JPH0144406B2 - - Google Patents
Info
- Publication number
- JPH0144406B2 JPH0144406B2 JP60132698A JP13269885A JPH0144406B2 JP H0144406 B2 JPH0144406 B2 JP H0144406B2 JP 60132698 A JP60132698 A JP 60132698A JP 13269885 A JP13269885 A JP 13269885A JP H0144406 B2 JPH0144406 B2 JP H0144406B2
- Authority
- JP
- Japan
- Prior art keywords
- cap seal
- aluminum
- punch
- forming
- aluminum foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- 239000011888 foil Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 239000002648 laminated material Substances 0.000 claims description 11
- 229920003002 synthetic resin Polymers 0.000 claims description 8
- 239000000057 synthetic resin Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000037303 wrinkles Effects 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Landscapes
- Closures For Containers (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
産業上の利用分野
この発明はアルミニウムラミネート材のキヤツ
プシール成形方法、特に絞り成形後のキヤツプシ
ールの弾性変形（いわゆるスプリングバツク）を
軽減するための成形方法に関する。
なおこの明細書において、アルミニウムの語は
アルミニウム合金を含む意味において用いる。
従来の技術
飲食容器などのキヤツプシール用素材として
は、従来より、1N30合金等を焼鈍した軟質状態
の箔（いわゆるＯ材）が用いられていたが、かか
る軟質箔は強度的に弱いため、箔厚を概ね30〜
100μｍ程度の比較的厚いものにせざるを得ず、
昨今のコストダウンの要求に対処できなくなつて
きた。
そこで最近では、アルミニウム箔自体を薄肉化
してコスト低減を図るとともに該箔の薄肉化に伴
う強度低下を補うキヤツプシール用素材として、
アルミニウム箔に合成樹脂フイルムを積層貼合し
たアルミニウムラミネート材が用いられるように
なつてきている。
発明が解決しようとする問題点
しかしながら、このようなアルミニウムラミネ
ート材では、合成樹脂フイルムの弾性係数が低い
ため、絞り成形後におけるラミネート材のスプリ
ングバツクが概して大きくなり、甚しくは絞りポ
ンチの形状と異なつたものとなつて、次工程にお
ける処理上問題を生ずるおそれがあるというよう
な欠点を派生するものであつた。
この発明はかかる事情に鑑みてなされたもので
あつて、絞り成形後のキヤツプシールのスプリン
グバツクを軽減することを目的とするものであ
る。
問題点を解決するための手段
この目的を達成するために、発明者は種々実験
と研究を重ねた結果、絞り成形時の絞り条件を一
定範囲のものとすることにより、スプリングバツ
クの抑制が可能であることを知るに至り、かかる
知見に基いてこの発明を完成し得たものである。
すなわちこの発明は、アルミニウム箔の少なく
とも片面に合成樹脂フイルムを積層貼合してなる
アルミニウムラミネート材を、絞り比（ブランク
径／ポンチ径）：1.3〜2.0、しわ押え圧力：0.5〜
8.0Kgｆ／cm2、ポンチとダイのクリアランス：材
料厚さの1.0〜2.5倍の条件のもとで絞り成形して
キヤツプシールとなすことを特徴とするアルミニ
ウムラミネート材のキヤツプシール成形方法を要
旨とするものである。
ラミネート材を形成するアルミニウム箔として
は、一般に1N30合金等の純アルミニウム系合金
をＯ材処理した軟質箔が用いられるが、これらに
限定されるものではない。またアルミニウム箔の
厚さは、コスト低減効果の点から25μｍ以下とす
るのが望ましい。
アルミニウム箔と貼合される合成樹脂フイルム
の一例としてはポリプロピレン（PP）、ポリエス
テル（PET）、ポリエチレン（PE）、ナイロン等
の各フイルムをあげうる。合成樹脂フイルムはア
ルミニウム箔の片面のみに貼合されても、両面に
貼合されても良く、また両面に貼合された場合に
は片面毎にフイルムの種類を変えても良く、ある
いはさらにフイルムの上に同種、異種のフイルム
を複数層に積層したものであつても良い。
このようなアルミニウムラミネート材を用いて
キヤツプシールを製作する場合、通常該ラミネー
ト材をキヤツプシール形状への打抜き工程に付し
たのち、打抜き片をブランクとして浅絞り成形す
るものとなされるが、この発明では、絞り成形
を、絞り比（ブランク径／ポンチ径）：1.3〜2.0
望ましくは1.3〜1.6、しわ押え圧力：0.5〜8.0Kg
ｆ／cm2、ポンチとダイのクリアランス：材料厚さ
の1.0〜2.5倍の条件のもとで施すものとする。こ
れらの要素は絞り成形時のキヤツプシール側壁部
の塑性変形量に影響を及ぼすものであり、塑性変
形量が少ないと成形後のスプリングバツクが大き
く、逆に塑性変形量が大きいとアルミニウム箔が
破断する。具体的には、絞り比が2.0を超えた場
合、しわ押え圧力が8.0Kgｆ／cm3を超えた場合、
あるいはポンチとダイのクリアランスが素材厚さ
の1.0倍未満の場合に破断が生じやすくなる。な
お絞り比が2.0を超えた場合には材料コスト上昇
の欠点をも派生する。一方、絞り比が1.3未満、
しわ押え圧力が0.5Kgｆ／cm2未満、ポンチとダイ
のクリアランスが材料厚さの2.5倍を超えた場合
には、成形後キヤツプシールの側壁部が全体に末
広がり状を呈してスプリングバツクが大きくなる
とともに、側壁部のしわが粗になり外観体裁を損
う。このため上記の範囲に限定したのである。な
おポンチコーナーの曲率半径（Ｒ）については特
に限定されるものではないが、2.0mm以下とする
のが望ましい。（Ｒ）が2.0mmを超えると成形時に
ポンチコーナーとブランクとが密着せず隙間を生
じる虞れがあるからである。
発明の効果
この発明によれば、絞り条件を一定範囲に限定
して絞り成形を行うものとしたことにより、実施
例の参酌によつても明らかなように、スプリング
バツクが少なく、次工程の処理上においても品質
上においても全く問題のないキヤツプシールを得
ることができる。
実施例
次にこの発明の実施例を比較例との対比におい
て示す。
実施例 １
1N30合金をＯ材処理してなる厚さ20μｍのアル
ミニウム軟質箔の片面に、厚さ6μｍのポリエス
テルフイルムを積層貼合してなるアルミニウムラ
ミネート材を種々の大きさに打抜いたのち、打抜
き片をブランクとして直径32mmのポンチを用いて
第１表に示す種々の絞り条件のもとで絞り成形
し、キヤツプシールを作製した。そして各キヤツ
プシールのスプリングバツク量を調べた。なおス
プリングバツク量は成形後のキヤツプシールの最
大径とポンチ径との差で評価した。その結果を第
１表に示す。
INDUSTRIAL APPLICATION FIELD This invention relates to a method for forming a cap seal of an aluminum laminate material, and particularly to a method for reducing elastic deformation (so-called spring back) of a cap seal after drawing. In this specification, the term aluminum is used to include aluminum alloys. Conventional technology Conventionally, soft foil (so-called O material) made by annealing 1N30 alloy has been used as a material for cap seals of food and drink containers, etc.; The thickness is approximately 30~
It had to be relatively thick, about 100μm,
It has become impossible to meet the recent demands for cost reduction. Therefore, recently, aluminum foil itself has been made thinner to reduce costs, and as a material for cap seals, it has been used to compensate for the decrease in strength due to the thinner aluminum foil.
Aluminum laminate materials, which are made by laminating and bonding a synthetic resin film to aluminum foil, have come into use. Problems to be Solved by the Invention However, in such aluminum laminate materials, since the elastic modulus of the synthetic resin film is low, the spring back of the laminate material after drawing is generally large, and the shape of the drawing punch is even worse. This resulted in drawbacks such as the possibility that the process would become different and cause processing problems in the next process. The present invention was made in view of the above circumstances, and it is an object of the present invention to reduce the spring back of a cap seal after drawing. Means for solving the problem In order to achieve this objective, the inventor conducted various experiments and research, and found that by setting the drawing conditions during drawing to a certain range, it was possible to suppress springback. This invention was completed based on this knowledge. That is, this invention uses an aluminum laminate material made by laminating a synthetic resin film on at least one side of an aluminum foil, with a drawing ratio (blank diameter/punch diameter) of 1.3 to 2.0 and a wrinkle pressing pressure of 0.5 to 2.0.
8.0Kgf/cm 2 , clearance between punch and die: 1.0 to 2.5 times the thickness of the material.The outline of this article is a cap seal forming method for aluminum laminate material, which is formed into a cap seal by drawing under conditions of 1.0 to 2.5 times the material thickness. It is something to do. As the aluminum foil forming the laminate material, a soft foil obtained by treating pure aluminum alloy such as 1N30 alloy with O material is generally used, but the foil is not limited to these. Further, the thickness of the aluminum foil is desirably 25 μm or less from the viewpoint of cost reduction effect. Examples of synthetic resin films to be laminated with aluminum foil include films of polypropylene (PP), polyester (PET), polyethylene (PE), nylon, and the like. The synthetic resin film may be attached to only one side of the aluminum foil, or it may be attached to both sides, and if it is attached to both sides, the type of film may be changed for each side, or the film may be attached to both sides. A plurality of films of the same type or different types may be laminated thereon. When manufacturing a cap seal using such an aluminum laminate material, the laminate material is usually subjected to a punching process into a cap seal shape, and then shallow drawing is performed using the punched piece as a blank. Now, draw forming with drawing ratio (blank diameter/punch diameter): 1.3 to 2.0.
Preferably 1.3-1.6, wrinkle press pressure: 0.5-8.0Kg
f/cm 2 , clearance between punch and die: 1.0 to 2.5 times the material thickness. These factors affect the amount of plastic deformation of the side wall of the cap seal during drawing forming, and if the amount of plastic deformation is small, the spring back after forming will be large, and conversely, if the amount of plastic deformation is large, the aluminum foil will break. do. Specifically, when the aperture ratio exceeds 2.0, when the wrinkle press pressure exceeds 8.0Kgf/ cm3 ,
Alternatively, if the clearance between the punch and die is less than 1.0 times the material thickness, breakage is likely to occur. Note that if the drawing ratio exceeds 2.0, there is also the disadvantage of increased material costs. On the other hand, if the aperture ratio is less than 1.3,
If the wrinkle presser pressure is less than 0.5Kgf/ cm2 and the clearance between the punch and die exceeds 2.5 times the material thickness, the side wall of the cap seal will become wider after molding and the spring back will increase. At the same time, the wrinkles on the side wall portion become coarse, spoiling the appearance. For this reason, it was limited to the above range. The radius of curvature (R) of the punch corner is not particularly limited, but is preferably 2.0 mm or less. This is because if (R) exceeds 2.0 mm, there is a risk that the punch corner and the blank will not come into close contact with each other during molding, resulting in a gap. Effects of the Invention According to the present invention, since drawing conditions are limited to a certain range and drawing forming is performed, as is clear from consideration of Examples, there is less spring back, and processing in the next step is reduced. It is possible to obtain a cap seal that has no problems in terms of appearance and quality. Examples Next, examples of the present invention will be shown in comparison with comparative examples. Example 1 Aluminum laminates made by laminating a 6 μm thick polyester film on one side of a 20 μm thick soft aluminum foil made by treating 1N30 alloy with O material were punched into various sizes. The punched pieces were used as blanks and drawn using a punch with a diameter of 32 mm under various drawing conditions shown in Table 1 to produce cap seals. The spring back amount of each cap seal was then investigated. The springback amount was evaluated based on the difference between the maximum diameter of the cap seal after molding and the punch diameter. The results are shown in Table 1.
【表】
実施例 ２
合成樹脂フイルムを厚さ5μｍのポリプロピレ
ン延伸フイルム（OPP）とした以外は実施例１
と同じ条件でキヤツプシールを作製し、同様にス
プリングバツク量を調べた。その結果を第２表に
示す。[Table] Example 2 Example 1 except that the synthetic resin film was a 5 μm thick stretched polypropylene film (OPP)
A cap seal was prepared under the same conditions as above, and the amount of spring back was examined in the same manner. The results are shown in Table 2.
【表】
実施例 ３
合成樹脂フイルムを厚さ12μｍのポリプロピレ
ン延伸フイルム（OPP）とし、絞り条件を第３
表に設定した以外は実施例１と同じ条件でキヤツ
プシールを作製し、同様にスプリングバツク量を
調べた。その結果を第３表に示す。[Table] Example 3 The synthetic resin film was a stretched polypropylene film (OPP) with a thickness of 12 μm, and the drawing conditions were
A cap seal was produced under the same conditions as in Example 1 except as set in the table, and the amount of spring back was examined in the same manner. The results are shown in Table 3.
【表】
上記結果から明らかなように、この発明によれ
ば、キヤツプシールのスプリングバツクを軽減し
うることを確認しえた。[Table] As is clear from the above results, it was confirmed that according to the present invention, the spring back of the cap seal could be reduced.
Claims (1)
フイルムを積層貼合してなるアルミニウムラミネ
ート材を、絞り比：1.3〜2.0、しわ押え圧力：0.5
〜8.0Kgｆ／cm2、ポンチとダイのクリアランス：
材料厚さの1.0〜2.5倍の条件のもとで絞り成形し
てキヤツプシールとなすことを特徴とするアルミ
ニウムラミネート材のキヤツプシール成形方法。1. An aluminum laminate material made by laminating a synthetic resin film on at least one side of aluminum foil, drawing ratio: 1.3 to 2.0, wrinkle pressing pressure: 0.5
~8.0Kgf/cm 2 , Clearance between punch and die:
A method for forming a cap seal of aluminum laminate material, characterized by forming a cap seal by drawing under conditions of 1.0 to 2.5 times the thickness of the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60132698A JPS61290030A (en) | 1985-06-17 | 1985-06-17 | Molding method of cap seal of aluminum laminate material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60132698A JPS61290030A (en) | 1985-06-17 | 1985-06-17 | Molding method of cap seal of aluminum laminate material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61290030A JPS61290030A (en) | 1986-12-20 |
| JPH0144406B2 true JPH0144406B2 (en) | 1989-09-27 |
Family
ID=15087457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60132698A Granted JPS61290030A (en) | 1985-06-17 | 1985-06-17 | Molding method of cap seal of aluminum laminate material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61290030A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005046967A1 (en) * | 2003-11-13 | 2005-05-26 | Shikoku Kakoki Co., Ltd. | Cover forming device and resin cover forming method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5101906B2 (en) * | 2007-03-06 | 2012-12-19 | 昭和電工パッケージング株式会社 | Battery case molding method and molding apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5142688A (en) * | 1974-10-09 | 1976-04-10 | Yoshizaki Kozo | |
| JPS606783A (en) * | 1983-06-25 | 1985-01-14 | Kasei Optonix Co Ltd | Phosphate phosphor and its preparation |
-
1985
- 1985-06-17 JP JP60132698A patent/JPS61290030A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5142688A (en) * | 1974-10-09 | 1976-04-10 | Yoshizaki Kozo | |
| JPS606783A (en) * | 1983-06-25 | 1985-01-14 | Kasei Optonix Co Ltd | Phosphate phosphor and its preparation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005046967A1 (en) * | 2003-11-13 | 2005-05-26 | Shikoku Kakoki Co., Ltd. | Cover forming device and resin cover forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61290030A (en) | 1986-12-20 |
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