JP5653241B2 - Pre-painting method and coating method for metal surface - Google Patents
Pre-painting method and coating method for metal surface Download PDFInfo
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- JP5653241B2 JP5653241B2 JP2011025410A JP2011025410A JP5653241B2 JP 5653241 B2 JP5653241 B2 JP 5653241B2 JP 2011025410 A JP2011025410 A JP 2011025410A JP 2011025410 A JP2011025410 A JP 2011025410A JP 5653241 B2 JP5653241 B2 JP 5653241B2
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- 229910052751 metal Inorganic materials 0.000 title claims description 96
- 239000002184 metal Substances 0.000 title claims description 96
- 238000000576 coating method Methods 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 31
- 238000010422 painting Methods 0.000 title claims description 9
- 239000000853 adhesive Substances 0.000 claims description 49
- 230000001070 adhesive effect Effects 0.000 claims description 49
- 230000001681 protective effect Effects 0.000 claims description 36
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000004140 cleaning Methods 0.000 claims description 5
- 208000028659 discharge Diseases 0.000 description 31
- 239000003973 paint Substances 0.000 description 29
- 238000003851 corona treatment Methods 0.000 description 27
- 239000007788 liquid Substances 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 13
- 229910001220 stainless steel Inorganic materials 0.000 description 13
- 238000005406 washing Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000037303 wrinkles Effects 0.000 description 10
- 230000001153 anti-wrinkle effect Effects 0.000 description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001846 repelling effect Effects 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000037330 wrinkle prevention Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Application Of Or Painting With Fluid Materials (AREA)
Description
本発明は、金属体表面の塗装前処理方法及び塗装方法に関し、より詳しくは、表面保護フィルムが剥がされた金属体表面から糊残り又はその悪影響をコロナ放電を用いて除去する工程を有する各方法に関する。 The present invention relates to a painting pretreatment method and coating method of the gold Shokutai surface, more specifically, a step of removing by using a corona discharge adhesive residue or a negative effect from the surface protective film is peeled metal surface Regarding each method.
金属体表面を覆って保護する表面保護フィルムを剥がしたとき、表面保護フィルムの粘着力の原因物質が金属体表面に残る現象、いわゆる糊残りが起こると、引き続く塗装などの表面処理に支障を来す。それ故、糊残りが起こりにくい表面保護フィルムの開発が進められている（例えば特許文献１、特許文献２参照）。 When the surface protective film that covers and protects the surface of the metal body is peeled off, the phenomenon that causes the adhesive force of the surface protective film to remain on the surface of the metal body, that is, the so-called adhesive residue, hinders subsequent surface treatment such as painting. The Therefore, development of a surface protective film in which adhesive residue hardly occurs is being promoted (see, for example, Patent Document 1 and Patent Document 2).
しかし、糊残りが生じにくい表面保護フィルムで覆って金属体表面を保護しても、現実には糊残りは起こる。例えば金属体の運搬、保管、出し入れ、展示、加工その他の流通過程や加工過程においては、金属体同士が擦れ合う、金属体に他の物体が押し当てられる、金属体に他の物体が衝突するなどの出来事や作業工程があるので、表面保護フィルムが金属体表面に強く、局所的に押し付けられ、表面保護フィルムの粘着物が金属体表面に強く付着し、表面保護フィルムを剥がした後の金属体表面に糊残りが生じる場合が多い。表面保護フィルムを剥離した後の金属体表面に塗料（例えば無機塗料や水性塗料）を塗布するとその塗料がはじかれて馴染まない箇所が顕著に現れるので、当該金属体表面に糊残りが多いことは容易に確認できる。 However, even if the surface of the metal body is protected by covering with a surface protective film that hardly causes adhesive residue, adhesive residue actually occurs. For example, in the transportation, storage, taking in and out, display, processing and other distribution processes and processing processes of metal bodies, the metal bodies rub against each other, other objects are pressed against the metal bodies, and other objects collide with the metal bodies. Since the surface protective film is strong and locally pressed against the surface of the metal body, the adherent of the surface protective film strongly adheres to the surface of the metal body and the surface protective film is peeled off. In many cases, adhesive residue is left on the surface. When a paint (for example, inorganic paint or water-based paint) is applied to the surface of the metal body after the surface protective film has been peeled off, there will be noticeable places where the paint will be repelled and unfamiliar with it. Easy to confirm.
糊残りが生じにくい表面保護フィルムで金属体表面を覆っていても糊残りが生じるのであれば、それを十分に除去できない限り、引き続く塗装などの表面処理に支障を来す。糊残りが生じやすい表面保護フィルムで金属体表面を覆っている場合であれば尚更である。 Even if the surface of the metal body is covered with a surface protective film that hardly causes adhesive residue, if adhesive residue is generated, the surface treatment such as subsequent coating is hindered unless it can be removed sufficiently. This is especially true when the surface of the metal body is covered with a surface protective film that is likely to cause adhesive residue.
また、表面処理に支障を来す糊残りは必ずしも目視できるとは限らない。目視できない糊残りが金属体表面に生じる可能性を否定できないのであれば、糊残りの徹底除去を試みることにより、その発生の可能性を極力小さくするほかない。 Moreover, the adhesive residue which interferes with surface treatment is not necessarily visible. If it cannot be denied that there is a possibility that an adhesive residue that cannot be visually observed is generated on the surface of the metal body, the possibility of the occurrence of the adhesive residue can be reduced as much as possible by trying to remove the adhesive residue thoroughly.
そのような事情から、現実には、糊残りが生じにくい表面保護フィルムの採否に拘わらず、表面保護フィルムが剥がされた金属体表面をアルカリ性溶剤のような洗浄液を用いて洗浄し、糊残りの除去を徹底して行う場合が多い。 Under such circumstances, in practice, the surface of the metal body from which the surface protective film has been peeled off is washed using a cleaning liquid such as an alkaline solvent, regardless of whether or not the surface protective film is less likely to cause adhesive residue. In many cases, thorough removal is performed.
しかし、表面保護フィルムが剥がされた金属体表面を洗浄液により洗浄して糊残りの除去を行うためには、同時に、金属体表面から残留洗浄液を除去するための洗浄、引き続く金属体表面の乾燥、洗浄液の維持、回収、管理などが付帯的に必要になり、装置や設備のコストの点で高額になりがちである。 However, in order to remove the adhesive residue by washing the surface of the metal body from which the surface protective film has been peeled off with the washing liquid, at the same time, washing for removing the residual washing liquid from the surface of the metal body, subsequent drying of the surface of the metal body, Maintenance, recovery, and management of the cleaning liquid are incidentally necessary, and the cost of the apparatus and equipment tends to be high.
本発明は、以上の問題に鑑みてなされたものであり、表面保護フィルムが剥がされた金属体表面からの糊残りの除去を比較的簡単に又は低コストで達成することができる技術を提供することを目的とする。 This invention is made | formed in view of the above problem, and provides the technique which can achieve the removal of the adhesive residue from the metal body surface from which the surface protection film was peeled off comparatively easily or at low cost. For the purpose.
本発明の第１の形態に係る金属体表面の塗装前処理方法は、表面保護フィルムが貼られている金属体を用意する工程と、用意された金属体の表面から表面保護フィルムを剥がす工程と、表面保護フィルムが剥がされた金属体の表面に塗装を施す前に表面保護フィルムの粘着物に由来する糊残りをその表面から除去する糊残り除去工程とを有し、当該糊残り除去工程は、表面保護フィルムを剥がした後の金属体の表面を、洗浄することなく、コロナ放電が発生している環境に晒す工程を有することを特徴とするものである。 The pre-painting method for the surface of a metal body according to the first embodiment of the present invention includes a step of preparing a metal body to which a surface protective film is attached, a step of peeling the surface protective film from the surface of the prepared metal body, A paste residue removing step for removing the adhesive residue derived from the adhesive of the surface protective film from the surface before coating the surface of the metal body from which the surface protective film has been peeled off. The method further comprises a step of exposing the surface of the metal body after the surface protective film is peeled off to an environment in which corona discharge occurs without washing.
本発明の第２の形態に係る金属体表面の塗装方法は、表面保護フィルムが貼られている金属体を用意する工程と、用意された金属体の表面から表面保護フィルムを剥がす工程と、表面保護フィルムを剥がした後の金属体の表面を、洗浄することなく、コロナ放電が発生している環境に晒し、これにより表面保護フィルムの粘着物に由来する糊残りを除去する工程と、前記環境に晒された後の金属体の表面を塗装する工程と、を有することを特徴とするものである。 The metal body surface coating method according to the second embodiment of the present invention includes a step of preparing a metal body to which a surface protection film is applied, a step of peeling the surface protection film from the surface of the prepared metal body, and a surface. Exposing the surface of the metal body after peeling off the protective film to an environment where corona discharge is generated without washing, thereby removing the adhesive residue derived from the adhesive on the surface protective film , and the environment And a step of coating the surface of the metal body after being exposed to.
なお、本発明において、次に掲げる用語の意味又は解釈は以下のとおりである。
「糊残り」とは、糊残り又はその塗装その他の表面処理への悪影響をいう。
「金属体」とは金属製の物品をいい、コロナ放電による処理が可能である限り、その材質に特に制限はない。その「金属」の典型例は、ステンレス鋼、チタニウム又はその合金、アルミニウム又はその合金である。In the present invention, the meanings or interpretations of the following terms are as follows.
“Adhesive residue” refers to an adverse effect on adhesive residue or its coating or other surface treatment.
The “metal body” means a metal article, and the material is not particularly limited as long as it can be processed by corona discharge. Typical examples of the “metal” are stainless steel, titanium or an alloy thereof, aluminum or an alloy thereof.
「表面保護フィルム」とは、金属体表面に貼られたとき、その金属体表面を覆って保護し、剥がされたとき、その金属体表面に糊残りを生じさせる（換言すれば、その金属体表面の糊残りの由来となる）フィルムをいい、この条件を充足するものである限り、フィルム、テープ、シート等の形状・寸法・材質・構造などには制限はなく、養生シートや養生テープも、マスキングフィルムやマスキングテープも、市販されている金属板の表面に剥離可能に貼られている疵発生用のシートも「表面保護フィルム」に該当する。
「表面保護フィルム」の材質の典型例は、ポリ塩化ビニール、ポリエチレン、ポリオレフィンなどであり、フィルムの糊の例は、アクリル系粘着剤、ゴム系粘着剤、ポリウレタン系粘着剤などである。“Surface protective film” means that when applied to the surface of a metal body, the surface of the metal body is covered and protected, and when peeled off, a residue of adhesive is generated on the surface of the metal body (in other words, the metal body As long as this condition is satisfied, there are no restrictions on the shape, dimensions, material, and structure of films, tapes, sheets, etc., and curing sheets and curing tapes are also available. In addition, the masking film and the masking tape, and the sheet for generating wrinkles that are releasably pasted on the surface of a commercially available metal plate also correspond to the “surface protective film”.
Typical examples of the material of the “surface protective film” are polyvinyl chloride, polyethylene, polyolefin and the like, and examples of the paste of the film are acrylic adhesive, rubber adhesive, polyurethane adhesive and the like.
本発明においては、表面保護フィルムが剥がされた金属体表面をコロナ放電が発生している環境に晒すことにより、糊残りをコロナ放電を用いて除去することができる。コロナ放電による糊残りの除去の程度は、従来の糊残りの除去に比してより効果的又は遜色がなく、それでいてその除去に必要な装置や設備は、主としてコロナ放電処理装置（電源を含む）やコロナ放電が生成している環境を取り囲むブースに止まるので、少なくとも装置や設備のコストの点で、従来よりも低額になる。従って、本発明によれば、表面保護フィルムが剥がされた金属体表面から、その表面保護フィルムに由来する糊残りを比較的簡単に又は低コストで除去することができ、その金属体表面を清浄化することができ、糊残りが原因となる塗装欠陥の発生頻度を低減することができる。 In the present invention, the adhesive residue can be removed using corona discharge by exposing the surface of the metal body from which the surface protective film has been peeled off to an environment where corona discharge occurs. The degree of removal of adhesive residue by corona discharge is less effective or inferior to that of conventional adhesive residue removal, and the devices and equipment required for the removal are mainly corona discharge treatment devices (including power supply). Since it stops at the booth surrounding the environment where the corona discharge is generated, the cost of the apparatus and equipment is lower than the conventional one. Therefore, according to the present invention, the adhesive residue derived from the surface protection film can be removed relatively easily or at low cost from the surface of the metal body from which the surface protection film has been peeled off, and the surface of the metal body is cleaned. The frequency of occurrence of coating defects caused by adhesive residue can be reduced.
以下、実施の形態又は実施例により本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail by way of embodiments or examples.
＜第１の実施形態＞
本発明の第１の実施形態は、次の工程を有する。
工程Ａ：疵発生防止用のシートが表面に貼られた金属板を用意する工程、
工程Ｂ：金属板表面からの当該シートを剥離する工程、及び
工程Ｃ：当該シートの剥離により露出する金属板表面をコロナ放電が発生している環境に晒す工程。<First Embodiment>
The first embodiment of the present invention includes the following steps.
Process A: The process of preparing the metal plate by which the sheet | seat for wrinkle generation prevention was affixed on the surface,
Step B: Step of peeling the sheet from the surface of the metal plate, and Step C: Step of exposing the surface of the metal plate exposed by peeling of the sheet to an environment where corona discharge is generated.
工程Ｃは、疵発生防止用のシートの剥離により露出する金属板の表面をコロナ放電処理装置により処理することにより実現することができる。図１は、コロナ放電処理装置１の要部の説明図である。図１において、２は当初疵発生防止用のシートの剥離を終えている金属板であり、その表面にコロナ放電処理が施されるものである。３は金属板２の円滑な移動を可能にする複数個のロールである。４は放電電極、５は金属板２に電位を与え、放電電極４との間で電位差を与える給電ロールである。６は高周波高電圧発生装置、７は電源である。このコロナ放電処理装置１によれば、金属板２の表面と放電電極４との間にコロナ放電が発生するので、金属板２の表面はコロナ放電が発生している環境に晒される。この環境に晒された後の金属板が２ａである。 Process C can be realized by treating the surface of the metal plate exposed by peeling of the sheet for preventing wrinkling with a corona discharge treatment apparatus. FIG. 1 is an explanatory diagram of a main part of the corona discharge treatment apparatus 1. In FIG. 1, reference numeral 2 denotes a metal plate which has been initially peeled off from the sheet for preventing wrinkles, and the surface thereof is subjected to corona discharge treatment. Reference numeral 3 denotes a plurality of rolls that enable smooth movement of the metal plate 2.
コロナ放電が発生している環境は、発生しているコロナ放電が、金属板２の表面に損傷を与えるほどに強いものではない環境とする。
金属板２の表面と放電電極４との間の距離は、１〜９ｍｍ程度の範囲が好ましい。１ｍｍ未満という短距離であるとコロナ放電が発生しないことがある。また、９ｍｍ超という長距離であると望ましいコロナ放電が発生しない場合があるからである。
ロール３上を移動する金属板２の移動速度は、０ｃｍ／分以上、３０ｍ／分以下の範囲が望ましい。なお、移動速度０ｃｍ／分とは、ロール３上において移動させることなくコロナ放電処理を行う場合に相当する。
コロナ放電の印加条件は、放電周波数を３０〜４０ｋＨｚ（３５プラス・マイナス５ｋＨｚ）、処理電力量を５０Ｗ／ｍ２／分以上、３０００Ｗ／ｍ２／分以下の範囲で設定する。
金属板２の表面と放電電極４との間の距離、金属板２の移動速度、処理電力量などの条件は、金属板２の種類、表面状況などによって可変とする。
コロナ放電処理装置１を通過させる回数も、金属板２の種類、表面状況などによって一回又は複数回とする。例えば、過度のコロナ放電処理を行うと、その放電に起因して金属体の表面が損傷を受ける。その損傷の有無や程度は、金属体の種類や状態によって変わる。それ故、損傷が生じやすい金属体の場合には、その表面を穏やかなコロナ放電条件で処理し、それを複数回行う。The environment in which the corona discharge is generated is an environment in which the generated corona discharge is not strong enough to damage the surface of the metal plate 2.
The distance between the surface of the metal plate 2 and the
The moving speed of the metal plate 2 moving on the roll 3 is preferably in the range of 0 cm / min to 30 m / min. The moving speed of 0 cm / min corresponds to the case where the corona discharge treatment is performed without moving on the roll 3.
The application conditions of the corona discharge are set such that the discharge frequency is 30 to 40 kHz (35 plus / minus 5 kHz) and the processing power is within a range of 50 W / m 2 / min to 3000 W / m 2 / min.
Conditions such as the distance between the surface of the metal plate 2 and the
The number of passes through the corona discharge treatment apparatus 1 is also set once or a plurality of times depending on the type of the metal plate 2 and the surface condition. For example, when an excessive corona discharge treatment is performed, the surface of the metal body is damaged due to the discharge. The presence / absence and extent of the damage vary depending on the type and state of the metal body. Therefore, in the case of a metal body that is easily damaged, the surface is treated under mild corona discharge conditions, and this is performed a plurality of times.
なお、コロナ放電が発生している環境は埃が少ないほど好ましいので、予め、コロナ放電処理装置を周囲から隔離して清浄度の高い空間に設置する、金属板２の表面と放電電極３との間に清浄度の高い気体を流しながらコロナ放電を発生させる等の必要な整備を済ませておく。 In addition, since the environment where corona discharge is generated is preferable as dust is less, the corona discharge treatment apparatus is previously separated from the surroundings and installed in a clean space between the surface of the metal plate 2 and the discharge electrode 3. Necessary maintenance such as generating corona discharge while flowing highly clean gas in the meantime is completed.
上記の条件のもので行ったものが、以下の実施例である。 What was performed on the said conditions is the following examples.
疵発生防止用のシートが表面に貼られた金属板は市販されているので、これを用いて効果確認をおこなった。
まず、金属板としてステンレス鋼板を選択した。用意したステンレス鋼板から疵防止用シートを剥離した後、ステンレス鋼板に適した通常の前処理として、アルカリ脱脂、水洗（湯洗、純水洗を含む複数段の水洗）及び乾燥を順に行い、液体塗料で塗装を行った。すると塗装直後の段階で塗料が、局所的に、複数箇所においてはじかれた（外観的には撥水状態に見える箇所である）。この塗料のはじきは、糊残りに起因するもので、はじきの発生は塗装品質の低下の直接の原因となる塗装欠陥の発生に直結する。A metal plate having a sheet for preventing wrinkles on its surface is commercially available, and the effect was confirmed using this.
First, a stainless steel plate was selected as the metal plate. After peeling off the sheet for preventing wrinkles from the prepared stainless steel plate, as a normal pretreatment suitable for the stainless steel plate, alkaline degreasing, water washing (water washing in multiple stages including hot water washing, pure water washing) and drying are performed in order, and liquid paint And painted. Then, immediately after the coating, the paint was locally repelled at a plurality of locations (appearing to be a water repellent state). The repellency of the paint is caused by the adhesive residue, and the occurrence of the repellency is directly connected to the occurrence of a coating defect that directly causes a decrease in coating quality.
これに対して、用意したステンレス鋼板から疵防止用シートを剥離した後、上記のコロナ処理装置を用いてコロナ放電処理を施し、引き続き上記通常の前処理を施すことなく、液体塗料で塗装を行った。すると塗装直後の段階で確認できていた塗料のはじきが、コロナ放電処理を施した範囲に限り、殆ど確認できなくなった。 On the other hand, after peeling off the wrinkle prevention sheet from the prepared stainless steel plate, the corona discharge treatment is performed using the corona treatment device, and then the coating is performed with the liquid paint without performing the normal pretreatment. It was. As a result, the repellency of the paint that had been confirmed immediately after coating could hardly be confirmed only within the range where the corona discharge treatment was performed.
次いで、金属板としてチタニウム板を選択した。用意したチタニウム板から疵防止用シートを剥離した後、ステンレス鋼板の場合と概ね同様の通常の前処理を行い、液体塗料で塗装を行った。すると塗装直後の段階で塗料が、局所的に、複数箇所においてはじかれた。これに対して、用意したチタニウム板から疵防止用シートを剥離した後、上記のコロナ処理装置を用いてコロナ放電処理を施し、引き続き上記通常の前処理を施すことなく、液体塗料で塗装を行った。すると塗装直後の段階で確認できていた塗料のはじきが、コロナ放電処理を施された範囲に限り、注視しても殆ど確認できなくなった。 Next, a titanium plate was selected as the metal plate. After peeling off the anti-wrinkle sheet from the prepared titanium plate, the same general pretreatment as in the case of the stainless steel plate was performed, and coating was performed with a liquid paint. Then, the paint was repelled locally at a plurality of locations immediately after painting. On the other hand, after the anti-wrinkle sheet is peeled off from the prepared titanium plate, the corona discharge treatment is performed using the corona treatment device, and the coating is then performed with the liquid paint without performing the normal pretreatment. It was. As a result, the repellency of the paint that had been confirmed immediately after the coating could hardly be confirmed even if it was observed only within the range where the corona discharge treatment was performed.
更に、金属板としてアルミニウム合金板（Ａ５０５２）を選択した。用意したアルミニウム合金板から疵防止用シートを剥離した後、通常の前処理として、アルカリ脱脂、酸洗、（湯洗、純水洗を含む複数段の水洗）及び乾燥を順に行い、液体塗料で塗装を行った。すると塗装直後の段階で塗料が、局所的に、複数箇所においてはじかれた。これに対して、用意したアルミニウム合金板から疵防止用シートを剥離した後、上記のコロナ処理装置を用いてコロナ放電処理を施し、引き続き上記通常の前処理を施すことなく、液体塗料で塗装を行った。すると塗装直後の段階で確認できていた塗料のはじきが、コロナ放電処理を施した範囲に限り、注視しても殆ど確認できなくなった。 Further, an aluminum alloy plate (A5052) was selected as the metal plate. After peeling off the sheet for preventing wrinkles from the prepared aluminum alloy plate, as usual pretreatment, perform alkaline degreasing, pickling, (water washing in multiple stages including hot water washing, pure water washing) and drying in order, and paint with liquid paint Went. Then, the paint was repelled locally at a plurality of locations immediately after painting. On the other hand, after peeling off the sheet for preventing wrinkles from the prepared aluminum alloy plate, the corona discharge treatment is performed using the corona treatment device described above, and the coating is then performed with the liquid paint without performing the normal pretreatment. went. Then, the repellency of the paint that could be confirmed at the stage immediately after coating could hardly be confirmed even if it was watched only within the range where the corona discharge treatment was performed.
純アルミニウム板（Ａ１０５０）を選択した。用意した純アルミニウム板から疵防止用シートを剥離した後、ステンレス鋼板の場合と概ね同様の通常の前処理を行い、液体塗料で塗装を行った。やはり塗料のはじきが確認できた。これに対して、用意した純アルミニウム板から疵防止用シートを剥離した後、上記のコロナ処理装置を用いてコロナ放電処理を施し、引き続き上記通常の前処理を施すことなく、液体塗料で塗装を行った。すると塗装直後の段階で確認できていた塗料のはじきが、コロナ放電処理を施した範囲に限り、注視しても殆ど確認できなくなった。 A pure aluminum plate (A1050) was selected. After peeling off the wrinkle-preventing sheet from the prepared pure aluminum plate, the same general pretreatment as in the case of the stainless steel plate was performed, and coating was performed with a liquid paint. After all, the repelling of the paint was confirmed. On the other hand, after peeling off the sheet for preventing wrinkles from the prepared pure aluminum plate, the corona discharge treatment is performed using the above corona treatment device, and the coating is then performed with the liquid paint without performing the above-described normal pretreatment. went. Then, the repellency of the paint that could be confirmed at the stage immediately after coating could hardly be confirmed even if it was watched only within the range where the corona discharge treatment was performed.
＜第２の実施形態＞
本発明の第２の実施形態は、次の工程を有する。
工程Ａ：表面保護フィルムが表面に貼られた金属板を用意する工程、
工程Ｘ：工程Ｂの前に、当該表面保護フィルムの上から金属板を強く擦る工程、
工程Ｂ：金属板表面からの当該表面保護フィルムを剥離する工程、及び
工程Ｃ：当該表面保護フィルムの剥離により露出する金属板表面をコロナ放電が発生している環境に晒す工程。<Second Embodiment>
The second embodiment of the present invention includes the following steps.
Process A: The process of preparing the metal plate by which the surface protective film was affixed on the surface,
Process X: Before the process B, the process of strongly rubbing the metal plate from above the surface protective film,
Process B: The process of peeling the said surface protection film from the metal plate surface, and Process C: The process of exposing the metal plate surface exposed by peeling of the said surface protection film to the environment where the corona discharge has generate | occur | produced.
第２の実施形態は、工程Ａと工程Ｂとの間に工程Ｘを有する点を除き、第１の実施形態と同じである。従って、工程Ｃは、疵発生防止用のシートの剥離により露出する金属板の表面を図１に示すコロナ放電処理装置により処理することにより実現することができる。 The second embodiment is the same as the first embodiment except that the process X is provided between the process A and the process B. Therefore, the process C can be realized by treating the surface of the metal plate exposed by peeling of the sheet for preventing wrinkle generation with the corona discharge treatment apparatus shown in FIG.
工程Ｘは、表面保護フィルム越しに金属体表面に大きな又は局所的な圧力が加わり、その結果表面保護フィルムの粘着物が金属体表面に糊残りとして残存するケース（例えば金属体の運搬、保管、出し入れ、展示、加工その他の流通過程や加工過程において、金属体同士が擦れ合う、金属体に他の物体が押し当てられる、金属体に他の物体が衝突するなどの出来事や作業工程を通じて、表面保護フィルムが金属体表面に強く、局所的に押し付けられ、表面保護フィルムの粘着物が金属体表面に強く付着し、表面保護フィルムを剥がした後の金属体表面に糊残りとして残存するケース）を想定したものでもある。 In the process X, a large or local pressure is applied to the surface of the metal body through the surface protection film, and as a result, the sticking material of the surface protection film remains on the surface of the metal body as adhesive residue (for example, transportation, storage of the metal body, Surface protection through events and work processes such as metal bodies rubbing against each other, other objects being pressed against metal bodies, and other objects colliding with metal bodies during distribution, processing, etc. Assuming that the film is strong and locally pressed on the surface of the metal body, the adhesive of the surface protection film adheres strongly to the surface of the metal body, and remains on the surface of the metal body after peeling off the surface protection film) It is also a thing.
さて、市販の金属板は管理状態が良好であると、糊残りに起因する塗料のはじきが発生する箇所が少なくなり、また視認が難しくなり、管理状態が劣悪であると、糊残りに起因する塗装欠陥とそうでない塗装欠陥との区別がしにくくなる。このとき、工程Ｘを追加すると、表面保護フィルムを強く擦った領域において、表面保護フィルムの粘着物が金属体表面に糊残りとして残存し易くなるので、他の領域との対比が容易になる。
この点を考慮しつつ行ったものが、以下の実施例である。Well, when a commercially available metal plate is in a good management state, the number of places where paint repelling occurs due to adhesive residue is reduced, and it is difficult to visually recognize, and when the management state is poor, it is caused by adhesive residue. It becomes difficult to distinguish between coating defects and other coating defects. At this time, if the process X is added, the adhesive of the surface protective film tends to remain as adhesive residue on the surface of the metal body in the region where the surface protective film is strongly rubbed, so that comparison with other regions is facilitated.
The following example was carried out in consideration of this point.
市販の、疵防止用シートが貼られたステンレス銅板を用意し、所定の領域を設定し、その領域内で、疵防止用シートの上からステンレス鋼板の表面をヘラ状の道具で強く擦った。その後、疵防止用シートを剥離し、当該所定の領域とその他の領域を電子顕微鏡（２０００〜５０００倍）で観察したところ、当該所定の領域において、その他の領域に比べて著しく高い頻度で、ステンレス鋼板の圧延疵に沿ってできた凹部に糊残りを確認することができた。 A commercially available stainless steel copper plate with a wrinkle prevention sheet attached thereto was prepared, a predetermined region was set, and the surface of the stainless steel plate was rubbed strongly with a spatula-shaped tool from above the wrinkle prevention sheet. Thereafter, the anti-wrinkle sheet is peeled off, and the predetermined region and other regions are observed with an electron microscope (2000 to 5000 times), and the stainless region has a significantly higher frequency in the predetermined region than the other regions. Adhesive residue could be confirmed in the recesses formed along the rolling mill of the steel plate.
疵防止用シートの上からステンレス鋼板の表面をヘラ状の道具で強く擦り、次いで疵防止用シートを剥離し、ステンレス鋼板に適した通常の前処理（既述）を行い、液体塗料で塗装を行った。すると塗装直後の段階で塗料が、当該所定の領域において、その他の領域に比べてかなり多い箇所ではじかれた（はじかれた箇所は外観的には撥水状態に見えるので、他の箇所から区別できる）。
これに対して、疵防止用シートの上からステンレス鋼板の表面をヘラ状の道具で強く擦擦り、次いで疵防止用シートを剥離した後、上記のコロナ処理装置を用いてコロナ放電処理を施し、引き続き上記通常の前処理を施すことなく、液体塗料で塗装を行った。すると塗装直後の段階で確認できていた塗料のはじきが、当該所定の領域においてもその他の領域においても、コロナ放電処理を施した範囲に限り、殆ど確認できなくなった。Scratch the surface of the stainless steel plate with a spatula-shaped tool from above the anti-wrinkle sheet, then peel off the anti-wrinkle sheet, perform the normal pretreatment (described above) suitable for the stainless steel plate, and paint with a liquid paint. went. Then, immediately after painting, the paint was repelled in the predetermined area at a much larger area than the other areas (the repelled area looks water repellent in appearance, so it can be distinguished from other areas). it can).
On the other hand, after rubbing the surface of the stainless steel plate strongly with a spatula-like tool from above the anti-wrinkle sheet, and then peeling off the anti-wrinkle sheet, the corona discharge treatment is performed using the above corona treatment device, Subsequently, coating was performed with a liquid paint without performing the normal pretreatment. Then, the repelling of the paint that could be confirmed immediately after the coating could hardly be confirmed in the predetermined region and other regions only within the range where the corona discharge treatment was performed.
疵防止用シートの上からステンレス鋼板の表面を強く擦すった領域においてもその他の領域においても、コロナ放電処理を施した範囲に限り、塗料のはじきが殆ど確認できなかったという結果は、金属板がチタニウム板、アルミニウム合金板（Ａ５０５２）、純アルミニウム板（Ａ１０５０）においても同様であった。 In the area where the surface of the stainless steel plate was rubbed strongly from the top of the sheet for preventing wrinkles and in other areas, the result that almost no repelling of the paint could be confirmed in the area where the corona discharge treatment was performed. However, the same was true for the titanium plate, aluminum alloy plate (A5052), and pure aluminum plate (A1050).
以上のとおり、工程Ａ、Ｂ及びＣ又は工程Ａ、Ｘ、Ｂ及びＣを実行すれば、表面保護フィルムが剥がされた金属体表面からの糊残りの除去、ひいては糊残りに起因する塗装欠陥の発生頻度の低減を比較的簡単に又は低コストで達成することができる。従って、コロナ放電を用いる糊残りの除去を基礎として、本発明に係る糊残り除去方法並びに、金属体表面の清浄化方法、塗装前処理方法及び塗装方法を実現することができる。 As described above, if Steps A, B and C or Steps A, X, B and C are performed, removal of adhesive residue from the surface of the metal body from which the surface protective film has been peeled off, and consequently, coating defects caused by adhesive residue. Reduction of the occurrence frequency can be achieved relatively easily or at low cost. Therefore, based on the removal of adhesive residue using corona discharge, the adhesive residue removal method, the metal body surface cleaning method, the coating pretreatment method, and the coating method according to the present invention can be realized.
本発明は、上記の実施形態又は実施例に限定されるものではなく、説明しない他の技術的要素と組み合わせることもできる。 The present invention is not limited to the above-described embodiments or examples, and can be combined with other technical elements not described.
１・・・コロナ放電処理装置、２・・・金属板、３・・・ロール、４・・・放電電極、５・・・給電ロール、６・・・高周波高電圧発生装置、７・・・電源DESCRIPTION OF SYMBOLS 1 ... Corona discharge treatment apparatus, 2 ... Metal plate, 3 ... Roll, 4 ... Discharge electrode, 5 ... Feeding roll, 6 ... High frequency high voltage generator, 7 ... Power supply
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