)と、レーザーラマン分光法で表面に対し垂直である偏光面で測定した1615±10cm-1のラマンバンド強度(I90)とのラマンバンド強度比(I90/I0)が、0.60以上であり、
前記内面側の熱可塑性樹脂フィルムBは、レーザーラマン分光法で表面に対し水平である偏光面で測定した1730±10cm-1のラマンバンドの半値幅が、15~20cm-1であることを特徴とする缶蓋用樹脂被覆金属板。
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018140542A (ja) * | 2017-02-28 | 2018-09-13 | 北海製罐株式会社 | 缶詰用缶蓋 |
JPWO2020017466A1 (ja) * | 2018-07-20 | 2021-08-02 | 大和製罐株式会社 | 缶蓋 |
JP7279045B2 (ja) | 2018-07-20 | 2023-05-22 | 大和製罐株式会社 | 缶蓋 |
Also Published As
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CA2969648A1 (en) | 2016-06-16 |
MY187478A (en) | 2021-09-23 |
US10399303B2 (en) | 2019-09-03 |
EP3231723A1 (en) | 2017-10-18 |
AU2015362532A1 (en) | 2017-06-29 |
CN107000892B (zh) | 2018-12-21 |
EP3231723B1 (en) | 2018-11-28 |
US20170266924A1 (en) | 2017-09-21 |
JPWO2016093219A1 (ja) | 2017-04-27 |
CN107000892A (zh) | 2017-08-01 |
CA2969648C (en) | 2019-06-18 |
AU2015362532B2 (en) | 2018-08-02 |
EP3231723A4 (en) | 2017-12-13 |
PH12017501049A1 (en) | 2017-11-27 |
KR101980985B1 (ko) | 2019-05-21 |
NZ732547A (en) | 2018-06-29 |
KR20170084165A (ko) | 2017-07-19 |
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