JP2003104349A - Seamless aluminum container - Google Patents
Seamless aluminum containerInfo
- Publication number
- JP2003104349A JP2003104349A JP2002259939A JP2002259939A JP2003104349A JP 2003104349 A JP2003104349 A JP 2003104349A JP 2002259939 A JP2002259939 A JP 2002259939A JP 2002259939 A JP2002259939 A JP 2002259939A JP 2003104349 A JP2003104349 A JP 2003104349A
- Authority
- JP
- Japan
- Prior art keywords
- container
- ironing
- value
- thinning
- aluminum
- 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.)
- Granted
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 67
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 48
- 239000000057 synthetic resin Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims description 55
- 239000011248 coating agent Substances 0.000 claims description 53
- 238000000576 coating method Methods 0.000 claims description 53
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 31
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims 1
- 238000010409 ironing Methods 0.000 description 92
- 238000000465 moulding Methods 0.000 description 44
- 239000000463 material Substances 0.000 description 38
- 238000012545 processing Methods 0.000 description 37
- 230000008569 process Effects 0.000 description 36
- 230000003746 surface roughness Effects 0.000 description 29
- 230000037303 wrinkles Effects 0.000 description 25
- 238000004519 manufacturing process Methods 0.000 description 23
- 230000007797 corrosion Effects 0.000 description 18
- 238000005260 corrosion Methods 0.000 description 18
- 238000005461 lubrication Methods 0.000 description 18
- 229910000838 Al alloy Inorganic materials 0.000 description 16
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- -1 and specifically Polymers 0.000 description 13
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 238000007639 printing Methods 0.000 description 12
- 238000005452 bending Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 11
- 239000000049 pigment Substances 0.000 description 11
- 229920002799 BoPET Polymers 0.000 description 10
- 230000009467 reduction Effects 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- 230000009477 glass transition Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000004804 winding Methods 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 239000002932 luster Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 206010013786 Dry skin Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 235000019271 petrolatum Nutrition 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 230000002087 whitening effect Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 2
- 241000234282 Allium Species 0.000 description 2
- 235000002732 Allium cepa var. cepa Nutrition 0.000 description 2
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 2
- 229920000571 Nylon 11 Polymers 0.000 description 2
- 229920000299 Nylon 12 Polymers 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 235000019482 Palm oil Nutrition 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007739 conversion coating Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000000976 ink Substances 0.000 description 2
- 239000001023 inorganic pigment Substances 0.000 description 2
- 229920000554 ionomer Polymers 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002540 palm oil Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 235000019809 paraffin wax Nutrition 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 230000009044 synergistic interaction Effects 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 239000003871 white petrolatum Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、パール顔料を施し
たような明るい外観を有する合成樹脂で被覆した２ピー
スシームレスアルミニウム缶とその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-piece seamless aluminum can coated with a synthetic resin having a bright appearance like a pearl pigment and a method for producing the same.
【０００２】[0002]
【従来の技術】従来のアルミニウム板を用いた２ピース
シームレスアルミニウム容器は絞り工程を２回行った
後、しごき工程を３回ウエット潤滑で行って胴壁部、胴
上部の平均薄肉化率約６２％の容器とした。このような
方法では洗浄工程が必要となり廃水処理、スラッジの発
生等の問題があり、後工程で内面に塗料を塗装する必要
があった。得られる容器は金属光沢はあるが、明度が暗
く、彩度が濃いため印刷下地には適していない。合成樹
脂を被覆したアルミニウム板を用いて上記の従来方法で
成形すると被覆樹脂層が損傷し接着界面にかかる歪が増
加するため接着力が低下する欠点が生ずる。2. Description of the Related Art A conventional two-piece seamless aluminum container using an aluminum plate is subjected to a drawing process twice and an ironing process three times with wet lubrication to obtain an average thinning ratio of about 62 on the body wall and the upper part of the body. % Container. In such a method, a washing step is required and there are problems such as wastewater treatment and sludge generation, and it is necessary to apply a paint to the inner surface in a later step. The resulting container has a metallic luster, but it is not suitable as a printing substrate because it has a dark brightness and a deep saturation. When the aluminum plate coated with a synthetic resin is molded by the above-mentioned conventional method, the coating resin layer is damaged and the strain applied to the adhesive interface is increased, so that the adhesive strength is lowered.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、内面の合成
樹脂被覆とアルミニウム表面の接着性を改善し、ネック
フランジ、巻締等の加工性を向上させるとともに外面を
パール顔料を施したような明度が明るく彩度の薄い、容
器を提供するものである。DISCLOSURE OF THE INVENTION The present invention improves the adhesion between the synthetic resin coating on the inner surface and the aluminum surface, improves the workability such as neck flange and winding, and at the same time applies the pearl pigment on the outer surface. It provides a container with lightness and light saturation.
【０００４】[0004]
【課題を解決するための手段】本発明は、
「１． 合成樹脂被覆したアルミニウム板を用いて形成
した２ピースシームレス容器において、容器の外面がＬ
＊ ａ＊ ｂ＊ 表色系色度で表わして、明度Ｌ＊
値がＬ＊ ＞６０であり、色度のａ＊値およびｂ＊
値から次式を用いて計算される彩度ｃ＊ が
ｃ＊ ＝（ａ＊２＋ｂ＊２）１／２ ＜５
の関係を満した２ピースシームレスアルミニウム容器。
２． 合成樹脂被覆したアルミニウム板を用いて形成し
た２ピースシームレス容器において、容器内面が、底
部の表面粗さＲａ（Ｂ）がＲａ（Ｂ）≦０．５μｍであ
り、胴壁部の表面粗さＲａ（Ｗ）と胴上部の表面粗さ
Ｒａ（Ｆ）がＲａ（Ｗ）＜Ｒａ（Ｆ）であり、表面粗
さのパターンを示す係数（Ｒｚ／Ｒａ）について底部
（Ｂ）と上部（Ｆ）との間に（Ｒｚ／Ｒａ）（Ｆ）≧
（Ｒｚ／Ｒａ）（Ｂ）の関係を満していることを特徴と
する、合成樹脂を被覆した２ピースシームレスアルミニ
ウム容器。
３． 合成樹脂を被覆したアルミニウム板を用いて形成
した、容器の外面がＬ＊ａ＊ ｂ＊ 表色系色度で表わ
して、明度Ｌ＊ 値がＬ＊ ＞６０であり、色度の
ａ＊ 値およびｂ＊ 値から次式を用いて計算される彩
度ｃ＊ が
ｃ＊ ＝（ａ＊２＋ｂ＊２）１／２ ＜５
の関係を満す２ピースシームレス容器において、容器内
面が、底部の表面粗さＲａ（Ｂ）がＲａ（Ｂ）≦０．
５μｍであり、胴壁部の表面粗さＲａ（Ｗ）と胴上部
の表面粗さＲａ（Ｆ）がＲａ（Ｗ）＜Ｒａ（Ｆ）であ
り、表面粗さのパターンを示す係数（Ｒｚ／Ｒａ）に
ついて底部（Ｂ）と上部（Ｆ）との間に（Ｒｚ／Ｒａ）
（Ｆ）≧（Ｒｚ／Ｒａ）（Ｂ）の関係を満していること
を特徴とする、合成樹脂を被覆した２ピースシームレス
アルミニウム容器。
４． アルミニウム板を被覆する合成樹脂が熱可塑性樹
脂である、１項ないし３項のいずれか１項に記載された
２ピースシームレスアルミニウム容器。
５． 容器外面の明度と彩度の値が容器胴部外面の高さ
方向中央部で金属面を測定して得た値である、１項また
は３項に記載された２ピースシームレスアルミニウム容
器。
６． Ｌ＊ 値、ａ＊ 値、ｂ＊ 値が、正反射光除去
方式により測定した反射率からＤ６５光源および２°視
野の条件により算出した値である、１項または３項ない
し５項のいずれか１項に記載された、２ピースシームレ
スアルミニウム容器。
７． 容器内面の表面粗さが、各部位の金属面を圧延目
に対して直角方向で測定した値である、２項または３項
に記載された２ピースシームレスアルミニウム容器。
８． 表面粗さのパターンを示す係数Ｒｚ／Ｒａが基準
面よりの凹部５点の距離の平均値と凸部の５点の距離の
平均値の合計から求められる十点平均粗さＲｚと、基準
面からの凹部と凸部の面積から求められる中心線平均粗
さＲａの比である、２項または３項に記載された２ピー
スシームレスアルミニウム容器。
９． 最終容器側壁部の平均の薄肉化率が２０〜７０％
である、１項ないし８項のいずれか１項に記載された２
ピースシームレスアルミニウム容器。
１０． 両面を合成樹脂で被覆されたアルミニウム板を
しわ押え具で押えつつドライ潤滑によりポンチを前進さ
せて絞り加工コーナーで絞り加工を行うとともに、さら
にポンチを前進させて該加工コーナーの前端部に接続す
るしごき部と協働してしごき加工を行って、側壁部の板
厚が元板厚よりも薄い前工程カップを絞り加工としごき
加工を同時に行う同時絞りしごき加工で形成する第一工
程と、そのカップの底部の周縁部をしわ押え具で押えつ
つ、ドライ潤滑により再絞りポンチを前進させて、カッ
プの側面部をダイスの曲率半径の小さい絞り加工コーナ
ーに密接させて、再絞り加工を行いカップを縮径すると
ともに、ダイス絞り加工コーナー部で曲げ延伸を行って
側壁の板厚を減少し、さらにポンチを前進させて、該加
工コーナーの前端部に接続するしごき部と協働して絞り
加工を行って、側壁部の板厚を減少させて均一厚とする
同時薄肉化絞りしごき加工による再絞り工程を少なくと
も１回工程行うことを特徴とする２ピースシームレスア
ルミニウム容器の製造方法。
１１． 再絞り工程におけるダイス絞り加工コーナーの
大きさＲｄが元板厚さt０との比で表わして
１．０＜Ｒｄ／ｔ０ ＜２．９
の範囲である、請求項１０に記載された２ピースシーム
レスアルミニウム容器の製造方法。
１２． 一工程での薄肉化率が３〜５０％であって、そ
のうちの再絞りしごき工程でのしごきによる薄肉化が２
〜３０％である、１０項または１１項に記載された２ピ
ースシームレスアルミニウム容器の製造方法。
１３． 一工程での薄肉化率が５〜３５％であって、そ
のうちの再絞りしごき工程でのしごきによる薄肉化が２
〜３０％である、１０項ないし１２項のいずれか１項に
記載された２ピースシームレスアルミニウム容器の製造
方法。
１４． ダイスの合成樹脂被覆材と接触する部分の表面
温度、しわ押え具の合成樹脂被覆材と接触する部分の表
面温度、ポンチの表面温度を合成樹脂被膜のガラス転移
温度＋５０℃〜ガラス転移温度＋１０℃で絞りしごき加
工を行う、１０項ないし１３項のいずれか１項に記載さ
れた２ピースシームレスアルミニウム容器の製造方
法。」に関する。The present invention provides a "1. In a two-piece seamless container formed by using a synthetic resin-coated aluminum plate, the outer surface of the container is L-shaped.
* A * b * Lightness L *
Value is L * > 60, and chromaticity a * value and b *
A two-piece seamless aluminum container in which the saturation c * calculated from the values is c * = (a * 2 + b * 2 ) 1/2 <5. 2. In a two-piece seamless container formed by using an aluminum plate coated with a synthetic resin, the inner surface of the container has a bottom surface roughness Ra (B) of Ra (B) ≦ 0.5 μm and a surface roughness Ra of the body wall portion. (W) and the surface roughness Ra (F) of the upper part of the body are Ra (W) <Ra (F), and the coefficient (Rz / Ra) indicating the pattern of the surface roughness is the bottom (B) and the top (F). Between (Rz / Ra) (F) ≧
A two-piece seamless aluminum container coated with a synthetic resin, which satisfies the relationship of (Rz / Ra) (B). 3. The outer surface of the container, which is formed by using an aluminum plate coated with a synthetic resin, is represented by L * a * b * color system chromaticity, and the lightness L * value is L * > 60, and the a * value of chromaticity is In a two-piece seamless container in which the saturation c * calculated from the b * value and the b * value satisfies the relationship of c * = (a * 2 + b * 2 ) 1/2 <5, the inner surface of the container has a bottom portion. Surface roughness Ra (B) of Ra (B) ≦ 0.
5 μm, the surface roughness Ra (W) of the body wall and the surface roughness Ra (F) of the upper body are Ra (W) <Ra (F), and a coefficient (Rz / About Ra) (Rz / Ra) between bottom (B) and top (F)
A two-piece seamless aluminum container coated with a synthetic resin, which satisfies the relationship of (F) ≧ (Rz / Ra) (B). 4. The two-piece seamless aluminum container according to any one of items 1 to 3, wherein the synthetic resin coating the aluminum plate is a thermoplastic resin. 5. The two-piece seamless aluminum container according to item 1 or 3, wherein the values of lightness and saturation on the outer surface of the container are values obtained by measuring a metal surface at the center in the height direction of the outer surface of the container body. 6. The L * value, the a * value, and the b * value are values calculated from the reflectance measured by the specular reflection light removal method under the conditions of the D65 light source and the 2 ° field of view, 1 or 3 or 5. The two-piece seamless aluminum container described in item 1. 7. The two-piece seamless aluminum container according to item 2 or 3, wherein the surface roughness of the inner surface of the container is a value obtained by measuring the metal surface of each part in a direction perpendicular to the rolled eye. 8. The coefficient Rz / Ra indicating the pattern of the surface roughness is a ten-point average roughness Rz obtained from the sum of the average value of the distances of five concave portions from the reference surface and the average value of the distances of five convex portions, and the reference surface. The two-piece seamless aluminum container described in item 2 or item 3, which is the ratio of the centerline average roughness Ra obtained from the areas of the concave portions and the convex portions in FIG. 9. Average thinning rate of the side wall of the final container is 20-70%
2 which is described in any one of 1 to 8
Peace seamless aluminum container. 10. While pressing the aluminum plate coated with synthetic resin on both sides with the wrinkle retainer, the punch is advanced by dry lubrication to draw at the drawing corner, and the punch is further advanced to connect to the front end of the processing corner. Performing ironing in cooperation with the ironing part, the first step of forming by the simultaneous drawing and ironing process in which the pre-process cup in which the plate thickness of the side wall part is thinner than the original plate thickness is simultaneously drawn and ironed While pressing the peripheral edge of the bottom of the cup with the wrinkle retainer, advance the redraw punch by dry lubrication to bring the side surface of the cup into close contact with the drawing corner with a small radius of curvature of the die and perform redraw processing. The diameter of the die is reduced and the thickness of the side wall is reduced by bending and stretching at the corner of the die drawing process, and the punch is further advanced to connect to the front end of the processing corner. 2 piece characterized by performing redrawing step by drawing at the same time by performing drawing processing in cooperation with the ironing part to reduce the plate thickness of the side wall portion to a uniform thickness Seamless aluminum container manufacturing method. 11. The size Rd of the die drawing corner in the redrawing step is in the range of 1.0 <Rd / t 0 <2.9 expressed as a ratio with the original plate thickness t 0. Method for manufacturing piece seamless aluminum container. 12. The thinning rate in one process is 3 to 50%, of which the thinning due to ironing in the redrawing and ironing process is 2
The manufacturing method of the 2 piece seamless aluminum container as described in 10 or 11 which is -30%. 13. The thinning rate in one step is 5 to 35%, of which the thinning due to ironing in the redrawing and ironing step is 2
The method for producing a two-piece seamless aluminum container according to any one of items 10 to 12, which is -30%. 14. The surface temperature of the portion of the die that contacts the synthetic resin coating material, the surface temperature of the portion of the wrinkle retainer that contacts the synthetic resin coating material, and the punch surface temperature are the glass transition temperature of the synthetic resin coating + 50 ° C to the glass transition temperature + 10 ° C. The method for producing a two-piece seamless aluminum container according to any one of items 10 to 13, wherein the ironing process is performed by drawing. Regarding
【０００５】本発明における明度と彩度はＬ＊ ａ＊
ｂ＊ 表色系色度で表わした値である。通常アスタリス
（＊）ついていないＬａｂはハンターのＬａｂ表色系を
意味する。色は色相、明度、彩度の三属性によりなる
が、明度は明るさの度合を表わし、彩度はあざやかさの
度合を表わす。同じ色相であっても明度と彩度が異なれ
ば色感は異なる。図１により説明すると、Ｌ＊．
ａ＊．ｂ＊．は表示単位であって、明度はＬ＊ 、色相
と彩度を表わす色度はａ＊ ．ｂ＊ ．で示される。ａ
＊．ｂ＊．は夫々色の方向を示し、ａ＊．は赤−緑方向
を示し、ｂ＊ は黄−青方向を示す。図２はＬ＊． ａ
＊．ｂ＊．表色系色度図であって、ａ＊ 値とｂ＊ 値
が交差する点が色度となる。彩度ｃ＊ はｃ＊ ＝（ａ
＊２＋ｂ＊２）１／２ の式で求められる。明度が大き
いと明るくなり、彩度が小さいとあざやかさが小さくな
る。したがって印刷の下地としては明度が大きく彩度の
小さいことが好ましい。色度ａ＊ 値とｂ＊ 値は例え
ばＭＩＮＯＬＴＡ株式会社製ＣＭ−３７００ｄ（色彩管
理ソフトウエアーＣＭ−Ｓ３Ｗ）の分光測色計で測定し
て処理した値である。The lightness and saturation in the present invention are L * a *.
b * A value expressed in chromaticity of color system. Usually, a Lab without an asterisk (*) means the Lab color system of Hunter. A color has three attributes of hue, lightness, and saturation. Lightness represents the degree of brightness, and saturation represents the degree of vividness. Even if the hue is the same, if the lightness and the saturation are different, the color feeling is different. Referring to FIG. 1, L * .
a * . b * . Is a display unit, lightness is L *, and chromaticity representing hue and saturation is a *. b *. Indicated by. a
* . b * . Indicates the color direction, and a * . Indicates the red-green direction, and b * indicates the yellow-blue direction. FIG. 2 shows L * . a
* . b * . In the colorimetric chromaticity diagram, the chromaticity is the point where the a * value and the b * value intersect. The saturation c * is c * = (a
* 2 + b * 2 ) 1/2 is calculated . The higher the lightness, the brighter the image becomes, and the less the saturation, the less bright the image becomes. Therefore, it is preferable that the base of printing has a large lightness and a small saturation. The chromaticity a * value and the b * value are values measured and processed by a spectrocolorimeter of CM-3700d (color management software CM-S3W) manufactured by MINOLTA CORPORATION.
【０００６】容器外面の明度Ｌ＊ 値がＬ＊ ＞６０で
あり、彩度ｃ＊ 値がｃ＊ ＜５であるとパール顔料を
施したような乳白色面となり、容器に印刷する場合白色
の下塗りをしなくても色の表現に優れているため直接印
刷することができる効果がある。内面は、内容物と接す
るため、経時的耐腐食特性が要求される。このために
は、被覆している樹脂自身の特性も重要だがアルミ板材
と被覆する合成樹脂被覆の接着性の大きいことも、もっ
と必要である。一般に金属基材と合成樹脂被覆との接着
力は、容器の成形加工や、ネックフランジ加工、巻締加
工等に伴い低下する傾向にあり、その値は、初期接着力
や加工歪の程度、加工後の熱処理の有無、基材表面の粗
さと密接な関係がある。When the lightness L * value of the outer surface of the container is L * > 60 and the saturation c * value is c * <5, the surface becomes a milky white surface like a pearl pigment, and when printing on a container, a white undercoat is used. It is possible to print directly because it is excellent in color expression without performing. Since the inner surface is in contact with the content, corrosion resistance over time is required. For this purpose, the characteristics of the coating resin itself are important, but the adhesiveness between the aluminum plate and the synthetic resin coating to be coated is also more important. Generally, the adhesive force between the metal base material and the synthetic resin coating tends to decrease with the forming process of the container, the neck flange process, the winding process, etc., and the value is the initial adhesive force, the degree of process strain, the process It has a close relationship with the presence or absence of subsequent heat treatment and the roughness of the substrate surface.
【０００７】容器内面のアルミニウム面の表面粗さの測
定は、底部、胴部、とも圧延による条痕に対し直角の方
向に行い、胴部はその方向が容器の高さ方向となる位置
（９０°）で測定した。（図参照）測定条件はカットオ
フ０．８mm、測定長さ２mm、各点とも５回測定して平均
する。The surface roughness of the aluminum surface of the inner surface of the container is measured in the direction perpendicular to the streaks caused by rolling, both the bottom and the body, and the body is located at a position where the direction is the height direction of the container (90). °). (Refer to the figure) The measurement conditions are a cutoff of 0.8 mm, a measurement length of 2 mm, and each point is measured 5 times and averaged.
【０００８】側壁部および上部の表面の粗さの絶対値は
原板（底部）の粗さＲａ（Ｂ）の影響を受ける。底部の
表面粗さＲａ（Ｂ）が０．５以上であると薄肉化の際に
側壁部および上部の肌粗れが大きくなり、それを起点と
した破胴が生じるのでＲａ（Ｂ）≦０．５である必要が
ある。胴壁部および上部の表面粗さＲａ（Ｗ）、Ｒａ
（Ｆ）については、一般に、絞り容器の表面粗さは加工
によるひずみが大きくなる上方ほど大きくなる。一方
で、しごきを加えると、絞りによる厚肉化が大きい上方
ほどしごきの率が高くなり平滑化する。上部（Ｆ）と胴
壁部（Ｗ）とで板厚減少率に差を付けた場合には、しご
きが強い胴壁部のほうが上部よりＲａが小さくなる。上
部はネッククランジ加工のため厚く残す必要から、しご
き率小としており、壁部は軽量化のためより薄くする必
要がありしごき率が高くなっている。The absolute values of the surface roughness of the side wall and the top are influenced by the roughness Ra (B) of the original plate (bottom). If the surface roughness Ra (B) of the bottom is 0.5 or more, the surface roughness of the side wall and the upper part becomes large when the wall thickness is reduced, and a breakage occurs from that point, so Ra (B) ≦ 0. Must be .5. Surface roughness Ra (W), Ra of the body wall and upper part
Regarding (F), generally, the surface roughness of the squeezed container increases as the strain due to processing increases. On the other hand, when ironing is added, the ironing rate becomes higher and smoothing becomes higher as the thickness increases due to drawing. When the plate thickness reduction rate is made different between the upper portion (F) and the body wall portion (W), Ra is smaller in the body wall portion where ironing is stronger than in the upper portion. Since the upper part needs to be left thick for neck clunging, the ironing rate is small, and the wall part needs to be thinner to reduce the weight, and the ironing rate is high.
【０００９】次に本発明における表面粗さを表わすＲ
ａ、Ｒｚについて説明する。表面粗さはＪＩＳ規格によ
ると次の中心線平均粗さ（Ｒａ）、最大高さ（Ｒｍａ
ｘ）および十点平均粗さ（Ｒｚ）の三つが規定されてい
る。
ｉ） 中心線平均粗さ Ｒａ
これは、粗さ曲線からその中心線の方向に測定長さｌの
部分を抜き取り、この抜き取り部分の中心線をｘ軸、縦
倍率の方向をｙ軸とし、粗さ曲線をｙ＝ｆ（ｘ）で表わ
したとき、次の式によって求められる値をマイクロメー
トル（μｍ）で表わしたものである。Next, R representing the surface roughness in the present invention
a and Rz will be described. According to JIS standard, the surface roughness is the following center line average roughness (Ra) and maximum height (Rma).
x) and ten-point average roughness (Rz) are defined. i) Centerline average roughness Ra This is a method of extracting a portion of the measurement length l from the roughness curve in the direction of the centerline, and defining the centerline of the extracted portion as the x-axis and the vertical magnification direction as the y-axis. When the height curve is represented by y = f (x), the value obtained by the following equation is represented by micrometers (μm).
【００１０】[0010]
【数１】 [Equation 1]
【００１１】ii） 最大高さ Ｒｍａｘ
これは、断面曲線から基準長さだけ抜き取った部分の平
行線に平行な２直線で抜き取り部分を挾んだとき、この
２直線の間隔を断面曲線の縦倍率の方向に測定してこの
値をマイクロメートル（μｍ）で表わしたものである。
iii) 十点平均粗さ Ｒｚ
これは、断面曲線から基準長さだけ抜き取った部分にお
いて、平均線に平行、かつ、断面曲線を横切らない直線
から縦倍率の方向に測定した最高から５番目までの山頂
の標高の平均値と最深から５番目までの谷底の標高の平
均値との差の値をマイクロメートル（μｍ）で表わした
ものである。本発明はこれ等の表面粗さの表示のうち、
中心線平均粗さＲａと十点粗さＲｚを用いて表面粗さの
パターンの特徴を規定する。Ii) Maximum height Rmax This is the vertical magnification of the cross-section curve when the extracted part is sandwiched by two straight lines parallel to the parallel lines of the part extracted by the reference length from the cross-section curve. Is measured in the direction of and the value is expressed in micrometers (μm). iii) Ten-point average roughness Rz This is measured from the straight line that does not cross the cross-section curve and in the longitudinal magnification direction from the highest to the fifth from the straight line that does not cross the cross-section curve in the part where the reference length is extracted from the cross-section curve. The value of the difference between the average value of the altitudes of the mountain peaks and the average values of the altitudes of the valley bottoms from the deepest to the fifth is expressed in micrometers (μm). The present invention, among these indications of surface roughness,
The centerline average roughness Ra and the ten-point roughness Rz are used to define the characteristics of the surface roughness pattern.
【００１２】Ｒｚ／Ｒａは値が小さいと粗さが均一の状
態を意味し、大きいと山谷の大きいヶ所があり接着して
おいて投錨効果がある状態の意味を有する。表面粗さの
パターンを示す係数Ｒｚ／Ｒａについては、粗さ曲線が
ある相似形のパターンにあるときの｛Ｒｚ／Ｒａ｝はＲ
ａによらず一定となり、また、均一であるほど小さい。
しごきによって原板（底部）のパターンのまま薄肉化を
達成した場合は、変化しないか小さくなる。Ｒａ（粗さ
曲線の山谷の面積の合計を基準長さで割った値）が同じ
で、かつ、｛Ｒｚ／Ｒａ｝が大きい値を示すパターンの
場合、この粗さ曲線には、接着に対し‘くさび効果’を
示すと考えられる大きな山谷部と同じＲａでありなが
ら、｛Ｒｚ／Ｒａ｝が小さい値を示すパターンのものよ
り、より平滑な他の部分とを含む。こうしたパターン
は、複数回の絞り（薄肉化深絞り）としごきとの同時加
工を受け、特にダイ肩半径部での薄肉化を伴う場合に現
れると考えられる。A small value of Rz / Ra means a state where the roughness is uniform, and a large value means a state where there are large peaks and valleys and there is an anchoring effect after bonding. Regarding the coefficient Rz / Ra indicating the surface roughness pattern, {Rz / Ra} is R when the roughness curve has a similar pattern.
It becomes constant irrespective of a, and the smaller it is, the smaller it is.
When thinning is achieved with the pattern of the original plate (bottom part) by ironing, it does not change or becomes small. In the case of a pattern in which Ra (a value obtained by dividing the total area of peaks and valleys of the roughness curve divided by the reference length) is the same and {Rz / Ra} is large, the roughness curve shows Although it has the same Ra as the large peaks and valleys that are considered to exhibit the “wedge effect”, it includes other parts that are smoother than those of the pattern in which {Rz / Ra} shows a small value. It is considered that such a pattern appears when a plurality of times of drawing (thinning deep drawing) and ironing are simultaneously performed, and particularly thinning is performed in the die shoulder radius portion.
【００１３】本発明における表面の粗さを示すＲａは表
面の粗さ曲線の山谷の面積の合計を測定長さで割った値
であり、Ｒｚは粗さ曲線の５点の山谷の高さと深さ差の
値の合計である。内面の金属表面の粗さを本発明の範囲
とすることにより、絞りしごき加工後の後熱処理による
被膜接着力の回復効果を高め、さらにネックフランジ・
巻締等の２次加工の際の基材と被膜との界面に働くせん
断力を山谷部が支えることで、接着力の低下割合を抑制
できていると考えられる。その結果得られた最終容器
は、特に耐内容物性に優れる。Ra indicating the surface roughness in the present invention is a value obtained by dividing the total area of the peaks and valleys of the surface roughness curve by the measurement length, and Rz is the height and depth of the five peaks and valleys of the roughness curve. It is the sum of the difference values. By adjusting the roughness of the inner metal surface within the range of the present invention, the recovery effect of the coating adhesive force by the post heat treatment after drawing and ironing is enhanced, and the neck flange
It is considered that the peaks and troughs support the shearing force acting on the interface between the base material and the coating film during the secondary processing such as winding, so that the rate of decrease in the adhesive force can be suppressed. The final container obtained as a result is particularly excellent in content resistance.
【００１４】アルミニウム板に被覆する合成樹脂被覆と
しては熱可塑性樹脂でなければならないが、具体的に
は、ポリエチレン、ポリプロピレン、エチレン−プロピ
レン共重合体、エチレン−酢酸ビニル共重合体、エチレ
ン−アクリルエステル共重合体、アイオノマー等のオレ
フィン系樹脂フイルム；ポリエチレンテレフタレート、
ポリブチレンテレフタレート、エチレンテレフタレート
／イソフタレート共重合体等のポリエステル；ナイロン
６、ナイロン６，６、ナイロン１１、ナイロン１２等の
ポリアミド；ポリ塩化ビニル；ポリ塩化ビニリデン等を
挙げることができる。また、外観上の観点から、上記樹
脂に無機顔料を含有することもできる。上記樹脂で被覆
される原板は、缶成形後あるいはバルジ成形後の密着性
及び耐食性をより良好な状態に維持するために、表面に
化成処理層を有することが望ましい。化成処理皮膜とし
ては、加工性の他に、耐水性あるいは耐食性を有するこ
とが特に重要であり、例えば、従来より塗装下地用の化
成処理として利用されているりん酸クロメート、あるい
は、ジルコニウムやチタンの酸化物を主成分とする化成
皮膜、あるいはポリアクリル酸−ジルコニウム塩の複合
皮膜等がある。皮膜量としては、金属分としてＴｉ、Ｃ
ｒ、Ｚｒを含む場合には当該金属量で、５〜３００mg／
ｍ２ 程度が好ましい。被覆は、溶融させた樹脂の押出
しコートであっても、製膜後にフイルムとして熱接着を
行ったものでも良い。The synthetic resin coating on the aluminum plate must be a thermoplastic resin, and specifically, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic ester. Olefin resin films such as copolymers and ionomers; polyethylene terephthalate,
Examples thereof include polyesters such as polybutylene terephthalate and ethylene terephthalate / isophthalate copolymers; polyamides such as nylon 6, nylon 6,6, nylon 11 and nylon 12; polyvinyl chloride; polyvinylidene chloride. Further, from the viewpoint of appearance, the resin may contain an inorganic pigment. The original plate coated with the above resin preferably has a chemical conversion treatment layer on its surface in order to maintain the adhesiveness and corrosion resistance after can forming or bulge forming in a better state. As the chemical conversion coating, it is particularly important to have water resistance or corrosion resistance in addition to workability. For example, chromate phosphate, which has been conventionally used as a chemical conversion treatment for a coating base, or zirconium or titanium. There are a chemical conversion film containing an oxide as a main component, a composite film of polyacrylic acid-zirconium salt, and the like. The coating amount is Ti, C as the metal content.
When r and Zr are included, the amount of the metal is 5 to 300 mg /
It is preferably about m 2 . The coating may be an extrusion coating of melted resin or a film which has been thermally adhered as a film after film formation.
【００１５】本発明の２ピースシームレスアルミニウム
容器は、両面を合成樹脂で被覆されたアルミニウム板を
しわ押え具で押えつつドライ潤滑によりポンチを前進さ
せて絞り加工コーナーで絞り加工を行うとともに、さら
にポンチを前進させて該加工コーナーの前端部に接続す
るしごき部と協働してしごき加工を行って、側壁部の板
厚が元板厚よりも薄い前工程カップを絞り加工としごき
加工を同時に行う同時絞りしごき加工で形成する第一工
程と、そのカップの底部の周縁部をしわ押え具で押えつ
つ、ドライ潤滑により再絞りポンチを前進させて、カッ
プの側面部をダイスの曲率半径の小さい絞り加工コーナ
ーに密接させて、再絞り加工を行いカップを縮径すると
ともに、ダイス絞り加工コーナー部で曲げ延伸を行って
側壁の板厚を減少し、さらにポンチを前進させて、該加
工コーナーの前端部に接続するしごき部と協働して絞り
加工を行って、側壁部の板厚を減少させて均一厚とする
同時薄肉化絞りしごき加工による再絞り工程を少なくと
も１回工程行うことにより製造することができる。In the two-piece seamless aluminum container of the present invention, the punch is advanced by dry lubrication while pressing the aluminum plate whose both sides are coated with the synthetic resin with the wrinkle retainer to perform the drawing at the drawing corner, and further the punch. To perform the ironing work in cooperation with the ironing part connected to the front end of the processing corner, and perform the ironing at the same time by drawing the pre-process cup whose side wall thickness is thinner than the original plate thickness. Simultaneous drawing The first step of forming by ironing and pressing the peripheral edge of the bottom of the cup with a wrinkle presser, while advancing the redrawing punch by dry lubrication, the side of the cup is drawn with a small radius of curvature of the die. The cup thickness is reduced by bringing it closer to the processing corner to reduce the diameter of the cup, and the side wall thickness is reduced by bending and stretching at the corner of the die drawing processing. , Further advance the punch, and perform the drawing process in cooperation with the ironing part connected to the front end part of the processing corner to reduce the plate thickness of the side wall part to a uniform thickness. It can be manufactured by performing the redrawing step at least once.
【００１６】再絞り工程におけるダイス絞り加工コーナ
ーの大きさＲｄが元板厚さｔ０ との比で表わして
１．０＜Ｒｄ／ｔ０ ＜２．９
の範囲であると、再絞り加工中の材料が加工コーナー部
を通過する際に薄肉化を生じて容器全体としての薄肉化
度確保に寄与すると同時に、望ましい内面の表面粗さが
発現するという利点がある。During the redrawing process, if the size Rd of the die drawing corner in the redrawing process is in the range of 1.0 <Rd / t 0 <2.9 as a ratio to the original plate thickness t 0. There is an advantage that the material of (1) is thinned when passing through the processed corner portion and contributes to secure the degree of thinning of the entire container, and at the same time, the desired inner surface roughness is exhibited.
【００１７】一工程での薄肉化率が３〜５０％であっ
て、そのうちの再絞りしごき工程でのしごきによる薄肉
化が２〜３０％であることが好ましいが一工程での薄肉
化率が５〜３５％の範囲が最も好ましい。このような同
時絞りしごき加工及び同時薄肉化絞りしごき加工を複数
回行うことにより側壁部の薄肉化の破断限界が向上し、
薄肉の側壁部を形成することができ、さらに外面の明度
と彩度を調節し、内面の表面粗さを調節することができ
る。It is preferable that the thinning rate in one step is 3 to 50%, and the thinning rate due to ironing in the redrawing and ironing step is 2 to 30%, but the thinning rate in one step is The range of 5 to 35% is the most preferable. By performing such simultaneous drawing and ironing and simultaneous thinning and ironing multiple times, the fracture limit for thinning the side wall is improved,
A thin side wall portion can be formed, and further, the brightness and saturation of the outer surface can be adjusted, and the surface roughness of the inner surface can be adjusted.
【００１８】絞り加工において、ダイスの加工コーナー
の曲率半径が小さいので、加工コーナーでの曲げ延伸に
よって、金属カップの側壁部が薄肉化される。加工コー
ナーでの曲げ延伸後しごき加工を受けるが、曲げ延伸の
際に加わる力が側壁部の高さ方向であるのに対して、し
ごき加工の場合は板厚方向である。このように１ストロ
ークで絞りとしごきを行うことにより、絞り加工のバッ
クテンションをかけながらしごくことにより被覆の破壊
防ぐことができる。一般にしごき加工により破断限界は
向上するが、力の加わる方向が異なる曲げ延伸加工にし
ごき加工を加えることにより、さらに両者の相乗的な力
の相互作用から、大幅な薄肉化を実現することができ
る。従って比較的細長い、好ましくは高さ／直径の比が
１以上のシームレス缶を製造できる。またしごき加工の
際、側壁部は、ポンチとしごき部間の間隙部を通過して
しごかれて、間隙部の間隙幅に実質的に等しい厚さに薄
肉化されるので、しごき中の高さ方向の間隙幅を制御す
ることにより、側壁部の高さ方向肉厚を制御できる。ま
た間隙幅を周方向に一定にすることにより、側壁部の周
方向の厚さの均一化を実現できる。In the drawing process, since the radius of curvature of the working corner of the die is small, the side wall portion of the metal cup is thinned by bending and stretching at the working corner. Although ironing is performed after bending and stretching at the processing corner, the force applied during bending and stretching is in the height direction of the side wall, whereas in the case of ironing, it is in the plate thickness direction. By performing the drawing and ironing with one stroke in this way, it is possible to prevent the coating from being broken by ironing while applying the back tension for drawing. Generally, the breaking limit is improved by ironing, but by bending and stretching in which the force application direction is different and ironing is performed, it is possible to achieve a significant reduction in wall thickness due to the synergistic interaction between the two. . It is therefore possible to produce relatively cans, preferably seamless cans with a height / diameter ratio of 1 or more. Also, during ironing, the side wall portion is squeezed through the gap between the punch and the ironing portion and is thinned to a thickness substantially equal to the gap width of the gap portion. By controlling the gap width in the depth direction, the thickness in the height direction of the side wall portion can be controlled. Further, by making the gap width constant in the circumferential direction, it is possible to realize uniform circumferential thickness of the side wall portion.
【００１９】合成樹脂被膜は、再絞り加工により高さ方
向への一軸延伸により薄肉化されるが、しごき加工の際
に、厚さ方向の面圧力を受けながら薄肉化されるため、
再絞り加工のみの場合とは異なり、側壁部の厚さ分布が
均一になる。開口端部となるべき側壁部に少なくとも５
％の板厚減少率のしごき加工が加えられるので、開口端
部がネックイン加工やフランジ加工される際の局所的な
不均一変形が押さえられるためと考えられるが、ネック
イン部に有機被膜の白化等の劣化が起こり難くなる。ま
た有機被膜はしごき加工により平滑化するので、印刷適
性が向上する。また、本願によれば、特開平７−２７５
９６１では、利用が困難だった高異方性材、高強度材の
加工による肌粗れを生じやすい材料等でも容易に成形す
ることができる。The synthetic resin coating is thinned by uniaxial stretching in the height direction by redrawing, but it is thinned while receiving surface pressure in the thickness direction during ironing.
Unlike the case of only redrawing, the thickness distribution of the side wall becomes uniform. At least 5 on the side wall that should be the open end
Since ironing with a plate thickness reduction rate of 10% is added, it is thought that local uneven deformation at the time of neck-in processing or flanging of the open end is suppressed, but the neck-in area has an organic coating. Deterioration such as whitening hardly occurs. Further, since the organic film is smoothed by ironing, printability is improved. Further, according to the present application, JP-A-7-275
With the 961, it is possible to easily form a highly anisotropic material, which has been difficult to use, a material which is likely to cause skin roughness due to processing of a high strength material, and the like.
【００２０】[0020]
【発明の実施の形態】成形時のダイスの、被加工材料と
接触する部分の表面温度Ｔｄ、しわ押え具のダイス平面
部と対向する部分の表面温度Ｔｓ、および抜け出し直後
のポンチ表面温度Ｔｐを、合成樹脂被膜のガラス転移温
度Ｔｇ＋５０℃以下で、Ｔｇ＋１０℃以上の温度範囲内
の適宜温度になるようにすると、成形中ダイスおよびし
わ押え具と有機被膜間の滑り摩擦抵抗は比較的小さく、
従って滑り摩擦抵抗が大きいことに基づく破胴が起こり
難い。また成形後のポンチのシームレス缶からの抜けが
容易となる。表面温度Ｔｄ、Ｔｓ、Ｔｐがガラス転移温
度Ｔｇ＋５０℃より高いと、合成樹脂被膜が成形の際に
軟化して、しごき加工の際に、外面有機被膜が削り取ら
れたり、あるいはポンチをシームレス缶から抜け出す際
に、内面合成樹脂被膜がポンチに密着して内面合成樹脂
被膜が破壊される等のトラブルが起こり易い。表面温度
Ｔｄ、Ｔｓ、ＴｐがＴｇ＋１０℃より低いと、しわ押さ
え面や加工コーナー等における滑り摩擦抵抗が大きくな
るので、破胴やポンチの抜け出し不良等が起こり易い。BEST MODE FOR CARRYING OUT THE INVENTION The surface temperature Td of the portion of the die that contacts the material to be processed during molding, the surface temperature Ts of the portion of the wrinkle retainer that faces the flat surface of the die, and the punch surface temperature Tp immediately after the removal When the glass transition temperature of the synthetic resin coating is Tg + 50 ° C. or lower and the temperature is appropriately set within the temperature range of Tg + 10 ° C. or higher, the sliding friction resistance between the die and the wrinkle retainer and the organic coating during molding is relatively small,
Therefore, it is difficult for a crush to occur due to the large sliding friction resistance. Further, the punch after molding can be easily removed from the seamless can. When the surface temperature Td, Ts, Tp is higher than the glass transition temperature Tg + 50 ° C, the synthetic resin film is softened during molding and the outer surface organic film is scraped off during ironing or the punch is pulled out from the seamless can. At this time, troubles such as the inner synthetic resin coating adheres to the punch and the inner synthetic resin coating is destroyed are likely to occur. If the surface temperatures Td, Ts, and Tp are lower than Tg + 10 ° C., the sliding friction resistance on the wrinkle holding surface, the processing corners, etc. becomes large, so that breakage of the punch or failure of punching out easily occurs.
【００２１】上記表面温度Ｔｄ、Ｔｓ、Ｔｐの制御は、
成形作業前にダイス、しわ押え具およびポンチ内を加温
し、成形開始直前に加温を冷却に切り替え、成形中冷却
し続けることによって行われる。ダイス、しわ押え具お
よびポンチが室温（例えば真冬の場合約５℃）の工具に
金属カップを装入して、成形を始めると、合成樹脂被膜
の温度がＴｇ＋１０℃より低く、動摩擦係数が高いた
め、破胴が発生したり、ポンチを成形されたシームレス
缶から抜け出すことができず、以後の成形作業が不可能
になる。しかしダイス、しわ押え具およびポンチ内を加
温して、表面温度Ｔｄ、Ｔｓ、ＴｐがＴｇ＋１０℃以上
の、合成樹脂被膜の特性に応じた適当な温度にしておい
た状態で、成形開始直前に加温を冷却に切り替えて成形
を開始すると、開始の瞬間（最初の金属カップの成形を
行う時）は表面温度Ｔｄ、Ｔｓ、ＴｐがＴｇ＋１０℃以
上の適当な温度であるため、トラブルなしに成形を開始
できる。成形加工の際、ダイスの被加工材料と接触する
部分、しわ押え具のダイス平面部と対向する部分および
ポンチの金属カップの側壁部と接触する部分に非常に大
きな力が加わり、これらの部分およびその近傍における
材料の加工熱と摩擦熱がダイス、しわ押え具、ポンチの
他の部分に熱伝達されて、成形回数の増加とともに、ダ
イス、しわ押え具、ポンチ全体の温度が次第に上昇す
る。しかし成形中冷却を続けることによって、表面温度
Ｔｄ、Ｔｓ、Ｔｐを合成樹脂被膜のガラス転移温度Ｔｇ
＋５０℃以下で、Ｔｇ＋１０℃以上の温度範囲内の適当
な温度になるようにすることができる。Control of the surface temperatures Td, Ts and Tp is as follows.
This is done by heating the inside of the die, the wrinkle retainer and the punch before the molding operation, switching the heating to cooling immediately before the start of molding, and continuing cooling during molding. When the die, wrinkle retainer and punch are loaded with a metal cup into a tool at room temperature (for example, about 5 ° C in the case of midwinter) and molding is started, the temperature of the synthetic resin film is lower than Tg + 10 ° C and the dynamic friction coefficient is high. The breakage occurs, and the punch cannot be pulled out from the molded seamless can, and the subsequent molding operation becomes impossible. However, immediately before the start of molding, the die, wrinkle retainer and punch are heated to a temperature suitable for the characteristics of the synthetic resin coating such that the surface temperatures Td, Ts and Tp are Tg + 10 ° C or higher. When the heating is switched to cooling and the molding is started, the surface temperature Td, Ts, Tp is an appropriate temperature of Tg + 10 ° C or higher at the moment of starting (when the first metal cup is molded), so molding is possible without any trouble. Can start. During molding, a very large force is applied to the portion of the die that contacts the work material, the portion of the wrinkle retainer that faces the die flat surface portion, and the portion that contacts the side wall portion of the punch metal cup, and these portions and The heat of processing and frictional heat of the material in the vicinity thereof are transferred to the die, the wrinkle retainer, and other parts of the punch, and the temperature of the die, the wrinkle retainer, and the punch as a whole gradually rises as the number of moldings increases. However, by continuing cooling during molding, the surface temperatures Td, Ts, and Tp are changed to the glass transition temperature Tg of the synthetic resin film.
At + 50 ° C. or lower, the temperature can be adjusted to an appropriate temperature within the temperature range of Tg + 10 ° C. or higher.
【００２２】本発明における同時絞りしごき加工はドラ
イ潤滑により行うことができる。ドライ潤滑とは、公知
のＤＩ缶製造において用いられるようなクーラント（ウ
エット潤滑）は用いず、片面約５０mg／ｍ２ 程度の例
えばパラフィンワックスや白色ワセリン・パーム油を用
いる潤滑のことを言う。同時絞りしごき加工を複数工程
を繰り返すことにより、Ｈ／Ｄ（Ｈ：容器高さ、Ｄ：容
器径）が大きく（通常１．５以上）かつ、次式で示す薄
肉化率が、The simultaneous drawing and ironing process in the present invention can be performed by dry lubrication. The dry lubrication refers to lubrication that does not use a coolant (wet lubrication) as used in the known manufacture of DI cans, but uses paraffin wax or white petrolatum palm oil of about 50 mg / m 2 on one side. By repeating the simultaneous drawing and ironing process in multiple steps, H / D (H: container height, D: container diameter) is large (usually 1.5 or more) and the thinning rate shown by the following formula is
【００２３】[0023]
【数２】 [Equation 2]
【００２４】ｔ０ ：元板厚 ｔｗ ：平均側壁厚 が、２０％〜７０％、にもなる容器の成形ができる。T 0 : original plate thickness t w : a container having an average side wall thickness of 20% to 70% can be molded.
【００２５】内容量３５０ml、Ｈ／Ｄ約１．９、薄肉化
率約５０％の容器では、三工程が好ましい。一工程の板
厚減少率は５〜５０％であって、そのうちしごきによる
薄肉化分が２〜３０％が適している。しごきによる薄肉
化が２％以下では絞りによる肌粗さの増大と異方性によ
る形状不良が抑制できない。一工程での板厚減少率が５
０％以上では缶胴が形成力に耐えられず破胴が生ずる危
険がある。合成樹脂被覆は６〜３０μｍであり、加工後
３〜１５μｍであることが好ましい。In a container having an inner volume of 350 ml, an H / D of about 1.9, and a thinning rate of about 50%, three steps are preferable. The plate thickness reduction rate in one step is 5 to 50%, and the thinning amount due to ironing is preferably 2 to 30%. If the thinning due to ironing is 2% or less, the increase in skin roughness due to drawing and the shape defect due to anisotropy cannot be suppressed. The plate thickness reduction rate in one process is 5
If it is more than 0%, the can body cannot withstand the forming force and there is a risk of breaking. The synthetic resin coating has a thickness of 6 to 30 μm, and preferably 3 to 15 μm after processing.
【００２６】[0026]
【実施例】以下に実施例を挙げて本発明をさらに詳しく
説明する。実施例および比較例に挙げる各容器は、表１
に示すように、それぞれのアルミニウム合金板の内外面
にポリエチレンテレフタレート８８モル％・ポリエチレ
ンイソフタレート１２モル％からなる厚み１２μｍの二
軸延伸された共重合ＰＥＴフイルムを熱接着（接着時の
金属基材温度：２３７℃）により被覆した材料を用い、
表に示すそれぞれの製造方法にてそれぞれの側壁厚みお
よび最終平均薄肉化率になるよう成形を行った。成形の
際の潤滑については、‘ドライ’ではワックスを、ウエ
ットについてはＤＩ缶成形用の公知の潤滑剤を用いた。
また、最終容器の内径および高さを同じにするために、
ブランクはそれぞれの最終平均薄肉化率に応じて以下の
径のものを用いた。
最終平均薄肉化率 ブランク径
６２ ％ １４０mm 容器内径 トリム前高さ
４６〜４８％ １５２mm ６６mm １２７mm
３５ ％ １６６mm
２０ ％ １７９mmEXAMPLES The present invention will be described in more detail with reference to the following examples. Table 1 shows each container listed in Examples and Comparative Examples.
As shown in Fig. 2, a biaxially stretched copolymer PET film of 88 mol% polyethylene terephthalate / 12 mol% polyethylene isophthalate and having a thickness of 12 µm is heat-bonded to the inner and outer surfaces of each aluminum alloy plate (metal substrate at the time of bonding). Temperature: 237 ° C.),
Molding was carried out by each manufacturing method shown in the table so that each side wall thickness and the final average thinning rate were obtained. For the lubrication at the time of molding, wax was used for'dry ', and a known lubricant for molding DI can was used for wet.
Also, in order to make the inner diameter and height of the final container the same,
A blank having the following diameter was used according to the final average thinning rate. Final average thinning rate Blank diameter 62% 140mm Container inner diameter Height before trim 46-48% 152mm 66mm 127mm 35% 166mm 20% 179mm
【００２７】また、表中の各工程における製造方法の略
号は以下の通りで、略号下の数字は各工程における側壁
の平均薄肉化率の増分のうちしごきによる薄肉化率分を
示す。
Ｄ ：絞り
ＳＤ：薄肉化を伴う絞り（Ｒｄ／ｔ０＝１．０〜２．
９）
Ｉ ：しごき（Ｉ＊３：しごき率の異なるしごきを３回
繰り返すの意）
Ｄ ＋Ｉ：同時絞りしごき
ＳＤ＋Ｉ：同時薄肉化絞りしごき
カップ状に成形された容器には、成形時に発生した被覆
樹脂の内部ひずみを緩和し金属基材との界面における接
着力を回復させるために、２２０℃にて３０秒間の熱処
理が施され（例３を除く）、その後は常法に従い、開口
端部をトリミングした後に下塗り用白色塗料を施すこと
なく印刷および仕上げニス塗装（２０５℃−１５秒焼付
け）を行い、さらに蓋を巻締めるためのネックイン加工
が施された。Further, the abbreviations of the manufacturing methods in the respective steps in the table are as follows, and the numbers below the abbreviations show the thinning rate due to ironing among the increments of the average thinning rate of the side wall in each step. D: diaphragm SD: diaphragm with thinning (Rd / t0 = 1.0 to 2.
9) I: Ironing (I * 3: Repeating ironing with different ironing ratios three times) D + I: Simultaneous drawing and ironing SD + I: Simultaneous thinning and drawing Ironing The cup-shaped container has a coating generated during molding. In order to relax the internal strain of the resin and restore the adhesive force at the interface with the metal substrate, a heat treatment was performed at 220 ° C. for 30 seconds (except for Example 3), and then the open end was subjected to a conventional method. After trimming, printing and finishing varnish coating (205 ° C. for 15 seconds baking) were performed without applying a white paint for undercoating, and neck-in processing for winding the lid was performed.
【００２８】なお、完成した容器の評価は以下の方法に
て行った。結果を表２に示す。
〈成形性〉 ５缶成形して、成否および被覆樹脂の白
化・削れ等の外観にて評価した。
〈外面色彩〉 成形可能であった条件の容器に対し、本
文中に記述の方法にて測定した。
〈印刷適性〉 ３色のインキ（紅・黄金・浅葱）におい
て、印刷色見本との比較による外観目視にて色の再現性
の比較を行った。
◎：ほとんど見分けがつかない。
○：やや見劣りするが実用可能。
×：明らかに色の再現性が悪い。（実用不可）
〈内面粗さ〉 成形可能であった条件の容器に対し、本
文中に記述の方法にて測定した。
〈耐食性〉 低酸性飲料を充填巻締めしたあと意図的
に胴壁部（ネックイン肩部直下）にデンティングを施
し、３７℃の条件下で３ヶ月保存したあとの缶内面胴壁
部（デンティング部）および胴上部（ネックイン部）の
被覆層の損傷および金属基材の腐食状態を観察した。
○：全く異常は認められない。
×：腐食が認められる。（実用不可）The completed container was evaluated by the following method. The results are shown in Table 2. <Moldability> Five cans were molded and evaluated for appearance and failure and appearance such as whitening and scraping of the coating resin. <Outer surface color> A container under the condition that it was moldable was measured by the method described in the text. <Printability> The color reproducibility of the three color inks (red, golden, and onion) was visually compared by comparison with a printing color sample. A: Almost indistinguishable. ○: A little inferior, but practical. X: Clearly poor color reproducibility. (Practical use not possible) <Inner surface roughness> A container under the condition that molding was possible was measured by the method described in the text. <Corrosion resistance> After filling and tightening a low-acid beverage, the body wall (immediately below the neck-in shoulder) was intentionally dented, and the can inner wall (den) was stored for 3 months at 37 ° C. Coating) and the upper part of the body (neck-in part), and the corrosion state of the metal substrate was observed. ◯: No abnormalities are observed. X: Corrosion is recognized. (Not practical)
【００２９】実施例１
厚み０．２６mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の両面をＰＥＴフイルムで被覆した材料を用い、
第一工程で同時絞りしごき加工（しごきによる薄肉化
分：６％）を行い、第二および第三工程で同時薄肉化絞
りしごき加工（しごきによる薄肉化分：各１５％）を施
して容器を製作した。その結果、外面が印刷適性に優
れ、パックしても内面に全く腐食の見られない容器が得
られた。Example 1 A material in which both sides of a JIS 3004H39 aluminum alloy plate having a thickness of 0.26 mm are coated with PET film is used.
Simultaneous drawing and ironing processing (thinning thinning: 6%) in the first step, and simultaneous thinning drawing and ironing processing (thinning thinning: 15% each) in the second and third steps I made it. As a result, a container having an excellent printability on the outer surface and no corrosion on the inner surface even when packed was obtained.
【００３０】実施例２
アルミニウム合金がＪＩＳ−５１８２Ｈ３９である以外
は実施例１と全く同じ材料構成および製造方法で容器を
形成した。５１８２材のような高強度材でも成形には問
題なく、印刷適性についても５０００系アルミニウム特
有の若干の黒みを帯びてはいるが問題なかった。また、
パック評価を行っても腐食は見られず、所望の容器が得
られた。Example 2 A container was formed by the same material constitution and manufacturing method as in Example 1 except that the aluminum alloy was JIS-5182H39. Even a high-strength material such as 5182 material has no problem in molding, and it has no problem in printability though it has a slight blackness peculiar to 5000 series aluminum. Also,
No corrosion was observed in the pack evaluation, and the desired container was obtained.
【００３１】実施例３
アルミニウム合金がＪＩＳ−１０５０Ｈ２４である以外
は実施例１と全く同じ材料構成および製造方法で容器を
形成した。成形・印刷適性・パック評価ともに問題な
く、所望の容器が得られた。Example 3 A container was formed by the same material constitution and manufacturing method as in Example 1 except that the aluminum alloy was JIS-1050H24. The desired container was obtained without any problems in molding, printability, and pack evaluation.
【００３２】比較例１
厚み０．２６mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の内面側のみをＰＥＴフイルムで被覆した材料を
用い、第一工程で同時絞りしごき加工（しごきによる薄
肉化分：６％）を行い、第二および第三工程で同時薄肉
化絞りしごき加工（しごきによる薄肉化分：各１５％）
を施して容器を製作しようとしたが、第三工程において
破胴して、所望の容器は得られなかった。Comparative Example 1 Using a material in which only the inner surface side of a JIS 3004H39 aluminum alloy plate having a thickness of 0.26 mm is coated with PET film, simultaneous drawing and ironing processing (thinning thinning: 6%) is performed in the first step. , Simultaneous thinning in the 2nd and 3rd steps Drawing and ironing (thinning thinning: 15% each)
However, the desired container was not obtained because the container was crushed in the third step.
【００３３】比較例２
樹脂による被覆を施していない厚み０．３０mmのＪＩＳ
３００４Ｈ３９アルミニウム合金板を公知のＤＩ缶製
造方法である通常の絞り、再絞り後、３段階のクリアラ
ンスでしごく方法により容器に成形した。その結果、正
反射光による金属光沢の強い外面にはなったが、印刷面
としての外観は非常に暗いものとなり、印刷適性に劣っ
ていた。COMPARATIVE EXAMPLE 2 0.30 mm thick JIS not coated with resin
A 3004H39 aluminum alloy plate was molded into a container by a known method for producing DI cans, which was a conventional method of drawing and redrawing, and a squeezing method with three stages of clearance. As a result, the outer surface had a strong metallic luster due to the specular reflection light, but the appearance as a printing surface was very dark and the printability was poor.
【００３４】比較例３
厚み０．３０mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の内外側をＰＥＴフイルムで被覆した材料を用
い、公知のＤＩ缶製造方法である通常の絞り、再絞り
後、３段階のクリアランスでしごく方法により容器を製
作しようとした。しかし、一部で外面被覆の削れが発生
し、かつ、内面についても腐食が見られ、所望の容器と
はならなかった。Comparative Example 3 Using a material in which the inside and outside of a JIS 3004H39 aluminum alloy plate having a thickness of 0.30 mm are coated with PET film, a known DI can manufacturing method is used for ordinary drawing, redrawing, and three-stage clearance. I tried to make a container by the squeezing method. However, the outer surface coating was partially scraped and the inner surface was also corroded, so that the desired container was not obtained.
【００３５】比較例４
厚み０．２６mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の両面をＰＥＴフイルムで被覆した材料を用い、
第一工程で通常の絞り加工のみ・第二工程で薄肉化を伴
う再絞り加工・第三工程で同時薄肉化絞りしごき加工
（しごきによる薄肉化分：５％）を施して容器を製作し
ようとした。しかし、肌粗れが著しく、それを起点とし
た破胴が生じ、所望の容器は得られなかった。Comparative Example 4 A material in which both sides of a JIS 3004H39 aluminum alloy plate having a thickness of 0.26 mm are coated with PET film,
Attempting to manufacture a container by applying only normal drawing in the first step, redrawing with thinning in the second step, simultaneous thinning drawing and ironing processing in the third step (thinning thinning: 5%) did. However, the skin was so rough that a crushing process was initiated from that, and the desired container could not be obtained.
【００３６】[0036]
【表１】 [Table 1]
【００３７】[0037]
【表２】 [Table 2]
【００３８】[0038]
【発明の効果】本発明の２ピースシームレスアルミニウ
ム容器は外面はパール顔料を施したような明るい外観を
有し、印刷適性が優れており、内面は耐腐蝕性が優れて
いる。そして本発明の製造方法によれば高異方性、高強
度材等の加工により肌粗れを生じ易い材料でも容易に成
形することができる。The two-piece seamless aluminum container of the present invention has a bright appearance like a pearl pigment on the outer surface, is excellent in printability, and is excellent in corrosion resistance on the inner surface. Further, according to the manufacturing method of the present invention, a material such as a material having high anisotropy and high strength which is likely to be roughened by processing can be easily molded.
【図１】Ｌ＊ ．ａ＊ ．ｂ＊ ．表色系立体説明図で
ある。FIG. 1 L * . a * . b * . It is a color system three-dimensional explanatory drawing.
【図２】Ｌ＊ ．ａ＊ ．ｂ＊ ．表色系色度図であ
る。FIG. 2: L * . a * . b * . It is a colorimetric chromaticity diagram.
Ｌ＊ 明度 ａ＊ 赤−緑方向の色相と彩度 ｂ＊ 青−黄方向の色相と彩度L * Lightness a * Red-green hue and saturation b * Blue-yellow hue and saturation
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１４年１０月２日（２００２．１０．
２）[Submission date] October 2, 2002 (2002.10.
2)
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 シームレスアルミニウム容器Title of invention Seamless aluminum container
【特許請求の範囲】[Claims]
【請求項２】 容器外面の明度と彩度の値が容器胴部外
面の高さ方向中央部で金属面を測定して得た値である、
請求項１に記載されたシームレスアルミニウム容器。 2. The values of lightness and saturation of the outer surface of the container are values obtained by measuring a metal surface at the central portion in the height direction of the outer surface of the container body,
The seamless aluminum container according to claim 1.
【請求項３】 Ｌ* 値、ａ* 値、ｂ* 値が、正反射
光除去方式により測定した反射率からＤ６５光源および
２°視野の条件により算出した値である、請求項１また
は２項に記載された、シームレスアルミニウム容器。 Wherein L * value, a * value, b * value is a value calculated by the conditions of D65 light source and 2 ° field of view with the reflectance measured by the positive reflection light removing system, also claim 1
Is a seamless aluminum container described in item 2 .
【請求項４】 最終容器側壁部の平均の薄肉化率が２０
〜７０％である、請求項１ないし３のいずれか１項に記
載されたシームレスアルミニウム容器。 4. The average thinning ratio of the side wall of the final container is 20.
The seamless aluminum container according to any one of claims 1 to 3 , which is ˜70%.
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】本発明は、パール顔料を施し
たような明るい外観を有する合成樹脂で被覆したシーム
レスアルミニウム缶に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seamless aluminum can coated with a synthetic resin having a bright appearance like a pearl pigment.
【０００２】[0002]
【従来の技術】[Prior art]
【特許文献１】特表平２−５０１６３８号公報
特許文献１には、金属シート又は両方の主要表面に非結
晶性ポリエステルのフイルムを直接接着したことを特徴
とする積層金属シートが記載されており、望ましい場
合、ポリエステル層は例えばアンチブロック剤で着色す
ることができ、その場合には、例えば二酸化チタンなど
のピグメント又は合成シリカを使用して彩色状態又は白
色の外観を与えるようにする、と記載されている。この
文献に記載されたものは積層金属の外面のポリエステル
層として、二酸化チタンなどの顔料をまぜたポリエステ
ル層を用いることによって、容器の外観を白色にするこ
とであって、外観の白色化には二酸化チタン等の顔料を
使用するものである。白色顔料を用いないで金属表面を
パール調の明るい外観とすることは全く記載されていな
い。従来のアルミニウム板を用いた２ピースシームレス
アルミニウム容器は絞り工程を２回行った後、しごき工
程を３回ウエット潤滑で行って胴壁部、胴上部の平均薄
肉化率約６２％の容器とした。このような方法では洗浄
工程が必要となり廃水処理、スラッジの発生等の問題が
あり、後工程で内面に塗料を塗装する必要があった。得
られる容器は金属光沢はあるが、明度が暗く、彩度が濃
いため印刷下地には適していない。合成樹脂を被覆した
アルミニウム板を用いて上記の従来方法で成形すると被
覆樹脂層が損傷し接着界面にかかる歪が増加するため接
着力が低下する欠点が生ずる。[Patent Document 1] Japanese Patent Publication No. 2-501638 Patent Document 1 describes a laminated metal sheet characterized in that a film of an amorphous polyester is directly adhered to the main surface of the metal sheet or both. , If desired, the polyester layer can be colored, for example with an antiblocking agent, in which case pigments or synthetic silicas, for example titanium dioxide, are used to give a colored or white appearance. Has been done. What is described in this document is to make the appearance of the container white by using a polyester layer mixed with a pigment such as titanium dioxide as the polyester layer on the outer surface of the laminated metal. A pigment such as titanium dioxide is used. No mention is made of making the metal surface have a pearly and bright appearance without using a white pigment. A two-piece seamless aluminum container using a conventional aluminum plate was subjected to a drawing process twice and an ironing process three times with wet lubrication to obtain a container having an average thinning rate of about 62% on the body wall and the body upper part. . In such a method, a washing step is required and there are problems such as wastewater treatment and sludge generation, and it is necessary to apply a paint to the inner surface in a later step. The resulting container has a metallic luster, but it is not suitable as a printing substrate because it has a dark brightness and a deep saturation. When the aluminum plate coated with a synthetic resin is molded by the above-mentioned conventional method, the coating resin layer is damaged and the strain applied to the adhesive interface is increased, so that the adhesive strength is lowered.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、内面の合成
樹脂被覆とアルミニウム表面の接着性を改善し、ネック
フランジ、巻締等の加工性を向上させるとともに外面を
パール顔料を施したような明度が明るく彩度の薄い、容
器を提供するものである。DISCLOSURE OF THE INVENTION The present invention improves the adhesion between the synthetic resin coating on the inner surface and the aluminum surface, improves the workability such as neck flange and winding, and at the same time applies the pearl pigment on the outer surface. It provides a container with lightness and light saturation.
【０００４】[0004]
【課題を解決するための手段】本発明は、
「１． 少なくとも容器外面側は無機顔料を含まない熱
可塑性樹脂で被覆した両面合成樹脂被覆したアルミニウ
ム板を用いて形成したシームレス容器において、容器の
外面がＬ* ａ* ｂ* 表色系色度で表わして、明度
Ｌ* 値がＬ* ＞６０であり、色度のａ* 値および
ｂ* 値から次式を用いて計算される彩度ｃ * が
ｃ* ＝（ａ*2＋ｂ*2）1/2 ＜５
の関係を満したシームレスアルミニウム容器。２
． 容器外面の明度と彩度の値が容器胴部外面の高さ
方向中央部で金属面を測定して得た値である、１項に記
載されたシームレスアルミニウム容器。３
． Ｌ* 値、ａ* 値、ｂ* 値が、正反射光除去方
式により測定した反射率からＤ６５光源および２°視野
の条件により算出した値である、１項または２項のいず
れか１項に記載された、シームレスアルミニウム容器。４
． 最終容器側壁部の平均の薄肉化率が２０〜７０％
である、１項ないし４項のいずれか１項に記載されたシ
ームレスアルミニウム容器。」に関する。The present invention comprises:
"1.At least the outer surface of the container does not contain inorganic pigment.
Both sides coated with plastic resinAluminium coated with synthetic resin
In a seamless container formed by using a
The outer surface is L* a* b* Lightness expressed in color system chromaticity
L* Value is L* > 60 and chromaticity a* Value and
b* Saturation c calculated from the value using the following formula * But
c* = (A* 2+ B* 2)1/2<5
Seamless aluminum container that satisfies the relationship ofTwo
． The value of lightness and saturation on the outer surface of the container is the height of the outer surface of the container body.
The value obtained by measuring the metal surface at the center of the direction
Seamless aluminum container on board.Three
． L* Value, a* Value, b* How to remove specular light
D65 light source and 2 ° field of view from the reflectance measured by the formula
1 term, which is the value calculated under the conditionOr 2Item
The seamless aluminum container described in item 1.Four
． Average thinning rate of the side wall of the final container is 20-70%
Which is 1 orFourThe system described in any one of
Chromeless aluminum container. Regarding
【０００５】本発明における明度と彩度はＬ* ａ* ｂ
* 表色系色度で表わした値である。通常アスタリス
（＊）ついていないＬａｂはハンターのＬａｂ表色系を
意味する。色は色相、明度、彩度の三属性によりなる
が、明度は明るさの度合を表わし、彩度はあざやかさの
度合を表わす。同じ色相であっても明度と彩度が異なれ
ば色感は異なる。図１により説明すると、Ｌ*． ａ*．
ｂ*．は表示単位であって、明度はＬ＊、色相と彩度を
表わす色度はａ＊ ．ｂ＊ ．で示される。ａ*．ｂ*．
は夫々色の方向を示し、ａ*．は赤−緑方向を示し、ｂ*
は黄−青方向を示す。図２はＬ*． ａ*．ｂ*．表色
系色度図であって、ａ* 値とｂ* 値が交差する点が色
度となる。彩度ｃ* はｃ* ＝（ａ*2＋ｂ*2）1/2 の式
で求められる。明度が大きいと明るくなり、彩度が小さ
いとあざやかさが小さくなる。したがって印刷の下地と
しては明度が大きく彩度の小さいことが好ましい。色度
ａ＊ 値とｂ＊ 値は例えばＭＩＮＯＬＴＡ株式会社製
ＣＭ−３７００ｄ（色彩管理ソフトウエアーＣＭ−Ｓ３
Ｗ）の分光測色計で測定して処理した値である。The lightness and saturation in the present invention are L * a * b.
* Value expressed in color system chromaticity. Usually, a Lab without an asterisk (*) means the Lab color system of Hunter. A color has three attributes of hue, lightness, and saturation. Lightness represents the degree of brightness, and saturation represents the degree of vividness. Even if the hue is the same, if the lightness and the saturation are different, the color feeling is different. Referring to FIG. 1, L * . a * .
b * . Is a display unit, lightness is L *, and chromaticity representing hue and saturation is a *. b *. Indicated by. a * . b * .
Indicates the color direction, and a * . Indicates red-green direction, b *
Indicates the yellow-blue direction. FIG. 2 shows L * . a * . b * . In the colorimetric chromaticity diagram, the chromaticity is the point where the a * value and the b * value intersect. The saturation c * is obtained by the equation c * = (a * 2 + b * 2 ) 1/2 . The higher the lightness, the brighter the image becomes, and the less the saturation, the less bright the image becomes. Therefore, it is preferable that the base of printing has a large lightness and a small saturation. The chromaticity a * value and b * value are, for example, CM-3700d (color management software CM-S3, manufactured by MINOLTA CORPORATION).
It is a value measured by the spectrocolorimeter W) and processed.
【０００６】アルミニウム容器は、アルミニウム板材を
絞り、しごき加工することにより製造されるが、この加
工時にアルミニウム板材の表面の微細な凹凸が消え、平
滑な金属光沢を有する表面となる。ところが、本発明の
ように合成樹脂を被覆したアルミニウム板材を用いる表
面が合成樹脂で被覆され保護されているので、加工後も
アルミニウム板材の表面の微細な凹凸が残り平滑な金属
光沢の面とはならない。容器外面の明度Ｌ* 値がＬ*
＞６０であり、彩度ｃ* 値がｃ* ＜５であるとパール
顔料を施したような乳白色面となり、容器に印刷する場
合白色の下塗りをしなくても色の表現に優れているため
直接印刷することができる効果がある。内面は、内容物
と接するため、経時的耐腐食特性が要求される。このた
めには、被覆している樹脂自身の特性も重要だがアルミ
板材と被覆する合成樹脂被覆の接着性の大きいことも、
もっと必要である。一般に金属基材と合成樹脂被覆との
接着力は、容器の成形加工や、ネックフランジ加工、巻
締加工等に伴い低下する傾向にあり、その値は、初期接
着力や加工歪の程度、加工後の熱処理の有無、基材表面
の粗さと密接な関係がある。The aluminum container is made of aluminum plate material.
It is manufactured by drawing and ironing.
During the work, fine irregularities on the surface of the aluminum plate disappear and
The surface has a smooth metallic luster. However, according to the present invention
Table using aluminum plate coated with synthetic resin
The surface is covered with synthetic resin and protected, so even after processing
A smooth metal with fine irregularities on the surface of the aluminum plate
It does not have a glossy surface. The lightness L * value on the outer surface of the container is L *
When it is> 60 and the saturation c * value is c * <5, it becomes a milky white surface like a pearl pigment, and when printing on a container, it is excellent in color expression without white undercoating. It has the effect that it can be printed directly. Since the inner surface is in contact with the content, corrosion resistance over time is required. For this purpose, the characteristics of the resin itself that is coated are important, but the adhesiveness of the synthetic resin coating that covers the aluminum plate is also large,
I need more. Generally, the adhesive force between the metal base material and the synthetic resin coating tends to decrease with the forming process of the container, the neck flange process, the winding process, etc., and the value is the initial adhesive force, the degree of process strain, the process It has a close relationship with the presence or absence of subsequent heat treatment and the roughness of the substrate surface.
【０００７】容器内面のアルミニウム面の表面粗さの測
定は、底部、胴部、とも圧延による条痕に対し直角の方
向に行い、胴部はその方向が容器の高さ方向となる位置
（９０°）で測定した。（図参照）測定条件はカットオ
フ０．８mm、測定長さ２mm、各点とも５回測定して平均
する。The surface roughness of the aluminum surface of the inner surface of the container is measured in the direction perpendicular to the streaks caused by rolling, both the bottom and the body, and the body is located at a position where the direction is the height direction of the container (90). °). (Refer to the figure) The measurement conditions are a cutoff of 0.8 mm, a measurement length of 2 mm, and each point is measured 5 times and averaged.
【０００８】アルミニウム板に被覆する合成樹脂被覆と
しては熱可塑性樹脂でなければならないが、具体的に
は、ポリエチレン、ポリプロピレン、エチレン−プロピ
レン共重合体、エチレン−酢酸ビニル共重合体、エチレ
ン−アクリルエステル共重合体、アイオノマー等のオレ
フィン系樹脂フイルム；ポリエチレンテレフタレート、
ポリブチレンテレフタレート、エチレンテレフタレート
／イソフタレート共重合体等のポリエステル；ナイロン
６、ナイロン６，６、ナイロン１１、ナイロン１２等の
ポリアミド；ポリ塩化ビニル；ポリ塩化ビニリデン等を
挙げることができる。上記樹脂で被覆される原板は、缶
成形後あるいはバルジ成形後の密着性及び耐食性をより
良好な状態に維持するために、表面に化成処理層を有す
ることが望ましい。化成処理皮膜としては、加工性の他
に、耐水性あるいは耐食性を有することが特に重要であ
り、例えば、従来より塗装下地用の化成処理として利用
されているりん酸クロメート、あるいは、ジルコニウム
やチタンの酸化物を主成分とする化成皮膜、あるいはポ
リアクリル酸−ジルコニウム塩の複合皮膜等がある。皮
膜量としては、金属分としてＴｉ、Ｃｒ、Ｚｒを含む場
合には当該金属量で、５〜３００mg／ｍ2 程度が好ま
しい。被覆は、溶融させた樹脂の押出しコートであって
も、製膜後にフイルムとして熱接着を行ったものでも良
い。[000 8] Although the aluminum plate coated synthetic resin coating must be thermoplastic resins include polyethylene, polypropylene, ethylene - propylene copolymer, ethylene - vinyl acetate copolymer, ethylene - acrylic Olefin resin films such as ester copolymers and ionomers; polyethylene terephthalate,
Examples thereof include polyesters such as polybutylene terephthalate and ethylene terephthalate / isophthalate copolymers; polyamides such as nylon 6, nylon 6,6, nylon 11 and nylon 12; polyvinyl chloride; polyvinylidene chloride. The original plate coated with the above resin preferably has a chemical conversion treatment layer on its surface in order to maintain the adhesiveness and corrosion resistance after can forming or bulge forming in a better state. As the chemical conversion coating, it is particularly important to have water resistance or corrosion resistance in addition to workability. For example, chromate phosphate, which has been conventionally used as a chemical conversion treatment for a coating base, or zirconium or titanium. There are a chemical conversion film containing an oxide as a main component, a composite film of polyacrylic acid-zirconium salt, and the like. The coating amount is preferably about 5 to 300 mg / m 2 in the case where Ti, Cr, and Zr are included as the metal content in terms of the metal amount. The coating may be an extrusion coating of melted resin or a film which has been thermally adhered as a film after film formation.
【０００９】本発明のシームレスアルミニウム容器は、
両面を合成樹脂で被覆されたアルミニウム板をしわ押え
具で押えつつドライ潤滑によりポンチを前進させて絞り
加工コーナーで絞り加工を行うとともに、さらにポンチ
を前進させて該加工コーナーの前端部に接続するしごき
部と協働してしごき加工を行って、側壁部の板厚が元板
厚よりも薄い前工程カップを絞り加工としごき加工を同
時に行う同時絞りしごき加工で形成する第一工程と、そ
のカップの底部の周縁部をしわ押え具で押えつつ、ドラ
イ潤滑により再絞りポンチを前進させて、カップの側面
部をダイスの曲率半径の小さい絞り加工コーナーに密接
させて、再絞り加工を行いカップを縮径するとともに、
ダイス絞り加工コーナー部で曲げ延伸を行って側壁の板
厚を減少し、さらにポンチを前進させて、該加工コーナ
ーの前端部に接続するしごき部と協働して絞り加工を行
って、側壁部の板厚を減少させて均一厚とする同時薄肉
化絞りしごき加工による再絞り工程を少なくとも１回工
程行うことにより製造することができる。[000 9] seamless aluminum container of the present invention,
While pressing the aluminum plate coated with synthetic resin on both sides with the wrinkle retainer, the punch is advanced by dry lubrication to draw at the drawing corner, and the punch is further advanced to connect to the front end of the processing corner. Performing ironing in cooperation with the ironing part, the first step of forming by the simultaneous drawing and ironing process in which the pre-process cup in which the plate thickness of the side wall part is thinner than the original plate thickness is simultaneously drawn and ironed While pressing the peripheral edge of the bottom of the cup with the wrinkle retainer, advance the redraw punch by dry lubrication to bring the side surface of the cup into close contact with the drawing corner with a small radius of curvature of the die and perform redraw processing. While reducing the diameter of
Die drawing The bending of the corner is performed at the corner to reduce the thickness of the side wall, the punch is further advanced, and the drawing is performed in cooperation with the ironing part connected to the front end of the processing corner. It can be manufactured by performing at least one redrawing step by simultaneous thinning and ironing to reduce the plate thickness to a uniform thickness.
【００１０】再絞り工程におけるダイス絞り加工コーナ
ーの大きさＲｄが元板厚さｔ0 との比で表わして
１．０＜Ｒｄ／ｔ0 ＜２．９
の範囲であると、再絞り加工中の材料が加工コーナー部
を通過する際に薄肉化を生じて容器全体としての薄肉化
度確保に寄与すると同時に、望ましい内面の表面粗さが
発現するという利点がある。[001 0] If the size Rd die drawing corner of redrawing step is in the range of, expressed in the ratio 1.0 <Rd / t 0 <2.9 with Motoita thickness t 0, Redrawing There is an advantage that the inner material is thinned when passing through the processing corner portion, which contributes to secure the thinning degree of the entire container and at the same time, a desired inner surface roughness is exhibited.
【００１１】一工程での薄肉化率が３〜５０％であっ
て、そのうちの再絞りしごき工程でのしごきによる薄肉
化が２〜３０％であることが好ましいが一工程での薄肉
化率が５〜３５％の範囲が最も好ましい。このような同
時絞りしごき加工及び同時薄肉化絞りしごき加工を複数
回行うことにより側壁部の薄肉化の破断限界が向上し、
薄肉の側壁部を形成することができ、さらに外面の明度
と彩度を調節し、内面の表面粗さを調節することができ
る。[001 1] One thinning rate in the step a from 3 to 50% thinner rate by is preferred one step thinner is 2 to 30 percent by ironing at redrawing ironing process of which Is most preferably in the range of 5 to 35%. By performing such simultaneous drawing and ironing and simultaneous thinning and ironing multiple times, the fracture limit for thinning the side wall is improved,
A thin side wall portion can be formed, and further, the brightness and saturation of the outer surface can be adjusted, and the surface roughness of the inner surface can be adjusted.
【００１２】絞り加工において、ダイスの加工コーナー
の曲率半径が小さいので、加工コーナーでの曲げ延伸に
よって、金属カップの側壁部が薄肉化される。加工コー
ナーでの曲げ延伸後しごき加工を受けるが、曲げ延伸の
際に加わる力が側壁部の高さ方向であるのに対して、し
ごき加工の場合は板厚方向である。このように１ストロ
ークで絞りとしごきを行うことにより、絞り加工のバッ
クテンションをかけながらしごくことにより被覆の破壊
防ぐことができる。一般にしごき加工により破断限界は
向上するが、力の加わる方向が異なる曲げ延伸加工にし
ごき加工を加えることにより、さらに両者の相乗的な力
の相互作用から、大幅な薄肉化を実現することができ
る。従って比較的細長い、好ましくは高さ／直径の比が
１以上のシームレス缶を製造できる。またしごき加工の
際、側壁部は、ポンチとしごき部間の間隙部を通過して
しごかれて、間隙部の間隙幅に実質的に等しい厚さに薄
肉化されるので、しごき中の高さ方向の間隙幅を制御す
ることにより、側壁部の高さ方向肉厚を制御できる。ま
た間隙幅を周方向に一定にすることにより、側壁部の周
方向の厚さの均一化を実現できる。[001 2] In drawing, since the radius of curvature of the working corner of the die is small, the bending stretching in process corner, the side wall portion of the metal cup is thinned. Although ironing is performed after bending and stretching at the processing corner, the force applied during bending and stretching is in the height direction of the side wall, whereas in the case of ironing, it is in the plate thickness direction. By performing the drawing and ironing with one stroke in this way, it is possible to prevent the coating from being broken by ironing while applying the back tension for drawing. Generally, the breaking limit is improved by ironing, but by bending and stretching in which the force application direction is different and ironing is performed, it is possible to achieve a significant reduction in wall thickness due to the synergistic interaction between the two. . It is therefore possible to produce relatively cans, preferably seamless cans with a height / diameter ratio of 1 or more. Also, during ironing, the side wall portion is squeezed through the gap between the punch and the ironing portion and is thinned to a thickness substantially equal to the gap width of the gap portion. By controlling the gap width in the depth direction, the thickness in the height direction of the side wall portion can be controlled. Further, by making the gap width constant in the circumferential direction, it is possible to realize uniform circumferential thickness of the side wall portion.
【００１３】合成樹脂被膜は、再絞り加工により高さ方
向への一軸延伸により薄肉化されるが、しごき加工の際
に、厚さ方向の面圧力を受けながら薄肉化されるため、
再絞り加工のみの場合とは異なり、側壁部の厚さ分布が
均一になる。開口端部となるべき側壁部に少なくとも５
％の板厚減少率のしごき加工が加えられるので、開口端
部がネックイン加工やフランジ加工される際の局所的な
不均一変形が押さえられるためと考えられるが、ネック
イン部に有機被膜の白化等の劣化が起こり難くなる。ま
た有機被膜はしごき加工により平滑化するので、印刷適
性が向上する。また、本願によれば、特開平７−２７５
９６１では、利用が困難だった高異方性材、高強度材の
加工による肌粗れを生じやすい材料等でも容易に成形す
ることができる。[001 3] Synthetic resin coating is being thinned by uniaxial stretching in the height direction by the re-drawing, because during ironing, are thinned while being subjected to a surface pressure in the thickness direction,
Unlike the case of only redrawing, the thickness distribution of the side wall becomes uniform. At least 5 on the side wall that should be the open end
Since ironing with a plate thickness reduction rate of 10% is added, it is thought that local uneven deformation at the time of neck-in processing or flanging of the open end is suppressed, but the neck-in area has an organic coating. Deterioration such as whitening hardly occurs. Further, since the organic film is smoothed by ironing, printability is improved. Further, according to the present application, JP-A-7-275
With the 961, it is possible to easily form a highly anisotropic material, which has been difficult to use, a material which is likely to cause skin roughness due to processing of a high strength material, and the like.
【００１４】[00 14 ]
【発明の実施の形態】成形時のダイスの、被加工材料と
接触する部分の表面温度Ｔｄ、しわ押え具のダイス平面
部と対向する部分の表面温度Ｔｓ、および抜け出し直後
のポンチ表面温度Ｔｐを、合成樹脂被膜のガラス転移温
度Ｔｇ＋５０℃以下で、Ｔｇ＋１０℃以上の温度範囲内
の適宜温度になるようにすると、成形中ダイスおよびし
わ押え具と有機被膜間の滑り摩擦抵抗は比較的小さく、
従って滑り摩擦抵抗が大きいことに基づく破胴が起こり
難い。また成形後のポンチのシームレス缶からの抜けが
容易となる。表面温度Ｔｄ、Ｔｓ、Ｔｐがガラス転移温
度Ｔｇ＋５０℃より高いと、合成樹脂被膜が成形の際に
軟化して、しごき加工の際に、外面有機被膜が削り取ら
れたり、あるいはポンチをシームレス缶から抜け出す際
に、内面合成樹脂被膜がポンチに密着して内面合成樹脂
被膜が破壊される等のトラブルが起こり易い。表面温度
Ｔｄ、Ｔｓ、ＴｐがＴｇ＋１０℃より低いと、しわ押さ
え面や加工コーナー等における滑り摩擦抵抗が大きくな
るので、破胴やポンチの抜け出し不良等が起こり易い。BEST MODE FOR CARRYING OUT THE INVENTION The surface temperature Td of the portion of the die that contacts the material to be processed during molding, the surface temperature Ts of the portion of the wrinkle retainer that faces the flat surface of the die, and the punch surface temperature Tp immediately after the removal When the glass transition temperature of the synthetic resin coating is Tg + 50 ° C. or lower and the temperature is appropriately set within the temperature range of Tg + 10 ° C. or higher, the sliding friction resistance between the die and the wrinkle retainer and the organic coating during molding is relatively small,
Therefore, it is difficult for a crush to occur due to the large sliding friction resistance. Further, the punch after molding can be easily removed from the seamless can. When the surface temperature Td, Ts, Tp is higher than the glass transition temperature Tg + 50 ° C, the synthetic resin film is softened during molding and the outer surface organic film is scraped off during ironing or the punch is pulled out from the seamless can. At this time, troubles such as the inner synthetic resin coating adheres to the punch and the inner synthetic resin coating is destroyed are likely to occur. If the surface temperatures Td, Ts, and Tp are lower than Tg + 10 ° C., the sliding friction resistance on the wrinkle holding surface, the processing corners, etc. becomes large, so that breakage of the punch or failure of punching out easily occurs.
【００１５】上記表面温度Ｔｄ、Ｔｓ、Ｔｐの制御は、
成形作業前にダイス、しわ押え具およびポンチ内を加温
し、成形開始直前に加温を冷却に切り替え、成形中冷却
し続けることによって行われる。ダイス、しわ押え具お
よびポンチが室温（例えば真冬の場合約５℃）の工具に
金属カップを装入して、成形を始めると、合成樹脂被膜
の温度がＴｇ＋１０℃より低く、動摩擦係数が高いた
め、破胴が発生したり、ポンチを成形されたシームレス
缶から抜け出すことができず、以後の成形作業が不可能
になる。しかしダイス、しわ押え具およびポンチ内を加
温して、表面温度Ｔｄ、Ｔｓ、ＴｐがＴｇ＋１０℃以上
の、合成樹脂被膜の特性に応じた適当な温度にしておい
た状態で、成形開始直前に加温を冷却に切り替えて成形
を開始すると、開始の瞬間（最初の金属カップの成形を
行う時）は表面温度Ｔｄ、Ｔｓ、ＴｐがＴｇ＋１０℃以
上の適当な温度であるため、トラブルなしに成形を開始
できる。成形加工の際、ダイスの被加工材料と接触する
部分、しわ押え具のダイス平面部と対向する部分および
ポンチの金属カップの側壁部と接触する部分に非常に大
きな力が加わり、これらの部分およびその近傍における
材料の加工熱と摩擦熱がダイス、しわ押え具、ポンチの
他の部分に熱伝達されて、成形回数の増加とともに、ダ
イス、しわ押え具、ポンチ全体の温度が次第に上昇す
る。しかし成形中冷却を続けることによって、表面温度
Ｔｄ、Ｔｓ、Ｔｐを合成樹脂被膜のガラス転移温度Ｔｇ
＋５０℃以下で、Ｔｇ＋１０℃以上の温度範囲内の適当
な温度になるようにすることができる。 [00 15] The surface temperature Td, Ts, control of Tp is,
This is done by heating the inside of the die, the wrinkle retainer and the punch before the molding operation, switching the heating to cooling immediately before the start of molding, and continuing cooling during molding. When the die, wrinkle retainer and punch are loaded with a metal cup into a tool at room temperature (for example, about 5 ° C in the case of midwinter) and molding is started, the temperature of the synthetic resin film is lower than Tg + 10 ° C and the dynamic friction coefficient is high. The breakage occurs, and the punch cannot be pulled out from the molded seamless can, and the subsequent molding operation becomes impossible. However, immediately before the start of molding, the die, wrinkle retainer and punch are heated to a temperature suitable for the characteristics of the synthetic resin coating such that the surface temperatures Td, Ts and Tp are Tg + 10 ° C or higher. When the heating is switched to cooling and the molding is started, the surface temperature Td, Ts, Tp is an appropriate temperature of Tg + 10 ° C or higher at the moment of starting (when the first metal cup is molded), so molding is possible without any trouble. Can start. During molding, a very large force is applied to the portion of the die that contacts the work material, the portion of the wrinkle retainer that faces the die flat surface portion, and the portion that contacts the side wall portion of the punch metal cup, and these portions and The heat of processing and frictional heat of the material in the vicinity thereof are transferred to the die, the wrinkle retainer, and other parts of the punch, and the temperature of the die, the wrinkle retainer, and the punch as a whole gradually rises as the number of moldings increases. However, by continuing cooling during molding, the surface temperatures Td, Ts, and Tp are changed to the glass transition temperature Tg of the synthetic resin film.
At + 50 ° C. or lower, the temperature can be adjusted to an appropriate temperature within the temperature range of Tg + 10 ° C. or higher.
【００１６】本発明における同時絞りしごき加工はドラ
イ潤滑により行うことができる。ドライ潤滑とは、公知
のＤＩ缶製造において用いられるようなクーラント（ウ
エット潤滑）は用いず、片面約５０mg／ｍ2 程度の例
えばパラフィンワックスや白色ワセリン・パーム油を用
いる潤滑のことを言う。同時絞りしごき加工を複数工程
を繰り返すことにより、Ｈ／Ｄ（Ｈ：容器高さ、Ｄ：容
器径）が大きく（通常１．５以上）かつ、次式で示す薄
肉化率が、[00 16] simultaneously drawing and ironing in the present invention can be performed by dry lubrication. The dry lubrication refers to lubrication using, for example, paraffin wax or white petrolatum palm oil of about 50 mg / m 2 on one side without using a coolant (wet lubrication) as used in the production of known DI cans. By repeating the simultaneous drawing and ironing process in multiple steps, H / D (H: container height, D: container diameter) is large (usually 1.5 or more) and the thinning rate shown by the following formula is
【００１７】[00 17 ]
【数１】 [Equation 1 ]
【００１８】ｔ0 ：元板厚 ｔw ：平均側壁厚 が、２０％〜７０％、にもなる容器の成形ができる。 [00 18] t 0: initial thickness t w: average side wall thickness, it is formed of 20% to 70%, also in the container.
【００１９】内容量３５０ml、Ｈ／Ｄ約１．９、薄肉化
率約５０％の容器では、三工程が好ましい。一工程の板
厚減少率は５〜５０％であって、そのうちしごきによる
薄肉化分が２〜３０％が適している。しごきによる薄肉
化が２％以下では絞りによる肌粗さの増大と異方性によ
る形状不良が抑制できない。一工程での板厚減少率が５
０％以上では缶胴が形成力に耐えられず破胴が生ずる危
険がある。合成樹脂被覆は６〜３０μｍであり、加工後
３〜１５μｍであることが好ましい。 [00 19] Contents 350 ml, H / D of about 1.9, a container of approximately 50% thinner rate, third step is preferred. The plate thickness reduction rate in one step is 5 to 50%, and the thinning amount due to ironing is preferably 2 to 30%. If the thinning due to ironing is 2% or less, the increase in skin roughness due to drawing and the shape defect due to anisotropy cannot be suppressed. The plate thickness reduction rate in one process is 5
If it is more than 0%, the can body cannot withstand the forming force and there is a risk of breaking. The synthetic resin coating has a thickness of 6 to 30 μm, and preferably 3 to 15 μm after processing.
【００２０】002 0
【実施例】以下に実施例を挙げて本発明をさらに詳しく
説明する。実施例および比較例に挙げる各容器は、表１
に示すように、それぞれのアルミニウム合金板の内外面
にポリエチレンテレフタレート８８モル％・ポリエチレ
ンイソフタレート１２モル％からなる厚み１２μｍの二
軸延伸された共重合ＰＥＴフイルムを熱接着（接着時の
金属基材温度：２３７℃）により被覆した材料を用い、
表に示すそれぞれの製造方法にてそれぞれの側壁厚みお
よび最終平均薄肉化率になるよう成形を行った。成形の
際の潤滑については、‘ドライ’ではワックスを、ウエ
ットについてはＤＩ缶成形用の公知の潤滑剤を用いた。
また、最終容器の内径および高さを同じにするために、
ブランクはそれぞれの最終平均薄肉化率に応じて以下の
径のものを用いた。
最終平均薄肉化率 ブランク径
６２ ％ １４０mm 容器内径 トリム前高さ
４６〜４８％ １５２mm ６６mm １２７mm
３５ ％ １６６mm
２０ ％ １７９mmEXAMPLES The present invention will be described in more detail with reference to the following examples. Table 1 shows each container listed in Examples and Comparative Examples.
As shown in Fig. 2, a biaxially stretched copolymer PET film of 88 mol% polyethylene terephthalate / 12 mol% polyethylene isophthalate and having a thickness of 12 µm is heat-bonded to the inner and outer surfaces of each aluminum alloy plate (metal substrate at the time of bonding). Temperature: 237 ° C.),
Molding was carried out by each manufacturing method shown in the table so that each side wall thickness and the final average thinning rate were obtained. For the lubrication at the time of molding, wax was used for'dry ', and a known lubricant for molding DI can was used for wet.
Also, in order to make the inner diameter and height of the final container the same,
A blank having the following diameter was used according to the final average thinning rate. Final average thinning rate Blank diameter 62% 140mm Container inner diameter Height before trim 46-48% 152mm 66mm 127mm 35% 166mm 20% 179mm
【００２１】また、表中の各工程における製造方法の略
号は以下の通りで、略号下の数字は各工程における側壁
の平均薄肉化率の増分のうちしごきによる薄肉化率分を
示す。
Ｄ ：絞り
ＳＤ：薄肉化を伴う絞り（Ｒｄ／ｔ０＝１．０〜２．
９）
Ｉ ：しごき（Ｉ＊３：しごき率の異なるしごきを３回
繰り返すの意）
Ｄ ＋Ｉ：同時絞りしごき
ＳＤ＋Ｉ：同時薄肉化絞りしごき
カップ状に成形された容器には、成形時に発生した被覆
樹脂の内部ひずみを緩和し金属基材との界面における接
着力を回復させるために、２２０℃にて３０秒間の熱処
理が施され（例３を除く）、その後は常法に従い、開口
端部をトリミングした後に下塗り用白色塗料を施すこと
なく印刷および仕上げニス塗装（２０５℃−１５秒焼付
け）を行い、さらに蓋を巻締めるためのネックイン加工
が施された。[002 1] In addition, in as abbreviations following manufacturing method in each step in the table, the numbers under the abbreviation indicates the thinning rate caused by squeezing of the increments of the average thickness reduction rate of the side wall in each step. D: diaphragm SD: diaphragm with thinning (Rd / t0 = 1.0 to 2.
9) I: Ironing (I * 3: Repeating ironing with different ironing ratios three times) D + I: Simultaneous drawing and ironing SD + I: Simultaneous thinning and drawing Ironing The cup-shaped container has a coating generated during molding. In order to relax the internal strain of the resin and restore the adhesive force at the interface with the metal substrate, a heat treatment was performed at 220 ° C. for 30 seconds (except for Example 3), and then the open end was subjected to a conventional method. After trimming, printing and finishing varnish coating (205 ° C. for 15 seconds baking) were performed without applying a white paint for undercoating, and neck-in processing for winding the lid was performed.
【００２２】なお、完成した容器の評価は以下の方法に
て行った。結果を表２に示す。
〈成形性〉 ５缶成形して、成否および被覆樹脂の白
化・削れ等の外観にて評価した。
〈外面色彩〉 成形可能であった条件の容器に対し、本
文中に記述の方法にて測定した。
〈印刷適性〉 ３色のインキ（紅・黄金・浅葱）におい
て、印刷色見本との比較による外観目視にて色の再現性
の比較を行った。
◎：ほとんど見分けがつかない。
○：やや見劣りするが実用可能。
×：明らかに色の再現性が悪い。（実用不可）
〈内面粗さ〉 成形可能であった条件の容器に対し、本
文中に記述の方法にて測定した。
〈耐食性〉 低酸性飲料を充填巻締めしたあと意図的
に胴壁部（ネックイン肩部直下）にデンティングを施
し、３７℃の条件下で３ヶ月保存したあとの缶内面胴壁
部（デンティング部）および胴上部（ネックイン部）の
被覆層の損傷および金属基材の腐食状態を観察した。
○：全く異常は認められない。
×：腐食が認められる。（実用不可）[002 2] The evaluation of the finished vessel was carried out by the following method. The results are shown in Table 2. <Moldability> Five cans were molded and evaluated for appearance and failure and appearance such as whitening and scraping of the coating resin. <Outer surface color> A container under the condition that it was moldable was measured by the method described in the text. <Printability> The color reproducibility of the three color inks (red, golden, and onion) was visually compared by comparison with a printing color sample. A: Almost indistinguishable. ○: A little inferior, but practical. X: Clearly poor color reproducibility. (Practical use not possible) <Inner surface roughness> A container under the condition that molding was possible was measured by the method described in the text. <Corrosion resistance> After filling and tightening a low-acid beverage, the body wall (immediately below the neck-in shoulder) was intentionally dented, and the can inner wall (den) was stored for 3 months at 37 ° C. Coating) and the upper part of the body (neck-in part), and the corrosion state of the metal substrate was observed. ◯: No abnormalities are observed. X: Corrosion is recognized. (Not practical)
【００２３】実施例１
厚み０．２６mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の両面をＰＥＴフイルムで被覆した材料を用い、
第一工程で同時絞りしごき加工（しごきによる薄肉化
分：６％）を行い、第二および第三工程で同時薄肉化絞
りしごき加工（しごきによる薄肉化分：各１５％）を施
して容器を製作した。その結果、外面が印刷適性に優
れ、パックしても内面に全く腐食の見られない容器が得
られた。[002 3] using a material coated with PET film on both sides of JIS 3004H39 aluminum alloy plate of Example 1 thickness 0.26 mm,
Simultaneous drawing and ironing processing (thinning thinning: 6%) in the first step, and simultaneous thinning drawing and ironing processing (thinning thinning: 15% each) in the second and third steps I made it. As a result, a container having an excellent printability on the outer surface and no corrosion on the inner surface even when packed was obtained.
【００２４】実施例２
アルミニウム合金がＪＩＳ−５１８２Ｈ３９である以外
は実施例１と全く同じ材料構成および製造方法で容器を
形成した。５１８２材のような高強度材でも成形には問
題なく、印刷適性についても５０００系アルミニウム特
有の若干の黒みを帯びてはいるが問題なかった。また、
パック評価を行っても腐食は見られず、所望の容器が得
られた。 [00 24] Example 2 aluminum alloy to form a container in the first embodiment and identical material composition and the manufacturing method other than a JIS-5182H39. Even a high-strength material such as 5182 material has no problem in molding, and it has no problem in printability though it has a slight blackness peculiar to 5000 series aluminum. Also,
No corrosion was observed in the pack evaluation, and the desired container was obtained.
【００２５】実施例３
アルミニウム合金がＪＩＳ−１０５０Ｈ２４である以外
は実施例１と全く同じ材料構成および製造方法で容器を
形成した。成形・印刷適性・パック評価ともに問題な
く、所望の容器が得られた。 [00 25] Example 3 Aluminum alloy to form a container in the first embodiment and identical material composition and the manufacturing method other than a JIS-1050H24. The desired container was obtained without any problems in molding, printability, and pack evaluation.
【００２６】比較例１
厚み０．２６mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の内面側のみをＰＥＴフイルムで被覆した材料を
用い、第一工程で同時絞りしごき加工（しごきによる薄
肉化分：６％）を行い、第二および第三工程で同時薄肉
化絞りしごき加工（しごきによる薄肉化分：各１５％）
を施して容器を製作しようとしたが、第三工程において
破胴して、所望の容器は得られなかった。 [00 26] using a material only inner surface was coated with a PET film of JIS 3004H39 aluminum alloy sheet of Comparative Example 1 thickness 0.26 mm, co-drawing and ironing in the first step (thinning caused by ironing: 6%) of Performed and simultaneously reduced the thickness in the 2nd and 3rd steps Drawing and ironing (thinning thinning: 15% each)
However, the desired container was not obtained because the container was crushed in the third step.
【００２７】比較例２
樹脂による被覆を施していない厚み０．３０mmのＪＩＳ
３００４Ｈ３９アルミニウム合金板を公知のＤＩ缶製
造方法である通常の絞り、再絞り後、３段階のクリアラ
ンスでしごく方法により容器に成形した。その結果、正
反射光による金属光沢の強い外面にはなったが、印刷面
としての外観は非常に暗いものとなり、印刷適性に劣っ
ていた。 [00 27] JIS of 0.30mm thickness not subjected to coating with Comparative Example 2 Resin
A 3004H39 aluminum alloy plate was molded into a container by a known method for producing DI cans, which was a conventional method of drawing and redrawing, and a squeezing method with three stages of clearance. As a result, the outer surface had a strong metallic luster due to the specular reflection light, but the appearance as a printing surface was very dark and the printability was poor.
【００２８】比較例３
厚み０．３０mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の内外側をＰＥＴフイルムで被覆した材料を用
い、公知のＤＩ缶製造方法である通常の絞り、再絞り
後、３段階のクリアランスでしごく方法により容器を製
作しようとした。しかし、一部で外面被覆の削れが発生
し、かつ、内面についても腐食が見られ、所望の容器と
はならなかった。 [00 28] using a material the inner and outer side is covered with a PET film of JIS 3004H39 aluminum alloy sheet of Comparative Example 3 Thickness 0.30 mm, aperture usual known the DI can manufacturing method, after redrawing, three stages of clearance I tried to make a container by the squeezing method. However, the outer surface coating was partially scraped and the inner surface was also corroded, so that the desired container was not obtained.
【００２９】比較例４
厚み０．２６mmのＪＩＳ ３００４Ｈ３９アルミニウム
合金板の両面をＰＥＴフイルムで被覆した材料を用い、
第一工程で通常の絞り加工のみ・第二工程で薄肉化を伴
う再絞り加工・第三工程で同時薄肉化絞りしごき加工
（しごきによる薄肉化分：５％）を施して容器を製作し
ようとした。しかし、肌粗れが著しく、それを起点とし
た破胴が生じ、所望の容器は得られなかった。表１と表
２に実施例と比較例の容器と性能を示す。 Comparative Example 4 Using a material in which both sides of a JIS 3004H39 aluminum alloy plate having a thickness of 0.26 mm are coated with PET film,
Attempting to manufacture a container by applying only normal drawing in the first step, redrawing with thinning in the second step, simultaneous thinning drawing and ironing processing in the third step (thinning thinning: 5%) did. However, the skin was so rough that a crushing process was initiated from that, and the desired container could not be obtained. Table 1 and Table
2 shows the containers and performances of Examples and Comparative Examples.
【００３０】003 0
【表１】 [Table 1]
【００３１】003 1
【表２】 [Table 2]
【００３２】[003 2 ]
【発明の効果】本発明のシームレスアルミニウム容器は
外面は平滑な金属光沢を有さず、パール顔料を施したよ
うな明るい外観を有し、印刷適性が優れており、内面は
耐腐蝕性が優れている。EFFECTS OF THE INVENTION The seamless aluminum container of the present invention does not have a smooth metallic luster on the outer surface, has a bright appearance like a pearl pigment, has excellent printability, and has an excellent corrosion resistance on the inner surface. ing.
【図面の簡単な説明】[Brief description of drawings]
【図１】Ｌ* ．ａ* ．ｂ* ．表色系立体説明図であ
る。FIG. 1 L * . a * . b * . It is a color system three-dimensional explanatory drawing.
【図２】Ｌ* ．ａ* ．ｂ* ．表色系色度図である。FIG. 2 L * . a * . b * . It is a colorimetric chromaticity diagram.
【符号の説明】 Ｌ* 明度 ａ* 赤−緑方向の色相と彩度 ｂ* 青−黄方向の色相と彩度[Explanation of symbols] L * Lightness a * Hue and saturation in red-green direction b * Hue and saturation in blue-yellow direction
───────────────────────────────────────────────────── フロントページの続き (72)発明者 本巣 郁美 神奈川県横浜市神奈川区西神奈川１−５− 10 (72)発明者 今津 勝宏 神奈川県横浜市泉区和泉町6205−１ Ｆターム(参考） 3E033 AA06 BA09 BA15 BA16 BA17 BA18 BA19 BA21 BA23 BA24 BA25 BB08 CA20 FA01 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Ikumi Motosu 1-5 Nishi-Kanagawa, Kanagawa-ku, Yokohama-shi, Kanagawa Ten (72) Inventor Katsuhiro Imazu 6205-1, Izumi-cho, Izumi-ku, Yokohama-shi, Kanagawa F-term (reference) 3E033 AA06 BA09 BA15 BA16 BA17 BA18 BA19 BA21 BA23 BA24 BA25 BB08 CA20 FA01
Claims (5)
て形成したシームレス容器において、容器の外面がＬ＊
ａ＊ ｂ＊ 表色系色度で表わして、明度Ｌ＊ 値
がＬ＊ ＞６０であり、色度のａ＊ 値およびｂ＊
値から次式を用いて計算される彩度ｃ＊ が ｃ＊ ＝（ａ＊２＋ｂ＊２）１／２ ＜５ の関係を満したシームレスアルミニウム容器。1. A seamless container formed using an aluminum plate coated with a synthetic resin, wherein the outer surface of the container is L *.
Expressed by a * b * color system chromaticity, lightness L * value is L * > 60, and a * value and b * of chromaticity are
A seamless aluminum container in which the saturation c * calculated from the value using the following formula satisfies the relationship of c * = (a * 2 + b * 2 ) 1/2 <5.
可塑性樹脂である、請求項１に記載されたシームレスア
ルミニウム容器。2. The seamless aluminum container according to claim 1, wherein the synthetic resin coating the aluminum plate is a thermoplastic resin.
面の高さ方向中央部で金属面を測定して得た値である、
請求項１または２に記載されたシームレスアルミニウム
容器。3. The lightness and saturation values of the outer surface of the container are values obtained by measuring a metal surface at the central portion in the height direction of the outer surface of the container body,
The seamless aluminum container according to claim 1 or 2.
射光除去方式により測定した反射率からＤ６５光源およ
び２°視野の条件により算出した値である、請求項１な
いし４のいずれか１項に記載された、シームレスアルミ
ニウム容器。4. The L * value, the a * value, and the b * value are values calculated from the reflectance measured by the specular reflection light removing method under the conditions of a D65 light source and a 2 ° visual field. The seamless aluminum container described in any one of items.
〜７０％である、請求項１ないし４のいずれか１項に記
載されたシームレスアルミニウム容器。5. The average thinning rate of the side wall of the final container is 20.
The seamless aluminum container according to any one of claims 1 to 4, which is ˜70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002259939A JP4051246B2 (en) | 2002-09-05 | 2002-09-05 | Seamless aluminum containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002259939A JP4051246B2 (en) | 2002-09-05 | 2002-09-05 | Seamless aluminum containers |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10060796A Division JP3440688B2 (en) | 1996-03-19 | 1996-03-19 | Two-piece seamless aluminum container and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003104349A true JP2003104349A (en) | 2003-04-09 |
| JP4051246B2 JP4051246B2 (en) | 2008-02-20 |
Family
ID=19196720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002259939A Expired - Fee Related JP4051246B2 (en) | 2002-09-05 | 2002-09-05 | Seamless aluminum containers |
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| Country | Link |
|---|---|
| JP (1) | JP4051246B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2014157425A1 (en) * | 2013-03-28 | 2017-02-16 | 日本ケミコン株式会社 | Electrolytic capacitor and manufacturing method thereof |
| WO2022190747A1 (en) * | 2021-03-08 | 2022-09-15 | 大和製罐株式会社 | Method for manufacturing bottle-type can made of colored-resin-coated metal plate |
-
2002
- 2002-09-05 JP JP2002259939A patent/JP4051246B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2014157425A1 (en) * | 2013-03-28 | 2017-02-16 | 日本ケミコン株式会社 | Electrolytic capacitor and manufacturing method thereof |
| WO2022190747A1 (en) * | 2021-03-08 | 2022-09-15 | 大和製罐株式会社 | Method for manufacturing bottle-type can made of colored-resin-coated metal plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4051246B2 (en) | 2008-02-20 |
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