JP4410383B2 - Method for measuring color of colored paint coating film and method for toning colored paint using this measurement method - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、着色塗料塗膜の色の測定方法、特に着色塗料塗膜にクリヤ塗膜が形成された複層塗膜における着色塗料塗膜の色の測定方法、及びこの測定方法を用いたカラーベース塗料の調色方法に関する。
【０００２】
【従来の技術及びその課題】
従来、自動車補修塗装などの補修塗装の分野においては、調色候補塗料を塗装した工程塗装板である経過塗装板の塗色を、基準となる実車の補修塗装部近傍の色と比較し、調色候補塗料の色を補正して再び経過塗装板を作成することを色が合格となるまで繰り返して補修塗料の調色を行っていた。この調色に際して、測色計を併用した補修塗料の調色も行なわれていた。
【０００３】
しかしながら、この方法においては、工程板である経過塗装板は、例えば、上塗り塗膜が着色塗膜とクリヤ塗膜との複層である場合には、着色塗料を塗装後、セッティングし、ついでこの上にクリヤ塗料を塗装した後、焼付けて作成しており、この経過塗装板の作成のためのセッティング及び焼付けに、通常、３０分間程度を要するといった問題があった。また、上塗り塗膜が着色塗膜のみの場合においても通常、２０分間程度を要するといった問題があった。
【０００４】
本発明の目的は、例えば、着色塗料から形成される着色塗膜の色を短時間で精度よく予測できる方法、なかでも着色塗膜とクリヤ塗膜との複層における着色塗膜を形成する塗料の調色を行うに際し、短時間で精度よく着色塗膜の色を予測できる方法を提供することである。
【０００５】
また、本発明の目的は、着色塗膜とクリヤ塗膜との複層における着色塗膜を形成する着色塗料の調色を短時間で精度よく行うことができる調色方法を提供することである。
【０００６】
【課題を解決するための手段】
本発明者らは、指触乾燥された着色塗料塗膜の上に、この塗膜を溶解しない液体を塗布し、この上に無色透明で固体状の薄膜を載せ、その薄膜を介して着色塗料塗膜の色を測定することによって、また、この測定方法を用いて着色塗料の調色を行うことによって上記目的を達成することができることを見出し本発明を完成するに至った。
【０００７】
すなわち、本発明は、着色塗膜とクリヤ塗膜との複層塗膜における、該着色塗膜を形成する塗料を調色する場合に、着色塗膜の色を予測することができる方法であって、（１）基板上に着色塗料を塗装し指触乾燥させる工程、（２）上記指触乾燥された着色塗料塗膜の上に、該指触乾燥塗膜を溶解させない無色透明の液体を塗布し、該着色塗料塗膜上に該無色透明の液体を介して無色透明で固形状の薄膜を載置する工程及び（３）無色透明で固形状の薄膜の上から着色塗料塗膜の色を測色計にて測定する工程、を有することを特徴とする着色塗料塗膜の色の測定方法を提供するものである。
【００１０】
また、本発明は、着色塗膜とクリヤ塗膜との複層塗膜における該着色塗膜形成用の着色塗料を調色する方法であって、（Ａ）基板上に調色された候補の着色塗料を塗装し指触乾燥させる工程、（Ｂ）上記指触乾燥された候補の着色塗料塗膜の上に、該指触乾燥塗膜を溶解させない無色透明の液体を塗布し、該着色塗料塗膜上に該無色透明の液体を介して無色透明で固形状の薄膜を載置する工程、（Ｃ）無色透明で固形状の薄膜の上から該着色塗料塗膜の色を測色計にて測定する工程及び（Ｄ）上記工程（Ｃ）による該着色塗料塗膜の色の測定結果に基づき、候補の着色塗料塗膜の色の測色計による測定値と、塗色を合せる基準色の測色計による測定値とから候補の着色塗料の配合を補正する工程を有し、工程（Ｃ）における該着色塗料塗膜の色の測定結果が合格となるまで上記（Ａ）〜（Ｄ）の工程を繰り返し行うことを特徴とする着色塗料の調色方法を提供するものである。
【００１２】
【発明の実施の形態】
本発明における着色塗料塗膜の色の測定方法は、着色塗膜と無色クリヤ塗膜との複層塗膜における、上記着色塗膜を形成する塗料を調色する場合に、短時間に、かつ精度よく着色塗膜の色を予測することができる方法であり、下記の工程（１）〜（３）を有する。
【００１３】
工程（１）
工程（１）は、基板上に着色塗料を塗装し指触乾燥させる工程である。基板としては、調色経過塗板を形成するのに使用されうる被塗物であれば特に制限なく使用でき、金属板、紙、プラスチックフィルムなどを使用することができる。
【００１４】
着色塗料は、着色顔料及び光輝性粉末（アルミニウム粉、光輝性マイカ粉、光輝性グラファイト、金粉、銅粉など）のうちの少なくとも１種を含有する塗料である。
【００１５】
基板上に着色塗料を塗装し指触乾燥させるが、その塗装膜厚（乾燥塗膜厚）は、通常、色を合せようとする着色塗膜と無色クリヤ塗膜との複層塗膜における着色塗膜と同程度の膜厚（通常、隠蔽膜厚程度以上の膜厚）とすることが好適であり、塗装後、通常、短時間放置して指触乾燥させる。場合によって熱風を当てるなど加熱して指触乾燥させてもよい。
【００１６】
工程（２）
工程（２）は、上記指触乾燥された着色塗料塗膜の上に、該指触乾燥塗膜を溶解させない無色透明の液体を塗布し、該着色塗料塗膜上に該無色透明の液体を介して無色透明で固形状の薄膜を載置する工程である。
【００１７】
上記指触乾燥塗膜を溶解させない無色透明の液体としては、着色塗料に使用される樹脂の種類などによって異なるが、通常、例えば、ＶＭ＆Ｐナフサ、ミネラルスピリット、ソルベント灯油、芳香族ナフサ、ソルベントナフサ、ソルベッソ１００、ソルベッソ１５０、ソルベッソ２００［「ソルベッソ」はエッソ石油社の登録商標］、スワゾール３１０、スワゾール１０００、スワゾール１５００［「スワゾール」はコスモ石油社の登録商標］、ＬＡソルベント（日本石油(株)製）などの比較的溶解力の小さい脂肪族系又は芳香族系炭化水素類；ｎ−ブタン、ｎ−ヘキサン、ｎ−ヘプタン、ｎ−オクタン、イソノナン、ｎ−デカン、ｎ−ドデカン、シクロペンタン、シクロヘキサン、シクロブタンなどの脂肪族炭化水素類；水などが好適に用いられる。
【００１８】
上記無色透明の液体の塗布量は、無色透明で固形状の薄膜を、空気による気泡を挟むことなく載置できる量であることが好ましく、通常、約５０〜３００ｇ／ｍ2、さらに１００〜１５０ｇ／ｍ2の範囲内であることが好適である。
【００１９】
着色塗料塗膜上に載置する無色透明で固形状の薄膜としては、上記無色透明の液体に溶解しないものが使用され、具体例としては、ポリウレタン、ポリエステル、ポリメチルメタクリレートなどのプラスチックスフィルム；クリヤ塗料の硬化単離塗膜、ガラス板などを挙げることができる。なかでも、色を合わせるべき着色塗膜と無色クリヤ塗膜との複層塗膜における無色クリヤ塗膜を形成するクリヤ塗料と同種樹脂系のクリヤ塗料の硬化単離塗膜であることが好適である。
【００２０】
工程（３）
工程（３）は、無色透明で固形状の薄膜の上から着色塗料塗膜の色を測定する工程である。
【００２１】
上記色の測定は、目視によるものであっても、測色計による測定であってもよい。測色計としては、単角度測色計、多角度測色計、ミクロ光輝感測定器などを挙げることができる。
【００２２】
上記測定方法によって、着色塗膜と無色クリヤ塗膜との複層塗膜における着色塗膜を形成する塗料を調色する場合に、短時間に、かつ精度よく着色塗膜の色を予測することができ、この測定した色は、着色塗料を塗装しセッティング後、クリヤ塗料を塗装し焼付けて得た複層塗膜の塗色と良好な一致性を示す。
【００２３】
次に、本発明の調色方法について説明する。
本発明の調色方法は、着色塗膜とクリヤ塗膜との複層塗膜における着色塗膜形成用の着色塗料を調色する方法であって、下記（Ａ）〜（Ｄ）の工程を有する。
【００２４】
工程（Ａ）
工程（Ａ）は、基板上に調色された候補の着色塗料を塗装し指触乾燥させる工程である。
【００２５】
基板としては、調色経過塗板を形成するのに使用されうる被塗物であれば特に制限なく使用でき、金属板、紙、プラスチックフィルムなどを使用することができる。
【００２６】
塗装される上記調色された候補の着色塗料は、色を合せるべき複層塗膜における着色塗膜の色番がわかっている場合には、その色番の塗料配合による着色塗料であることができるし、また、複層塗膜を多角度測色計などの測色計による測定値に基き、複数の原色塗料の色特性データが登録され色合わせ計算ロジックが作動するコンピュータによって求めた塗料配合による着色塗料であることができるし、また、その他の近似色であることができる。
【００２７】
上記候補の着色塗料の塗装膜厚（乾燥塗膜厚）は、通常、色を合せようとする着色塗膜とクリヤ塗膜との複層塗膜における着色塗膜と同程度の膜厚（通常、隠蔽膜厚程度以上の膜厚）とすることが好適であり、塗装後、通常、短時間放置して指触乾燥させる。場合によって熱風を当てるなど加熱して指触乾燥させてもよい。
【００２８】
工程（Ｂ）
工程（Ｂ）は、上記指触乾燥された候補の着色塗料塗膜の上に、該指触乾燥塗膜を溶解させない無色透明の液体を塗布し、該着色塗料塗膜上に該無色透明の液体を介して無色透明で固形状の薄膜を載置する工程であり、前記本発明の測定方法における工程（２）と同様の工程である。
【００２９】
工程（Ｃ）
工程（Ｃ）は、無色透明で固形状の薄膜の上から該着色塗料塗膜の色を測定する工程であり、前記本発明の測定方法における工程（３）と同様の工程である。
【００３０】
工程（Ｄ）
工程（Ｄ）は、上記工程（Ｃ）による該着色塗料塗膜の色の測定結果に基づき、候補の着色塗料の配合を補正する工程である。
【００３１】
色の測定を目視で行い勘にたよって着色塗料の配合を補正することもできるが、測色計によって色の測定を行い、その測定値に基き前記色合わせ計算ロジックが作動するコンピュータによって配合計算を行い、候補の着色塗料の配合を補正して色を合せるべき基準の複層塗膜の塗色に近づけることが好ましい。
【００３２】
上記工程（Ａ）、（Ｂ）、（Ｃ）及び（Ｄ）は、工程（Ｃ）における該着色塗料塗膜の色の測定結果が合格となるまで繰り返し行われる。
【００３３】
上記本発明の調色方法によって、着色塗膜と無色クリヤ塗膜との複層塗膜における着色塗膜を形成する塗料を調色する場合に、短時間に、かつ精度よく調色経過塗装板の着色塗膜の色を予測することができ、この測定した色は、着色塗料を塗装しセッティング後、クリヤ塗料を塗装し焼付けて得た複層塗膜の塗色と良好な一致性を示すものであり、調色時間を短縮することができる。
【００３４】
【実施例】
以下、実施例を挙げて本発明をさらに具体的に説明する。なお、本発明は実施例に限定されるものではない。
【００３５】
実施例１
レタンＰＧ２Ｋ（関西ペイント（株）製、自動車補修用アクリルウレタン樹脂塗料）の原色を使用し、自動車車体色Ａ（シルバーメタリック色）の登録基本配合に基づいて下記表１に示す割合で配合して着色塗料を得た。
【００３６】
表１ 自動車車体色Ａ
得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、無色透明な液体Ａ[ｎ−ヘプタン／ＬＡソルベント（注１）＝１／２(重量比)の混合物]を１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上にウレタンクリヤ塗料からの単離塗膜である厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００３８】
（注１）ＬＡソルベント：日本石油（株）製、高沸点炭化水素系溶剤、ナフテン、パラフィンを主成分とする。
【００３９】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表２に示すとおりであった。
【００４０】
表２
また、従来の工程に基づき、ブリキ板上に上記と同じ着色塗料を同様の方法で塗装し、約５分間セッティング後、関西ペイント（株）製「レタンＰＧ２Ｋクリヤー」を硬化膜厚が約５０μｍとなるように塗装し６０℃３０分乾燥後、「Ｖａｎ−ＶａｎＦＡセンサー」を用いて前記と同様に測色を行った。その結果は下記表３に示すとおりであった。
【００４２】
表３
表２のデータと表３のデータを比較検討し、また、各々の作成塗板を目視判定した結果、大差がなく、着色塗料の指触乾燥塗膜〜無色透明液体塗布〜ウレタンクリヤーフィルム貼付の工程による測定用塗板は、従来の着色塗料〜ウレタンクリヤー塗装〜強制乾燥の工程による測定用塗板の代替になり得るものであった。
【００４４】
実施例２
レタンＰＧ２Ｋの原色を使用し、自動車車体色Ｂ（ブルー系パール色）の登録基本配合に基づいて下記表４に示す割合で配合して着色塗料を得た。
【００４５】
表４ 自動車車体色Ｂ
得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、実施例１で使用した無色透明な液体Ａを１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上に実施例１で使用した厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００４７】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表５に示すとおりであった。
【００４８】
表５
また、従来の工程に基づき、ブリキ板上に上記と同じ着色塗料を同様の方法で塗装し、約５分間セッティング後、関西ペイント（株）製「レタンＰＧ２Ｋクリヤー」を硬化膜厚が約５０μｍとなるように塗装し６０℃３０分乾燥後、「Ｖａｎ−ＶａｎＦＡセンサー」を用いて前記と同様に測色を行った。その結果は下記表６に示すとおりであった。
【００５０】
表６
表５のデータと表６のデータを比較検討し、また、各々の作成塗板を目視判定した結果、大差がなく、着色塗料の指触乾燥塗膜〜無色透明液体塗布〜ウレタンクリヤーフィルム貼付の工程による測定用塗板は、従来の着色塗料〜ウレタンクリヤー塗装〜強制乾燥の工程による測定用塗板の代替になり得るものであった。
【００５２】
実施例３
レタンＰＧ２Ｋの原色を使用し、自動車車体色Ｃ（赤系パール色）の登録基本配合に基づいて下記表７に示す割合で配合して着色塗料を得た。
【００５３】
表７ 自動車車体色Ｃ
得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、実施例１で使用した無色透明な液体Ａを１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上に実施例１で使用した厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００５５】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表８に示すとおりであった。
【００５６】
表８
また、従来の工程に基づき、ブリキ板上に上記と同じ着色塗料を同様の方法で塗装し、約５分間セッティング後、関西ペイント（株）製「レタンＰＧ２Ｋクリヤー」を硬化膜厚が約５０μｍとなるように塗装し６０℃３０分乾燥後、「Ｖａｎ−ＶａｎＦＡセンサー」を用いて前記と同様に測色を行った。その結果は下記表９に示すとおりであった。
【００５８】
表９
表８のデータと表９のデータを比較検討し、また、各々の作成塗板を目視判定した結果、大差がなく、着色塗料の指触乾燥塗膜〜無色透明液体塗布〜ウレタンクリヤーフィルム貼付の工程による測定用塗板は、従来の着色塗料〜ウレタンクリヤー塗装〜強制乾燥の工程による測定用塗板の代替になり得るものであった。
【００６０】
使用装置及び測定方法について
以下の各実施例において、調色により塗料の塗色を合せるべき基準色などの塗色の測定は、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、鏡面反射軸と受光軸のなす角度が２５度、４５度、７５度の３角度条件で測定して測色値を得た。また、複数の原色塗料の色特性データが登録されており、該各塗料配合及び該各データを利用した色合わせ計算ロジックが作動するコンピュータとして、関西ペイント（株）製のコンピュータ・カラー・マッチング装置「Ｖａｎ−ＶａｎＦＡステーション」を用いて調色を行った。
【００６１】
実施例４
レタンＰＧ２Ｋの原色を使用し、自動車車体色Ｄ（グレー系パール色）の調色を実施した。
【００６２】
まず、調色すべき車体色Ｄのパーツを関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表１０に示すとおりであった。
【００６３】
表１０
次に、表１０の測色値を使用し、関西ペイント（株）製のコンピュータ・カラー・マッチング装置「Ｖａｎ−ＶａｎＦＡステーション」を用いて、最近似配合を検索し色を寄せる補正を加えた形の第1回の調色候補色配合として表１１の着色塗料配合を取得した。
【００６５】
表１１
表１１の配合で得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、実施例１で使用した無色透明な液体Ａを１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上に実施例１で使用した厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００６７】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表１２に示すとおりであった。
【００６８】
表１２
表１２の測色値に基づき、関西ペイント（株）製の「Ｖａｎ−ＶａｎＦＡステーション」を用いて、色を寄せる修正配合を問合せたところ、第2回の調色候補色配合として表１３の配合を取得した。
【００７０】
表１３
表１３の配合で得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、実施例１で使用した無色透明な液体Ａを１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上に実施例１で使用した厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００７２】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表１４に示すとおりであった。
【００７３】
表１４
表１４の測色値及び目視評価により、第2回調色候補色の色ずれは十分塗装可能と判断されるレベルであった。
【００７５】
また、別に、第2回調色候補色の着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装し、約５分間セッティング後、関西ペイント（株）製「レタンＰＧ２Ｋクリヤー」を硬化膜厚が約５０μｍとなるように塗装し６０℃３０分乾燥した従来工程による塗装板について、「Ｖａｎ−ＶａｎＦＡセンサー」を用いて前記と同様に測色を行った。その結果は下記表１５に示すとおりであり、基準板との色差ΔＥも記載した。
【００７６】
表１５
表１５の測色値及び目視評価からも、第2回調色候補色の色ずれは十分塗装可能と判断されるレベルであり、この第2回調色候補色は、自動車車体色Ｄの調色塗料色として採用できるものであった。
【００７８】
実施例５
レタンＰＧ２Ｋの原色を使用し、自動車車体色Ｅ（ブルー系パール色）の調色を実施した。
まず、調色すべき車体色Ｅのパーツを関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表１６に示すとおりであった。
【００７９】
表１６
次に、表１６の測色値を使用し、関西ペイント（株）製の「Ｖａｎ−ＶａｎＦＡステーション」を用いて、最近似配合を検索し色を寄せる補正を加えた形の第1回の調色候補色配合として表１７の着色塗料配合を取得した。
【００８１】
表１７
表１７の配合で得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、実施例１で使用した無色透明な液体Ａを１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上に実施例１で使用した厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００８３】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表１８に示すとおりであった。
【００８４】
表１８
表１８の測色値に基づき、関西ペイント（株）製の「Ｖａｎ−ＶａｎＦＡステーション」を用いて、色を寄せる修正配合を問合せたところ、第2回の調色候補色配合として下記表１９の配合を取得した。
【００８６】
表１９
表１９の配合で得られた着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装を行った。２０℃で５分間放置して指触乾燥させた後、無色透明な液体Ａを１０ｃｍ×１０ｃｍの塗板に約１ｇ塗布し、続いて、この上に厚さ約７０〜１００μｍの無色透明のウレタンクリヤーフィルムを貼付して測定用塗板を得た。得られた測定用塗板は着色塗膜とウレタンクリヤーフィルムとの間に空気による気泡が挟まれていないものであった。
【００８８】
上記の測定用塗板について、関西ペイント（株）製の多角度測色計「Ｖａｎ−ＶａｎＦＡセンサー」を用いて、２５°、４５°及び７５°の３角度条件にて測色を行った。その結果は下記表２０に示すとおりであった。
【００８９】
表２０
表２０の測色値及び目視評価により、第2回調色候補色の色ずれは十分塗装可能と判断されるレベルであった。
【００９１】
また、別に、第2回調色候補色の着色塗料を基板（ブリキ板）上に乾燥膜厚が約２０μｍとなるようにスプレー塗装し、約５分間セッティング後、関西ペイント（株）製「レタンＰＧ２Ｋクリヤー」を硬化膜厚が約５０μｍとなるように塗装し６０℃３０分乾燥した従来工程による塗装板について、「Ｖａｎ−ＶａｎＦＡセンサー」を用いて前記と同様に測色を行った。その結果は下記表２１に示すとおりであり、基準版との色差ΔＥも記載した。
【００９２】
表２１
表２１の測色値及び目視評価からも、第2回調色候補色の色ずれは十分塗装可能と判断されるレベルであり、この第2回調色候補色は、自動車車体色Ｅの調色塗料色として採用できるものであった。
【００９４】
【発明の効果】
本発明における着色塗料塗膜の色の測定方法によって、従来方法における着色経過塗板の塗色の測定方法と良く一致した測定結果を得ることができる。したがって、この測定方法を用いた本発明の調色方法によると、着色塗膜とクリヤ塗膜との複層における着色塗膜を形成する着色塗料の調色を短時間で精度よく行うことができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for measuring the color of a colored coating film, particularly a method for measuring the color of a colored coating film in a multilayer coating film in which a clear coating film is formed on the colored coating film, and a color base using this measuring method. The present invention relates to a method for toning a paint.
[0002]
[Prior art and problems]
Conventionally, in the field of repair coating such as automotive repair coating, the paint color of the process paint plate, which is the process paint plate coated with the color matching candidate paint, is compared with the color near the repair paint part of the actual actual vehicle. Toning of the repair paint was repeated by correcting the color of the color candidate paint and creating the progress paint plate again until the color passed. At the time of this toning, the toning of a repair paint using a colorimeter was also performed.
[0003]
However, in this method, the progress coating plate, which is a process plate, is set after coating the colored paint, for example, when the top coating film is a multilayer of a colored coating film and a clear coating film. After the clear paint was applied to the top, it was baked to create, and there was a problem that it usually took about 30 minutes for setting and baking for the preparation of the progress coated plate. Further, even when the top coat film is only a colored film, there is a problem that usually it takes about 20 minutes.
[0004]
The object of the present invention is, for example, a method capable of accurately predicting the color of a colored coating film formed from a colored coating material in a short time, and in particular, a coating material for forming a colored coating film in a multilayer of a colored coating film and a clear coating film It is to provide a method capable of accurately predicting the color of a colored coating film in a short time when performing the toning.
[0005]
Another object of the present invention is to provide a toning method that can accurately perform the toning of a colored paint forming a colored coating film in a multilayer of a colored coating film and a clear coating film in a short time. .
[0006]
[Means for Solving the Problems]
The present inventors applied a liquid that does not dissolve this coating film onto a colored coating film that has been dried by touching, and placed a colorless, transparent and solid thin film thereon, and the colored coating film is disposed through the thin film. The present invention has been completed by finding that the object can be achieved by measuring the color of the coating film and by adjusting the color of the colored paint using this measuring method.
[0007]
That is, the present invention is a method capable of predicting the color of a colored coating film when toning a paint that forms the colored coating film in a multilayer coating film of a colored coating film and a clear coating film. Te, step (2) on the touch dried colored paint coating, the finger touch dryness without coating dissolve colorless transparent liquid drying Yubisawa painted colored coating on (1) the substrate A step of applying and placing a colorless, transparent, and solid thin film on the colored coating film through the colorless and transparent liquid; and (3) the color of the colored coating film from above the colorless, transparent, and thin film. The method for measuring the color of a colored paint coating film characterized by comprising: a step of measuring the color with a colorimeter .
[0010]
Further, the present invention is a method for toning a colored coating material for forming a colored coating film in a multilayer coating film of a colored coating film and a clear coating film, and (A) a candidate for toning on a substrate (B) applying a colorless and transparent liquid that does not dissolve the dry-to-touch paint film onto the candidate dry-painted paint film that has been dry-touched to the touch; A step of placing a colorless, transparent, and solid thin film on the coating film via the colorless and transparent liquid; (C) the color of the colored coating film from above the colorless, transparent, and solid thin film into a colorimeter And (D) based on the measurement result of the color of the colored paint coating film in the above step (C), the color measured by the colorimeter of the candidate colored paint coating film, and the reference color that matches the paint color from the measured values and by colorimeter has a step of correcting the formulation of pigmented coatings of candidates, step (C) in the colored paint coating Until the measurement result is accepted is to provide the (A) ~ toning methods colored coating, characterized in repeating the steps of (D).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The method for measuring the color of the colored coating film in the present invention is a method for adjusting the color of the coating film forming the colored coating film in a multilayer coating film of the colored coating film and the colorless clear coating film, and in a short time, and This is a method capable of accurately predicting the color of the colored coating film, and includes the following steps (1) to (3).
[0013]
Process (1)
Step (1) is a step of applying a colored paint on the substrate and drying it by touch. The substrate can be used without particular limitation as long as it can be used for forming the toning progress coating plate, and a metal plate, paper, plastic film, or the like can be used.
[0014]
The colored paint is a paint containing at least one of a color pigment and glitter powder (aluminum powder, glitter mica powder, glitter graphite, gold powder, copper powder, etc.).
[0015]
A colored paint is applied to the substrate and dried with the touch of a finger. The coating thickness (dry coating thickness) is usually colored in a multilayer coating of a colored coating to be matched with a colorless clear coating. It is preferable to have a film thickness comparable to that of the coating film (usually a film thickness equal to or greater than the concealment film thickness). In some cases, it may be heated by applying hot air or the like and dried by touch.
[0016]
Process (2)
In step (2), a colorless and transparent liquid that does not dissolve the dry-touched paint film is applied on the touch-dried colored paint film, and the colorless and transparent liquid is applied on the colored paint film. In this step, a colorless transparent and solid thin film is placed.
[0017]
The colorless and transparent liquid that does not dissolve the dry touch-coated film varies depending on the type of resin used in the colored paint, but usually, for example, VM & P naphtha, mineral spirit, solvent kerosene, aromatic naphtha, solvent naphtha, Solvesso 100, Solvesso 150, Solvesso 200 ["Sorvesso" is a registered trademark of Esso Petroleum Corporation], Swazol 310, Swazol 1000, Swazol 1500 ["Swazol" is a registered trademark of Cosmo Oil Co., Ltd.], LA Solvent (Japan Petroleum Corporation) Aliphatic or aromatic hydrocarbons having a relatively low dissolving power such as n-butane, n-hexane, n-heptane, n-octane, isononane, n-decane, n-dodecane, cyclopentane, Aliphatic hydrocarbons such as cyclohexane and cyclobutane; It is.
[0018]
The coating amount of the colorless and transparent liquid is preferably such an amount that a colorless and transparent solid thin film can be placed without interposing air bubbles. Usually, the amount is about 50 to 300 g / m 2 , and further 100 to 150 g. / M 2 is preferable.
[0019]
As the colorless, transparent, and solid thin film placed on the colored coating film, one that does not dissolve in the colorless and transparent liquid is used. Specific examples include plastics films such as polyurethane, polyester, and polymethyl methacrylate; Examples thereof include a cured and isolated coating of clear paint and a glass plate. Among them, it is preferable to be a cured and isolated coating of a clear coating of the same kind as a clear coating that forms a colorless clear coating in a multilayer coating of a colored coating and a colorless clear coating to be matched in color. is there.
[0020]
Step (3)
Step (3) is a step of measuring the color of the colored paint coating film from above the colorless and transparent solid thin film.
[0021]
The measurement of the color may be by visual observation or by a colorimeter. Examples of the colorimeter include a single angle colorimeter, a multi-angle colorimeter, and a micro brightness meter.
[0022]
Predicting the color of a colored coating film in a short time and with high accuracy when toning a paint that forms a colored coating film in a multilayer coating film of a colored coating film and a colorless clear coating film by the above measurement method The measured color shows good consistency with the coating color of the multilayer coating film obtained by applying a colored paint, setting, then applying a clear paint and baking.
[0023]
Next, the toning method of the present invention will be described.
The toning method of the present invention is a method of toning a colored paint for forming a colored coating film in a multilayer coating film of a colored coating film and a clear coating film, and includes the following steps (A) to (D): Have.
[0024]
Step (A)
The step (A) is a step of applying a candidate color paint toned on the substrate and drying it by touch.
[0025]
The substrate can be used without particular limitation as long as it can be used for forming the toning progress coating plate, and a metal plate, paper, plastic film, or the like can be used.
[0026]
If the color number of the colored coating in the multilayer coating to be matched is known, the toned candidate colored coating to be applied may be a colored coating by blending the coating of that color number. In addition, based on the measurement values of a multi-layer coating film measured by a colorimeter such as a multi-angle colorimeter, the color composition data of multiple primary color paints are registered, and the paint composition obtained by a computer that operates the color matching calculation logic It can be a colored paint, or it can be another approximate color.
[0027]
The coating thickness (dry coating thickness) of the above-mentioned candidate color coating is usually the same as that of the color coating in a multilayer coating of a colored coating and a clear coating to match the colors (usually normal) It is preferable that the film thickness be equal to or greater than the concealment film thickness. In some cases, it may be heated by applying hot air or the like and dried by touch.
[0028]
Process (B)
In the step (B), a colorless and transparent liquid that does not dissolve the touch-dried coating film is applied on the touch-dried candidate colored coating film, and the colorless and transparent liquid is applied on the colored coating film. This is a step of placing a colorless, transparent and solid thin film through a liquid, and is the same step as step (2) in the measurement method of the present invention.
[0029]
Process (C)
Step (C) is a step of measuring the color of the colored paint coating film from above the colorless transparent solid film, and is the same as step (3) in the measurement method of the present invention.
[0030]
Process (D)
Step (D) is a step of correcting the blending of candidate colored paints based on the measurement result of the color of the colored paint coating film in step (C).
[0031]
Although it is possible to correct the blending of the colored paint by visually measuring the color and taking into consideration, the blending calculation is performed by a computer that measures the color with a colorimeter and operates the color matching calculation logic based on the measured value. It is preferable to correct the blending of the candidate colored paint and bring it closer to the standard multi-layer coating color to be matched.
[0032]
The said process (A), (B), (C) and (D) is repeatedly performed until the measurement result of the color of this coloring coating-film in process (C) passes.
[0033]
When toning a paint for forming a colored coating film in a multilayer coating film of a colored coating film and a colorless clear coating film by the toning method of the present invention, the toning progress coating plate in a short time and with high accuracy The color of this paint film can be predicted, and the measured color shows good consistency with the paint color of the multi-layer paint film obtained by applying the color paint and setting, then applying the clear paint and baking. The toning time can be shortened.
[0034]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not limited to an Example.
[0035]
Example 1
Using the primary color of Retan PG2K (manufactured by Kansai Paint Co., Ltd., acrylic urethane resin paint for automobile repair), based on the registered basic composition of automobile body color A (silver metallic color), it is blended in the proportions shown in Table 1 below. A paint was obtained.
[0036]
Table 1 Car body color A
The obtained colored paint was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving to stand at 20 ° C. for 5 minutes to dry with the touch, a colorless and transparent liquid A [a mixture of n-heptane / LA solvent (Note 1) = 1/2 (weight ratio)] was applied to a 10 cm × 10 cm coated plate. 1 g was applied, and then a colorless transparent urethane clear film having a thickness of about 70 to 100 μm, which was an isolated coating film from the urethane clear paint, was applied thereon to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0038]
(Note 1) LA solvent: Made by Nippon Oil Co., Ltd., high boiling point hydrocarbon solvent, naphthene, paraffin.
[0039]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 2 below.
[0040]
Table 2
In addition, based on the conventional process, the same colored paint as above is applied on the tin plate in the same manner, and after setting for about 5 minutes, the cured film thickness of “Letan PG2K Clear” manufactured by Kansai Paint Co., Ltd. is about 50 μm. After coating as such and drying at 60 ° C. for 30 minutes, color measurement was performed in the same manner as described above using a “Van-VanFA sensor”. The results were as shown in Table 3 below.
[0042]
Table 3
As a result of comparing and examining the data in Table 2 and the data in Table 3 and visually judging each of the prepared coated plates, there is no significant difference, and the process of applying a colored paint touch-to-touch coating to colorless transparent liquid to urethane clear film The measurement coating plate by can be used as a substitute for the measurement coating plate by the process of the conventional colored coating, urethane clear coating and forced drying.
[0044]
Example 2
A primary color of letan PG2K was used and blended in the proportions shown in Table 4 below based on the registered basic blend of automobile body color B (blue pearl color) to obtain a colored paint.
[0045]
Table 4 Car body color B
The obtained colored paint was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving to dry at the temperature of 20 ° C. for 5 minutes, about 1 g of the colorless and transparent liquid A used in Example 1 was applied to a 10 cm × 10 cm coated plate, and subsequently used in Example 1 above. A colorless and transparent urethane clear film having a thickness of about 70 to 100 μm was pasted to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0047]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 5 below.
[0048]
Table 5
In addition, based on the conventional process, the same colored paint as above is applied on the tin plate in the same manner, and after setting for about 5 minutes, “Letan PG2K Clear” manufactured by Kansai Paint Co., Ltd. has a cured film thickness of about 50 μm. After coating as such and drying at 60 ° C. for 30 minutes, color measurement was performed in the same manner as described above using a “Van-VanFA sensor”. The results were as shown in Table 6 below.
[0050]
Table 6
As a result of comparing and examining the data in Table 5 and the data in Table 6 and visually judging each of the prepared coated plates, there is no significant difference, and the process of applying the colored paint to the touch-dried coating to the colorless transparent liquid to applying the urethane clear film The measurement coating plate by can be used as a substitute for the measurement coating plate by the process of the conventional colored coating, urethane clear coating and forced drying.
[0052]
Example 3
Using a primary color of letan PG2K, a colored paint was obtained by blending at a ratio shown in Table 7 below based on a registered basic blend of an automobile body color C (red pearl color).
[0053]
Table 7 Car body color C
The obtained colored paint was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving to dry at the temperature of 20 ° C. for 5 minutes, about 1 g of the colorless and transparent liquid A used in Example 1 was applied to a 10 cm × 10 cm coated plate, and subsequently used in Example 1 above. A colorless and transparent urethane clear film having a thickness of about 70 to 100 μm was pasted to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0055]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 8 below.
[0056]
Table 8
In addition, based on the conventional process, the same colored paint as above is applied on the tin plate in the same manner, and after setting for about 5 minutes, “Letan PG2K Clear” manufactured by Kansai Paint Co., Ltd. has a cured film thickness of about 50 μm. After coating as such and drying at 60 ° C. for 30 minutes, color measurement was performed in the same manner as described above using a “Van-VanFA sensor”. The results were as shown in Table 9 below.
[0058]
Table 9
As a result of comparing and examining the data in Table 8 and the data in Table 9, and visually judging each of the prepared coated plates, there is no significant difference, and the process of applying a colored paint touch-to-touch coating to colorless transparent liquid to applying urethane clear film The measurement coating plate by can be used as a substitute for the measurement coating plate by the process of the conventional colored coating, urethane clear coating and forced drying.
[0060]
About apparatus used and measuring method In each of the following examples, the measurement of the coating color such as the reference color to which the coating color of the paint should be matched by toning is measured by a multi-angle colorimeter “manufactured by Kansai Paint Co., Ltd.” Using a “Van-VanFA sensor”, colorimetric values were obtained by measuring under the three angle conditions of 25 °, 45 ° and 75 ° between the specular reflection axis and the light receiving axis. In addition, color characteristic data of a plurality of primary color paints are registered, and a computer color matching device manufactured by Kansai Paint Co., Ltd. is used as a computer on which each paint composition and color matching calculation logic using each data operates. Toning was performed using a “Van-VanFA station”.
[0061]
Example 4
Toning of car body color D (gray pearl color) was performed using the primary color of letan PG2K.
[0062]
First, the color of the body color D to be toned is measured using a multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd. under three angle conditions of 25 °, 45 ° and 75 °. Went. The results were as shown in Table 10 below.
[0063]
Table 10
Next, using the colorimetric values in Table 10, a computer color matching device “Van-VanFA station” manufactured by Kansai Paint Co., Ltd. was used to search for the closest formulation and add a correction to bring the color. As the first toning candidate color composition, the colored paint composition shown in Table 11 was obtained.
[0065]
Table 11
The colored paint obtained by blending in Table 11 was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving to dry at the temperature of 20 ° C. for 5 minutes, about 1 g of the colorless and transparent liquid A used in Example 1 was applied to a 10 cm × 10 cm coated plate, and subsequently used in Example 1 above. A colorless and transparent urethane clear film having a thickness of about 70 to 100 μm was pasted to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0067]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 12 below.
[0068]
Table 12
Based on the colorimetric values in Table 12, when using the “Van-VanFA station” manufactured by Kansai Paint Co., Ltd., an inquiry was made for a correction formulation that brings colors, the formulation in Table 13 was used as the second toning candidate color formulation. Acquired.
[0070]
Table 13
The colored paint obtained by blending in Table 13 was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving to dry at the temperature of 20 ° C. for 5 minutes, about 1 g of the colorless and transparent liquid A used in Example 1 was applied to a 10 cm × 10 cm coated plate, and subsequently used in Example 1 above. A colorless and transparent urethane clear film having a thickness of about 70 to 100 μm was pasted to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0072]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 14 below.
[0073]
Table 14
According to the colorimetric values and visual evaluation in Table 14, the color shift of the second toning candidate color was at a level at which it was determined that it could be sufficiently painted.
[0075]
Separately, the 2nd toning candidate color paint is spray-coated on the substrate (tinplate) so that the dry film thickness is about 20 μm, and after setting for about 5 minutes, “Retan” manufactured by Kansai Paint Co., Ltd. For the coated plate by the conventional process in which “PG2K clear” was coated to a cured film thickness of about 50 μm and dried at 60 ° C. for 30 minutes, color measurement was performed in the same manner as described above using “Van-VanFA sensor”. The results are as shown in Table 15 below, and the color difference ΔE from the reference plate is also described.
[0076]
Table 15
Also from the colorimetric values and visual evaluation in Table 15, the color shift of the second toning candidate color is determined to be sufficiently paintable, and this second toning candidate color is the tone of the car body color D. It could be used as a color paint color.
[0078]
Example 5
Using the primary color of letan PG2K, toning of the car body color E (blue pearl color) was carried out.
First, the color of the body color E to be toned is measured using a multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd. under three angle conditions of 25 °, 45 ° and 75 °. Went. The results were as shown in Table 16 below.
[0079]
Table 16
Next, using the colorimetric values shown in Table 16, using the “Van-VanFA station” manufactured by Kansai Paint Co., Ltd., the closest formula was searched for and the first adjustment was performed with corrections to correct the color. The color coating composition shown in Table 17 was obtained as a color candidate color composition.
[0081]
Table 17
The colored paint obtained by the formulation shown in Table 17 was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving to dry at the temperature of 20 ° C. for 5 minutes, about 1 g of the colorless and transparent liquid A used in Example 1 was applied to a 10 cm × 10 cm coated plate, and subsequently used in Example 1 above. A colorless and transparent urethane clear film having a thickness of about 70 to 100 μm was pasted to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0083]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 18 below.
[0084]
Table 18
Based on the colorimetric values shown in Table 18, using the “Van-VanFA station” manufactured by Kansai Paint Co., Ltd., when inquiring about a modified formulation that brings colors, the second toning candidate color formulation shown in Table 19 below The formulation was acquired.
[0086]
Table 19
The colored paint obtained by the formulation shown in Table 19 was spray-coated on a substrate (tinplate) so that the dry film thickness was about 20 μm. After leaving for 5 minutes at 20 ° C. to dry to the touch, about 1 g of colorless and transparent liquid A was applied to a 10 cm × 10 cm coated plate, followed by a colorless and transparent urethane clear having a thickness of about 70 to 100 μm. A film was affixed to obtain a measurement coating plate. The obtained measurement coating plate had no air bubbles between the colored coating film and the urethane clear film.
[0088]
Using the multi-angle colorimeter “Van-VanFA sensor” manufactured by Kansai Paint Co., Ltd., color measurement was performed on the measurement coating plate under the three-angle conditions of 25 °, 45 °, and 75 °. The results were as shown in Table 20 below.
[0089]
Table 20
According to the colorimetric values and visual evaluation in Table 20, the color shift of the second toning candidate color was at a level at which it was determined that it could be sufficiently painted.
[0091]
Separately, the 2nd toning candidate color paint is spray-coated on the substrate (tinplate) so that the dry film thickness is about 20 μm, and after setting for about 5 minutes, “Retan” manufactured by Kansai Paint Co., Ltd. For the coated plate of the conventional process in which “PG2K clear” was coated to a cured film thickness of about 50 μm and dried at 60 ° C. for 30 minutes, color measurement was performed in the same manner as described above using the “Van-VanFA sensor”. The results are as shown in Table 21 below, and the color difference ΔE from the reference version is also described.
[0092]
Table 21
Also from the colorimetric values and visual evaluation in Table 21, the color shift of the second toning candidate color is determined to be sufficiently paintable, and this second toning candidate color is the tone of the car body color E. It could be used as a color paint color.
[0094]
【The invention's effect】
According to the method for measuring the color of the colored coating film in the present invention, a measurement result that is in good agreement with the method for measuring the color of the colored progress coating plate in the conventional method can be obtained. Therefore, according to the toning method of the present invention using this measuring method, the toning of the colored paint forming the colored coating film in the multilayer of the colored coating film and the clear coating film can be accurately performed in a short time. .
Claims (5)
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| JP2000155681A JP4410383B2 (en) | 2000-05-26 | 2000-05-26 | Method for measuring color of colored paint coating film and method for toning colored paint using this measurement method |
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| JP2000155681A JP4410383B2 (en) | 2000-05-26 | 2000-05-26 | Method for measuring color of colored paint coating film and method for toning colored paint using this measurement method |
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