JP3984527B2 - Method for producing laminated metal strip for paint cans with excellent formability - Google Patents
Method for producing laminated metal strip for paint cans with excellent formability Download PDFInfo
- Publication number
- JP3984527B2 JP3984527B2 JP2002306530A JP2002306530A JP3984527B2 JP 3984527 B2 JP3984527 B2 JP 3984527B2 JP 2002306530 A JP2002306530 A JP 2002306530A JP 2002306530 A JP2002306530 A JP 2002306530A JP 3984527 B2 JP3984527 B2 JP 3984527B2
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- Prior art keywords
- metal strip
- polyethylene
- producing
- coating
- excellent formability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、缶外面相当側にインナーワックスを含有する塗料を塗布され、かつ缶内面相当側にラミネートが施された缶用金属帯の製造方法に関するものである。
【0002】
【従来の技術】
従来、飲料容器においては低コスト量産が容易なことから、絞り加工やしごき加工缶が幅広く使用されている。これらの缶を製造する方法としては、一般に加工性確保の観点から錫めっき鋼板やアルミ板をその表面に潤滑剤を付与しつつ加工を行う方法が一般的である。外面錆防止と内面耐食性確保のためには、しごき成形後に塗装被覆する必要があるため、成形後に缶単位で潤滑剤をアルカリ等の洗剤で水洗除去、化成処理、塗装する低生産性の工程を経由せねばならないという問題があった。
【0003】
かかる缶工程の低生産性工程を省略し、生産性を改善する技術として、特許文献1に開示されたような表面にラミネートを施す方法や、加工前に予め缶外面相当面を樹脂系塗料で塗装するとともに缶内面相当面にラミネートを施すという方法が提唱されてきた。樹脂系塗料で塗布するに際しては、その後の加工時の加工性を確保するため、塗料中に潤滑剤としてインナーワックスを添加する場合がある。絞り加工やしごき加工は一般に多段加工であるが、このような場合、インナーワックスの潤滑効果が十分発揮できなかったり、発揮されたとしても1段目や2段目の初期段階で潤滑効果が消失してしまう場合があった。
【0004】
【引用文献】
(a)特許文献1(特開平10−46101号公報)
【0005】
【発明が解決しようとする課題】
本発明は、上記の従来技術の欠点を改善し、樹脂系塗料に添加されたインナーワックスの絞り加工やしごき加工の潤滑効果を十分に発揮させるような、缶内面相当面にラミネートを施された金属帯の製造方法を提供するものである。
【0006】
【課題を解決するための手段】
本発明者らは、上記の課題を解決するために、ラミネートを施す際の温度条件を制御することで、多段の絞り加工やしごき加工を行うに際して、優れた潤滑性が確保できることを知見し、本発明を完成した。
その要旨とするところは、
(1)缶用金属帯の缶外面相当側にインナーワックスとしてポリエチレン又はポリテトラフルエチレン(PTFE)又は酸化ポリエチレンを含有するポリエステル又はアクリルを主剤とする塗料を塗布し乾燥した金属帯の缶内面相当側に熱可塑性樹脂としてポリエチレンテレフタレート、又はエチレンテレフタレート−イソフタレート共重合体、又はポリプロピレン、又はポリエチレンをラミネートするに際し、ラミネート工程及びそれ以降の後処理工程における金属帯の最高到達温度を300℃以下とすることを特徴とする成形性に優れた塗装缶用ラミネート金属帯の製造方法。
【0007】
(2)缶用金属帯の缶外面相当側にインナーワックスとしてポリエチレン又はポリテトラフルエチレン(PTFE)又は酸化ポリエチレンを含有し、塗装乾燥質量比で10%以上の金属フィラーとを含有するポリエステル又はアクリルを主剤とする塗料を塗布し乾燥した金属帯の缶内面相当側に熱可塑性樹脂としてポリエチレンテレフタレート、又はエチレンテレフタレート−イソフタレート共重合体、又はポリプロピレン、又はポリエチレンをラミネートするに際し、ラミネート工程及びそれ以降の後処理工程における金属帯の最高到達温度を300℃以下とすることを特徴とする成形性に優れた塗装缶用ラミネート金属帯の製造方法。
(3)金属フィラーがアルミニウムまたはアルミニウム合金であることを特徴とする前記(2)記載の成形性に優れた塗装缶用ラミネート金属帯の製造方法。
(4)金属帯がアルミニウムまたはアルミニウム合金であることを特徴とする前記(1)記載の成形性に優れた塗装缶用金属帯の製造方法にある。
【0008】
【発明の実施の形態】
以下、本発明について、しごき加工の場合を例として説明する。
まず、本発明の金属帯について説明する。図1は、本発明に係わる金属帯の表面断面構造を示す図である。
図1に示すように母材1となる金属帯の缶外面相当側片面上の塗膜2中にインナーワックス4を含んでおり、該インナーワックスは表層のみに存在するのではなく、塗膜内部にも存在することが重要であり、缶内面相当側の他の片面には熱可塑性樹脂皮膜3を有するものである。
【0009】
また、本発明に係わる金属帯上の塗膜中にはインナーワックスとは別に金属フィラーを含むことが好ましい。金属フィラーは外観を変える顔料としての役割の他に、しごき成型において、塗膜の硬度を保ち、カジリを防止する効果がある。金属フィラーの量は10mass%以上が好ましい。金属フィラー5を含む場合の表面断面構造の代表例を図2に示す。
【0010】
次に、製造条件について説明する。
樹脂は、溶剤(例えばメチルエチルケトン(以下、MEKとする)に溶かされ、該溶液中にインナーワックスが分散された状態で金属帯に塗布され乾燥される。その後にラミネートされるが、ラミネート温度が300℃を超えると、その後のしごき加工時の潤滑効果がしごき加工の前段が終了した時点で喪失してしまう。その理由は定かではないが、ラミネート温度が300℃を超えるとインナーワックスの大部分が樹脂の表面に移動してしまうためではないかと推定している。
【0011】
上記の潤滑効果の劣化は、ラミネート以降、しごき加工前の後処理工程の温度が300℃を超えた場合も同様に起きる。上記の温度は、望ましくは、280℃以下である。塗料中に、金属フィラー例えばアルミあるいはアルミ合金フィラーを含有させて、金属帯の缶外面の色調等を制御する場合があるが、その場合には、本発明の効果は特に顕著に発揮される。
【0012】
また、金属帯がアルミニウム、アルミニウム合金である場合には、母材が軟質であるため、金属フィラーを混入しなくとも、缶用金属帯の缶外面相当側にインナーワックスを含有する塗料を塗布し乾燥した金属帯の缶内面相当側にラミネートを施すに際し、ラミネート工程及びそれ以降の後処理工程における金属帯の最高到達温度を300℃以下とすることにより、缶外面相当側の塗装膜内のインナーワックスを塗膜厚方向に分散させて存在させることが出来、従い、同一表面に対し、しごき加工を複数回実施した場合にも、各々のしごき加工時に適切にワックス効果を維持することが可能となり、例えば二段目以降のしごき段階でインナーワックス効果が喪失するということが起こりにくくなる。
【0013】
この理由も定かではないが、フィラーによって、インナーワックスがトラップされて、樹脂層中に望ましい状態で存在するためではないかと推定している。その場合の効果は、上記のごとく10mass%以上で顕著であり、10mass%以上とするのが好ましい。上限値は、所定の塗膜強度を確保するという観点から90%以下が望ましい。
【0014】
【実施例】
表3に示す金属帯の缶外面相当面に表1に示す塗料を塗布し、缶内面相当面に表2に示す熱可塑性樹脂を表3に示す条件(温度)でラミネートした。そのときのしごき成形性を表3に示す。本発明の条件においては、優れたしごき成形性を得ることができた。
【0015】
【表1】
【0016】
【表2】
【0017】
【表3】
【0018】
【発明の効果】
以上述べたように、本発明によると、樹脂系塗料に添加されたインナーワックスの絞り加工やしごき加工時における潤滑効果を十分に発揮させることができ、その工業的意義は極めて大きい。
【図面の簡単な説明】
【図1】本発明の方法により製造された金属帯の断面を示す図である。
【図2】塗膜中に金属フィラーを含有する場合の、本発明の方法により製造された金属帯の断面を示す図である。
【符号の説明】
1 母材
2 塗膜
3 熱可塑性樹脂被膜
4 インナーワックス
5 金属フィラー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a metal strip for cans, in which a coating containing an inner wax is applied to the outer surface corresponding to the can and a laminate is applied to the inner surface corresponding to the can.
[0002]
[Prior art]
Conventionally, since a low-cost mass production is easy in a beverage container, drawing processing and ironing cans are widely used. As a method for producing these cans, generally, from the viewpoint of ensuring workability, a method of processing a tin-plated steel plate or an aluminum plate while applying a lubricant to the surface is generally used. In order to prevent external rust and ensure internal corrosion resistance, it is necessary to coat and coat after ironing molding, so the low-productivity process in which the lubricant is washed with water with a detergent such as alkali after molding, is subjected to low-productivity processes. There was a problem of having to go through.
[0003]
As a technique for improving the productivity by omitting the low productivity process of the can process, a method of laminating the surface as disclosed in
[0004]
[Cited document]
(A) Patent Document 1 (Japanese Patent Laid-Open No. 10-46101)
[0005]
[Problems to be solved by the invention]
The present invention improves the above-mentioned drawbacks of the prior art, and a laminate is applied to the inner surface corresponding to the inner surface of the can so as to sufficiently exhibit the lubricating effect of the drawing and ironing of the inner wax added to the resin-based paint. A method for producing a metal strip is provided.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors have found that by controlling the temperature conditions when applying a laminate, when performing multistage drawing and ironing, excellent lubricity can be secured, The present invention has been completed.
The gist is that
(1) Equivalent to the inner surface of a metal strip that has been dried by applying a coating mainly containing polyester or acrylic containing polyethylene, polytetrafluoroethylene (PTFE) or polyethylene oxide as an inner wax on the side corresponding to the outer surface of the metal strip for cans When laminating polyethylene terephthalate, ethylene terephthalate-isophthalate copolymer, polypropylene, or polyethylene as a thermoplastic resin on the side, the maximum temperature of the metal strip in the laminating step and the subsequent post-processing step is 300 ° C. or less. A method for producing a laminated metal strip for a paint can having excellent formability.
[0007]
(2) Polyester or acrylic containing polyethylene or polytetrafluoroethylene (PTFE) or polyethylene oxide as the inner wax on the side corresponding to the outer surface of the can metal band, and containing 10% or more metal filler by coating dry mass ratio When laminating polyethylene terephthalate, or ethylene terephthalate-isophthalate copolymer, or polypropylene, or polyethylene as a thermoplastic resin on the side corresponding to the inner surface of the can of the metal strip that has been coated and dried with the main component of A method for producing a laminated metal strip for a coating can excellent in formability, characterized in that a maximum temperature of the metal strip in a post-treatment step is 300 ° C. or lower.
(3) The method for producing a laminated metal strip for a coating can as described in (2) above, wherein the metal filler is aluminum or an aluminum alloy.
(4) The method for producing a metal strip for a coating can having excellent formability according to (1), wherein the metal strip is aluminum or an aluminum alloy.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described by taking the case of ironing as an example.
First, the metal strip of the present invention will be described. FIG. 1 is a diagram showing a surface cross-sectional structure of a metal strip according to the present invention.
As shown in FIG. 1, an
[0009]
Moreover, it is preferable that a metal filler is included in the coating film on the metal strip according to the present invention in addition to the inner wax. In addition to the role as a pigment that changes the appearance, the metal filler has an effect of maintaining the hardness of the coating film and preventing galling in ironing molding. The amount of the metal filler is preferably 10 mass% or more. A representative example of the surface cross-sectional structure when the
[0010]
Next, manufacturing conditions will be described.
Resins, solvents (such as methyl ethyl ketone (hereinafter, dissolved in the MEK), the inner wax in the solution is applied to the metal strip in a state of being dispersed dry. While then be laminated to a laminate temperature of 300 If the temperature exceeds ℃, the lubricating effect during the subsequent ironing process will be lost when the previous stage of the ironing process is completed, but the reason is not clear, but if the lamination temperature exceeds 300 ° C, most of the inner wax will be lost. It is presumed that it may move to the surface of the resin.
[0011]
The above-described deterioration of the lubrication effect occurs in the same manner when the temperature of the post-treatment process before the ironing process exceeds 300 ° C. after lamination. The above temperature is desirably 280 ° C. or lower. In some cases, the paint may contain a metal filler such as aluminum or an aluminum alloy filler to control the color tone of the outer surface of the can of the metal strip. In that case, the effect of the present invention is particularly remarkably exhibited.
[0012]
In addition, when the metal strip is aluminum or aluminum alloy, the base material is soft, so a paint containing an inner wax is applied to the side corresponding to the outer surface of the can metal strip without mixing the metal filler. When laminating the dried metal strip on the side corresponding to the inner surface of the can, the inner temperature in the coating film on the side corresponding to the outer surface of the can is reduced by setting the maximum temperature of the metal strip in the laminating step and the subsequent post-processing step to 300 ° C. or less. It is possible to disperse the wax in the thickness direction of the coating film, and accordingly, even if the ironing process is performed several times on the same surface, it is possible to maintain the wax effect appropriately during each ironing process. For example, the loss of the inner wax effect is less likely to occur at the ironing stage after the second stage.
[0013]
The reason for this is not clear, but it is estimated that the inner wax is trapped by the filler and exists in a desired state in the resin layer. The effect in that case is remarkable at 10 mass% or more as described above, and is preferably at least 10 mass%. The upper limit is desirably 90% or less from the viewpoint of ensuring a predetermined coating film strength.
[0014]
【Example】
The paint shown in Table 1 was applied to the surface corresponding to the outer surface of the metal strip shown in Table 3, and the thermoplastic resin shown in Table 2 was laminated on the surface corresponding to the inner surface of the can under the conditions (temperature) shown in Table 3. Table 3 shows the ironing moldability at that time. Under the conditions of the present invention, excellent ironing moldability could be obtained.
[0015]
[Table 1]
[0016]
[Table 2]
[0017]
[Table 3]
[0018]
【The invention's effect】
As described above, according to the present invention, the lubrication effect at the time of drawing or ironing of the inner wax added to the resin-based paint can be sufficiently exerted, and its industrial significance is extremely great.
[Brief description of the drawings]
FIG. 1 is a view showing a cross section of a metal strip manufactured by the method of the present invention.
FIG. 2 is a view showing a cross section of a metal strip produced by the method of the present invention when a metal filler is contained in a coating film.
[Explanation of symbols]
1
Claims (4)
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JP2002306530A JP3984527B2 (en) | 2002-09-12 | 2002-10-22 | Method for producing laminated metal strip for paint cans with excellent formability |
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JP2002266262 | 2002-09-12 | ||
JP2002306530A JP3984527B2 (en) | 2002-09-12 | 2002-10-22 | Method for producing laminated metal strip for paint cans with excellent formability |
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JP2004154939A JP2004154939A (en) | 2004-06-03 |
JP3984527B2 true JP3984527B2 (en) | 2007-10-03 |
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JP2002306530A Expired - Fee Related JP3984527B2 (en) | 2002-09-12 | 2002-10-22 | Method for producing laminated metal strip for paint cans with excellent formability |
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