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JP3604075B2 - Correction method of ink mixing ratio - Google Patents
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JP3604075B2 - Correction method of ink mixing ratio - Google Patents

Correction method of ink mixing ratio Download PDF

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Publication number
JP3604075B2
JP3604075B2 JP34510099A JP34510099A JP3604075B2 JP 3604075 B2 JP3604075 B2 JP 3604075B2 JP 34510099 A JP34510099 A JP 34510099A JP 34510099 A JP34510099 A JP 34510099A JP 3604075 B2 JP3604075 B2 JP 3604075B2
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ink
mixture
white pigment
color
value
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JP2001164155A (en
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和雄 佐野
長谷川  隆
春雄 山口
文義 斉藤
淳夫 小林
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Dainichiseika Color and Chemicals Mfg Co Ltd
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Dainichiseika Color and Chemicals Mfg Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、壁紙や建材フィルムなどの印刷物の工業生産において、見本印刷物に対する生産ロット印刷物の色の合致度を限度内にするために、CCM(コンピュータカラーマッチング)を用いて生産ロットインキ組成物の基準配合を簡便、且つ高精度に修正することができるインキ配合の修正方法に関する。
【0002】
【従来の技術】
壁紙や建材フィルムなどの印刷物を工業生産する場合、見本印刷物の標準インキ組成に基づいて、スケールアップされた生産ロットインキ組成物が現場の生産ラインに供給される。しかし、生産ロットインキ組成物は標準組成物と同一のインキ配合であるものの、生産毎に使用される各インキのロットの差に起因して生産される印刷物に微妙な色の差が生じることがある。
【0003】
従来より、見本印刷物に対する生産ロット印刷物の色の合致度を限度内にするために、生産ロットインキ組成物の基準配合を修正することが行われている。この場合、色を評価するサンプルは小型試験印刷機で行い、見本印刷物と生産ロット印刷物の色の比較で行っていた。この比較は、人間の目で行う視感調色方法と各印刷物の分光反射率から計算される表色値などの差で比較しインキ配合を修正するCCMを利用した方法がある。視感調色方法で生産ロットインキ組成物の基準配合を修正する場合、最終印刷物と近似した条件で色を評価する必要があるため、生産条件に近い小型試験印刷機を使用して行っていた。
【0004】
【発明が解決しようとする課題】
しかしながら、この小型試験印刷機は、ドクター角の調整や、版の置き方、インキの量などの条件の設定が煩雑で難しい。また、同じ配合インキを繰り返し印刷しても、被印刷物に対するインキの転移量に誤差が生じて濃度の誤差が無視できない程存在し、正確な印刷再現性を得ることが難しい。また、CCM法を利用した方法においても、同様に小型試験印刷機が使用されるため、上記のような元来小型試験印刷機が保有する誤差を生じ、正確な補正配合が得られないという問題がある。
【0005】
これを解決するものとして、小型試験印刷機を使用せず、インキ組成物を直接測定する方法があるが、これは水などの希釈剤で希釈したインキ組成物の透過率を測定するもので、インキの粒子による光散乱の影響があり充分な精度が得られないという問題がある。
【0006】
従って、本発明の目的は、壁紙や建材フィルムなどの印刷物の工業生産において、見本印刷物に対する生産ロット印刷物の色の合致度を限度内にするために、小型試験印刷機を使用することなく、CCMを用いて生産ロットインキ組成物の基準配合を簡便、且つ高精度に修正することができるインキ組成物の配合比率の修正方法を提供することにある。
【0007】
【課題を解決するための手段】
かかる実情において、本発明者らは鋭意検討を行った結果、白色紙に印刷された印刷物の反射光の測定による比較ではなく、透明セルに入れられたインキ成分と白顔料物の混合物の反射光の測定による比較で行えば、生産ロットインキ組成物の基準配合を簡便、且つ高精度に修正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。
【0008】
すなわち、本発明は、白顔料を除く複数のインキと希釈液部からなる生産ロットインキ組成物の前記複数のインキのインキ配合比率を既に調色されてインキ配合比率が既知である標準インキ組成物との比較において、白顔料物を希釈剤としたCCMデータベースを用いたCCMにより修正する方法であって、前記生産ロットインキ組成物のインキと白顔料物の混合物Aと、前記標準インキ組成物のインキと白顔料物の混合物Bとを調製し、前記混合物Aの反射光から算出される表色値Aと前記混合物Bの反射光から算出される表色値Bを求め、表色値Aと表色値Bの差と、予め各インキと白顔料物の混合物の分光反射率から計算されたCCMデータベース内の基礎データとを比較し、該CCMから算出された白顔料物を含む修正配合から白顔料物を希釈液部に置き換えることにより、前記生産ロットインキ組成物の複数インキのインキ配合比率を修正することを特徴とするインキの配合比率の修正方法(以下、「第1の方法」とも言う)を提供するものである。
【0009】
また、本発明は、白顔料を除く複数のインキと希釈液部からなる生産ロットインキ組成物の前記複数のインキのインキ配合比率を既に調色されてインキ配合比率が既知である標準インキ組成物との比較においてCCMにより修正する方法であって、前記生産ロットインキ組成物と白顔料物の混合物Cと、前記標準インキ組成物と白顔料物の混合物Dとを調製し、前記混合物Cの反射光から算出される表色値Cと前記混合物Dの反射光から算出される表色値Dを求め、表色値Cと表色値Dの差と、予め各インキ、希釈液部及び白顔料物の混合物の分光反射率から計算されたCCMデータベース内の基礎データとを比較することにより、前記生産ロットインキ組成物の複数インキのインキ配合比率を修正することを特徴とするインキの配合比率の修正方法(以下、「第2の方法」とも言う)を提供するものである。
【0010】
【発明の実施の形態】
本発明において、標準インキ組成物は、例えば顧客との間で決定された見本印刷物を印刷したインキ組成物であり、通常、黄インキ、赤インキ及び青インキ等の各種のインキと希釈液部からなり、該希釈液部は樹脂(バインダ)と希釈剤から構成されている。樹脂としては、例えば、硝化綿、ポリアミド、塩化ビニル等が挙げられ、希釈剤としては、例えば、水及び酢酸エチル、MEK、ブチルセルロース等が挙げられる。
【0011】
本発明において、生産ロットインキ組成物は、前記標準インキ組成物と同一組成物であり、多量の印刷に応じるため、生産ラインに供給するインキ組成物である。通常、生産ロットインキ組成物に配合される各種インキは、標準インキ組成物を作成した時のインキとロットが異なるため、生産ロットインキ組成物で印刷された印刷物と見本印刷物は微妙に色が異なる。
【0012】
本発明において使用されるCCMは、公知のものが使用でき、例えば分光測色計とパソコンを結合させたものが使用される。分光測色計はJIS Z 8722( 物体色の測定方法) に従って測定可能なものであり、少なくとも連続スペクトルを有する光源を有し、この光源を測定体に照射して400 〜700nm の可視光領域の分光反射率を測定できるものである。また、混合物Aと混合物Bとの表色値差及び混合物Cと混合物Dとの表色値差を得るには分光測色計の代わりに、色彩計や色差計を利用したものであってもよい。
【0013】
本発明において使用される混合物Aは、生産ロットインキ組成物のインキと白顔料物とが均一に混合されたものである。すなわち、生産ロットインキ組成物中、黄色、赤色及び青色などのインキ成分以外の希釈液部を白顔料物に置き換えたものである。また、本発明において使用される混合物Cは、生産ロットインキ組成物と規定量の白顔料物とが均一に混合されたものである。白顔料物は、混合物A又は混合物Cの反射光の分光反射率が20〜60%となるような配合割合とすることが、補正精度がよくなる点で好ましい。
【0014】
白顔料物としては、白顔料単独又は白顔料を含有する白インキが使用される。白インキは、通常、白顔料、樹脂(バインダー)及び希釈剤が配合されている。白顔料としては、二酸化チタン、硫酸バリウム、三酸化アンチモンなどが挙げられる。これら白顔料の適宜の配合使用により、インキ混合物への光照射光が測光径から逃げず、適度な隠蔽性を持ち反射光を測定できる。また、樹脂としては、例えば、硝化綿、ポリアミド、塩化ビニル等が挙げられ、希釈剤としては、例えば、水及び酢酸エチル、MEK、ブチルセルロース等が挙げられる。
【0015】
本発明において使用される混合物Bは、標準インキ組成物のインキと白顔料物とが均一に混合されたものである。すなわち、生産ロットインキ組成物と同様、標準インキ組成物中、黄色、赤色及び青色などのインキ成分以外の希釈液部を白顔料物に置き換えたものである。また、本発明において使用される混合物Dは、標準インキ組成物と規定量の白顔料物とが均一に混合されたものである。白顔料物は、前記と同様、混合物B又は混合物Dの反射光の分光反射率が20〜60となるような配合割合とすることが、補正精度がよくなる点で好ましい。
【0016】
次に、第1の方法では混合物Aの反射光から算出される表色値Aと、混合物Bの反射光から算出される表色値Bを求め、表色値Aと表色値Bの差を求める。また、第2の方法では、混合物Cの反射光から算出される表色値Cと、混合物Dの反射光から算出される表色値Dを求め、表色値Cと表色値Dの差を求める。この表色値A及び表色値Bの求め方、あるいは表色値C及び表色値Dの求め方は同じであるため、混合物Aの反射光から算出される表色値Aの求め方についてのみ説明する。先ず、混合物Aを透明セルに入れる。次いで、透明セルの混合物Aを分光光度計を用いて測定し、その反射光から表色値Aを算出する。反射光から表色値Aを算出する方法としては、例えば混合物Aの反射率を分光光度計によって、可視光領域に亘り計測し、JIS Z8701色の表示方法(XYZ表色系及びX101010表色系)により三刺激値X、Y、Zを求める方法、あるいは、混合物Aの反射光を色彩計や色差計で計測し、三刺激値X、Y、Zを求める方法等が挙げられる。
【0017】
本発明の第1の方法において、上記混合物Aと混合物Bの各反射光の測定とは別に、予め各インクと白顔料物の混合物(サンプル)の分光反射率から計算されたCCM計算用の係数を基礎データとして作成し、コンピュータに入力しておく。インクと白顔料物の混合物としては、例えば、生産ロットインキ組成物で使用される黄インキ、赤インキ及び青インキなどの各インキと白顔料物の混合物であり、インキの配合量は混合物中、0.1〜40重量%、好ましくは0.5〜20重量%とすることが、印刷物が壁紙を想定した明度の高い色から建材フィルムを想定した明度の低い色までをカバーする点で好ましく、また、サンプル数としては、上記範囲間で等間隔配合の3〜10個とすることが、精度と作業効率の双方の点で好ましい。次で、混合物(サンプル)を透明セルに入れる。次いで、透明セルの混合物を分光光度計によって、可視光領域に亘り計測し、後述するクベルカ・ムンクの式により、吸収係数と散乱係数の比をもって光学濃度とするK/S値に変換する。各インキの単位重量当たりの三刺激値X、Y、Zの変化量は後述する式(4)中、∂X/∂C、∂X/∂C、∂X/∂C、∂Y/∂C、∂Y/∂C、∂Y/∂C、∂Z/∂C、∂Z/∂C、∂Z/∂Cに相当するものであり、具体的には、例えば上記偏微分係数のCは黄インキであり、Cは赤インキであり、Cは青インキである。また、第2の方法の場合も同様に、予め各インキ、希釈液部及び白顔料物の混合物(サンプル)の分光反射率から計算されたCCM計算用の係数を基礎データとして作成し、コンピュータに入力しておく。この場合、インキ、希釈液部と白顔料物の混合物としては、例えば生産ロットインキ組成物で使用される黄インキ、赤インキ、青インキなどの各インキと希釈液部と白顔料物の混合物であり、インキと希釈液部の合計量100重量部に対し、白顔料物を規定量、例えば100重量部を混合したものを、インキ配合量が等間隔配合で異なる3〜10個のサンプルを用意し、且つ白顔料物100重量部を200、300、400又は500重量部としたサンプルを同様の数だけ用意しておけばよい。この場合、CCMの修正計算は白顔料物の量(規定量)が同量の基礎データが選択される。この第2の方法の場合、各インキと希釈液部を含む系で測定するため、希釈液部の量を直接計算できる利点がある反面、上記のように、基礎データを多数用意する必要がある点で不利である。
【0018】
次いで、表色値Aと表色値Bの差と、あるいは表色値Cと表色値Dの差前記混合物(サンプル)の分光反射率から計算された基礎データとに基づき三刺激値の差を小さくするような収斂計算により、前記生産ロットインキ組成物のインキ配合比率及び希釈液量をCCMを用いて修正する。具体的には、白顔料を希釈液部として扱い、CCMから算出された白顔料を含む配合から白顔料を希釈液部に置き換えることにより、あるいは第2の方法では置き換えることなく直接的に行う。このように、印刷物の反射光ではなく、インキと白顔料物との混合物の反射光の直接測定による比較が可能となるのは次の理由による。すなわち、インキに白顔料物を混合した場合、混合物の発色原理は白顔料の散乱による白色成分と、インキの光吸収の合成である。この場合、後述するCCMの混色理論を使用すれば、規定量の白顔料の散乱効果を差し引くことができる。標準インキ組成物と生産ロットインキ組成物はそれぞれが構成する染料または顔料は同一組成であり、従って、標準インキ組成物の見本印刷物と生産ロットインキ組成物の印刷物の色の差と、標準インキ組成物のインキと白顔料物との混合物と生産ロットインキ組成物のインキと白顔料物との混合物の色の差は、同一傾向となるからである。
【0019】
本発明の第1の方法において、CCMからは、CCMで算出されたインキの修正量及び白顔料物の修正量が出力される。白顔料物の修正量は、次式(1);
換算した希釈液部の量=a×b/混合した白顔料物の量 (1)
(式中、aは生産ロットインキ組成物中の希釈液部の量を示し、bはCCMで算出された白顔料物の修正量を示す。)で示される換算式で希釈液部の量に換算されるから、白顔料物部分を希釈液部に置き換えると共に、上記(1)式から得られる換算量で修正すればよい。また、生産ロットインキ組成物は混合物であるため特定インキの特定量を除去することはできず、常にインキ配合比率は加算修正である。従って、例えば、赤インキを減らしたい場合は赤インキはそのままとし、赤インキ以外の成分が追加される。
【0020】
次に、CCMの混色理論を下記に示す。このCCMの混色理論は、例えば「新編色彩科学ハンドブック」東京大学出版会、第15章「混色と色合わせ」第567 頁〜第570 頁の記載が参考となる。例えば、測定物の反射率を分光光度計により計測してクベルカ・ムンクの式(2)から、吸収係数と散乱係数の比をもって光学濃度とするK/S値に変換する。
K/S=(1−R)/2R (2)
(式中、Rは測定物の分光反射率、Kは波長ごとの測定物の吸収係数、Sは波長ごとの散乱係数をそれぞれ示す。)
【0021】
基礎データを作成する場合、それぞれのインキを規定量計量し、そのインキ混合物の分光反射率を測定し、式(2)から各インキの単位重量当たりのK/S値を表すFn値を事前に登録しておく(式(2’))。複数のインキを混合する場合、その混合インキでの測定物の波長毎の(K/S)mix 値は式(3)で算出される。式(3)は任意のインキ配合を与えれば(K/S)mix 値が求まり、式(2)によって分光反射率が求められる。さらに分光反射率から三刺激値X、Y、Zが求められ(例えば、JIS Z8701 「反射による物体色の三刺激値」参照)、各インキ単位重量当たりのX、Y、Zの変動量である式(4)で使用される偏微分係数が求められる。
Fn=((K/S)−(K/S))/C (2’)
(式中、nはインキ名、(K/S)は測定物の分光反射率を上記(2)式に代入して得られるK/S値、(K/S)は測定物が印刷物の場合、被印刷物(紙)のK/S値をそれぞれ示す。)
(K/S)mix =F+・・・+F+(K/S) (3)
【0022】
すなわち、任意のインキ配合C (例えば、Cは黄インキ、Cは赤インキ、Cは青インキ)に対し、標準インキ組成物に近づけるためのインキ修正量は式(4)から求められる。ここで、混合物Bと混合物A又は混合物Dと混合物Cの三刺激値の差をΔX、ΔY、ΔZ、インキ1単位当たりの三刺激値の変動量を∂X/∂C 、∂Y/∂C 、∂Z/∂C 、インキの修正量をΔCとすると、次式(4)のマトリックスからインキの修正量ΔCが求められる。
【0023】

Figure 0003604075
【0024】
本発明は、標準インキ組成物及び生産ロットインキ組成物散乱力の大きい白色顔料物と混合し、その各々の反射光を測定し、CCMの混色理論によって算出された表色値の差から修正値を得、この修正値に基づいて、生産ロットインキ組成物のインキの配合比率及び希釈液量の変更を行うものである。従来、小型印刷機で印刷した印刷物の分光反射率を測定する際、小型印刷機のインキ転移量を厳密に再現することは困難であり、このインキ転移量は主に色の明度に影響を及ぼすため、求められたインキ修正量も明度を合致させることが難しかったが、本発明では、小型印刷機を使用することなく、CCMを用いて生産ロットインキ組成物の基準配合を簡便、且つ高精度に修正することができる。
【0025】
【実施例】
次に、実施例を挙げて本発明を更に具体的に説明するが、これは単に例示であって、本発明を制限するものではない。
実施例1
下記のインキ、小型印刷機、CCM装置を準備した。
(インキ)
・黄インキ:49黄(「ハイドリックWP49黄」大日精化工業(株)製)
・赤インキ:16赤(「ハイドリックWP16赤」大日精化工業(株)製)
・青インキ:63青(「ハイドリックWP63青」大日精化工業(株)製)
・白インキ:白インキ04白(「ハイドリックWP04白」大日精化工業(株)製)
・希釈液部:VS−EXT(「ハイドリックVSエクステンダー」大日精化工業(株)製)80重量%と水20重量%の混合液
(小型印刷機)
・Kプリンティングプルーファー印刷機(松尾産業(株)製)
(CCM装置)
・カラコム・CCMシステム2002分光光度計型(大日精化工業(株)製)
【0026】
(CCM基礎データの作成)
次に、配合に使用される黄インキ、赤インキ、青インキそれぞれの分光反射率をコンピュターのメモリ上に記憶させるため、表1に示す配合組成のCCM基礎データ作成用サンプルを合計18個調製した。表1中、配合数値は重量%を示す。このサンプルは透明セルに入れ、各々の分光反射率を測定し、各インクのK/S関数、つまり単位重量当たりのK/S値として事前登録した。黄インキサンプルの分光曲線を図1に、赤インキサンプルの分光曲線を図2に、青インキサンプルの分光曲線を図3にそれぞれ示す。図中、縦軸は分光反射率(%)である。
【0027】
【表1】
Figure 0003604075
【0028】
(混合物(測定インキ)の調製)
次に、標準インキのインキ成分と白インキの混合物(ここでは「正解配合」とする)及び意図的に正解配合と異なるインキ配合の混合物(ここでは「基準配合」とする)を表2〜表4に示す混合量(g)で調製した。試料1〜4は、壁紙を想定した明度が高いサンプルであり、試料5〜7は建材用途を想定した明度が低いサンプルである。なお、白インキの配合量は420〜680nmの波長範囲で分光反射率が20%〜60%の範囲に入るように試料1〜4では150gとし、試料5〜7では630gとした。正解配合の混合物と基準配合の混合物はそれぞれ各試料毎に別々の透明セルに入れ、その反射光の分光反射率を測定した。試料1〜7の正解配合混合物の反射光の分光曲線を図4に、試料1〜7の正解配合及び基準配合混合物の表色値と色差を表5にそれぞれ示した。表色値の測定方法はJIS Z 8722物体色の測定方法に準拠した。数値はD65イルミナント、10度視野Lである。なお、試料1〜7の基準配合混合物の反射光の分光曲線は、図では省略するが分光曲線で見る限り図4とほとんど同じである。
【0029】
【表2】
Figure 0003604075
【0030】
【表3】
Figure 0003604075
【0031】
【表4】
Figure 0003604075
【0032】
【表5】
Figure 0003604075
【0033】
次に、得られた正解配合の混合物と基準配合の混合物の反射光の分光反射率から三刺激値の差ΔX、ΔY、ΔZを求め、式(4)から各インキの修正量を求め、各試料の基準配合のインキ配合比率及び希釈液量を修正した。結果を表11〜表14に示す。
【0034】
比較例1
標準インキ組成物(ここでは「正解組成」とする)で白色紙に印刷された印刷物及び意図的に正解組成と異なるインキ配合のインキ組成物(ここでは「基準組成」とする)で白色紙に印刷された印刷物の反射光を測定し、CCM理論を利用して基準組成のインキ配合比率を修正した。また、予め印刷用CCM基礎データの作成をした。
【0035】
(印刷用CCM基礎データの作成)
先ず、表6に示す配合組成のCCM基礎データ作成用インキ組成物を合計18個調製した。表6中、配合数値は重量%を示す。このインキ組成物は小型印刷機により白色紙に印刷され、この印刷物各々の分光反射率を測定し、各印刷物のK/S関数、つまり単位重量当たりのK/S値を事前登録した。黄インキサンプルの分光曲線を図5に、赤インキサンプルの分光曲線を図6に、青インキサンプルの分光曲線を図7にそれぞれ示す。図中、縦軸は分光反射率(%)である。
【0036】
【表6】
Figure 0003604075
【0037】
(印刷用インク組成物の調製及び印刷物の作成)
表7〜表9に示す正解組成及び基準組成の各配合インキ組成物を小型試験印刷機用いて、白色紙に印刷物を印刷した。表中、試料8〜試料11は壁紙を想定した明度が高いサンプルであり、試料12〜14は建材用途を想定した明度が低いサンプルである。試験は印刷物の反射光を測定した。試料8〜14の正解組成の印刷物の反射光の分光曲線を図8に示した。また、各試料の正解組成及び基準組成による印刷物の表色値と色差を表10にそれぞれ示した。表色値の測定方法はJIS Z 8722物体色の測定方法に準拠した。数値はD65イルミナント、10度視野Lである。なお、試料8〜14の基準組成の印刷物の反射光の分光曲線は図では省略するが分光曲線で見る限り、図8と同様である。
【0038】
次いで、正解組成の印刷物と基準組成の印刷物の反射光の分光反射率から三刺激値の差ΔX、ΔY、ΔZを求め、式(4)から各インキの修正量を求め、各基準配合のインキ配合比率及び希釈液を修正した。結果を表11〜表14に示す。
【0039】
【表7】
Figure 0003604075
【0040】
【表8】
Figure 0003604075
【0041】
【表9】
Figure 0003604075
【0042】
【表10】
Figure 0003604075
【0043】
【表11】
Figure 0003604075
【0044】
【表12】
Figure 0003604075
【0045】
【表13】
Figure 0003604075
【0046】
【表14】
Figure 0003604075
【0047】
表11〜表14中、「追加正解配合」欄の数値は各試料における「正解配合(組成)」から「基準配合(組成)」を差し引いた値である。また、「白インキ」欄の括弧内の数値はCCMで算出された白インキの修正量(g)であり、「VS−EXT」欄の括弧内の数値は前記(1)式に上記白インキの修正量(g)を代入して得られた希釈液部(VS−EXT)の修正量(g)である。
【0048】
(修正配合されたインキ組成物の印刷物の表色値の比較)
上記実施例1及び比較例1で修正配合されたインキ組成物を用い白色紙に印刷物を印刷し、両者の印刷物の表色値を比較した。なお、印刷は小型印刷機を使用し、印刷条件でのインキ転移量が同一になるように正解配合組成物と修正配合組成物を版の上に置き、1回の印刷で両組成物を同時印刷してその表色値を測定した。結果を表15に示す。測定方法はJIS Z 8722物体色の測定方法に準拠した。数値はD65イルミナント、10度視野Lである。表15中、「標準」は標準インキ組成物による印刷物の表色値である。
【0049】
【表15】
Figure 0003604075
【0050】
表15から明らかなように、壁紙を想定した明度の高い試料1〜4(実施例)及び試料8〜11(比較例)では実施例の方が精度よい結果が得られた。また、建材用途を想定した明度の低い試料5〜7(実施例)及び試料12〜14(比較例)においても実施例の方が精度よい結果が得られた。
【0051】
【発明の効果】
本発明によれば、壁紙や建材フィルムなどの印刷物の工業生産において、見本印刷物に対する生産ロット印刷物の色の合致度を限度内にするために、小型試験印刷機を使用することなく、CCMを用いて生産ロットインキ組成物の基準配合を簡便、且つ高精度に修正することができる。
【図面の簡単な説明】
【図1】CCM基礎データ用白インキ配合49黄インキの反射光の分光曲線を示す。
【図2】CCM基礎データ用白インキ配合16赤インキの反射光の分光曲線を示す。
【図3】CCM基礎データ用白インキ配合63青インキの反射光の分光曲線を示す。
【図4】試料1〜7の正解配合物の反射光の分光曲線を示す。
【図5】CCM基礎データ用49黄インキ組成物の印刷物の反射光の分光曲線を示す。
【図6】CCM基礎データ用16赤インキ組成物の印刷物の反射光の分光曲線を示す。
【図7】CCM基礎データ用63青インキ組成物の印刷物の反射光の分光曲線を示す。
【図8】試料1〜7の正解配合物の印刷物の反射光の分光曲線を示す。[0001]
BACKGROUND OF THE INVENTION
In the industrial production of printed materials such as wallpaper and building material film, the present invention uses CCM (Computer Color Matching) to produce a production lot ink composition in order to limit the degree of color matching of the production lot printed matter to the sample printed matter. The present invention relates to a method for correcting an ink composition that can easily and accurately correct a reference composition.
[0002]
[Prior art]
In the case of industrial production of printed matter such as wallpaper and building material film, a scaled-up production lot ink composition is supplied to the production line on the site based on the standard ink composition of the sample printed matter. However, although the production lot ink composition has the same ink composition as the standard composition, a subtle color difference may occur in the printed matter produced due to the difference in the lot of each ink used for each production. is there.
[0003]
Conventionally, in order to make the degree of matching of the color of the production lot printed product with respect to the sample printed product within the limit, the standard composition of the production lot ink composition is corrected. In this case, the sample for color evaluation was performed on a small test printing machine, and the comparison was made between the color of the sample print and the production lot print. This comparison includes a visual toning method that is performed by the human eye and a method that uses a CCM that corrects the ink composition by comparing the difference in color values calculated from the spectral reflectance of each printed matter. When correcting the standard composition of the production lot ink composition with the visual toning method, it was necessary to evaluate the color under conditions that were close to the final printed matter, so it was done using a small test printing press that was close to the production conditions. .
[0004]
[Problems to be solved by the invention]
However, in this small test printing machine, it is difficult and difficult to set conditions such as doctor angle adjustment, plate placement, and ink amount. Even if the same blended ink is printed repeatedly, an error occurs in the transfer amount of the ink to the printing material and the density error cannot be ignored, and it is difficult to obtain accurate print reproducibility. Also, in the method using the CCM method, since a small test printing machine is used in the same manner, the above-mentioned error inherent in the small test printing machine occurs, and an accurate correction blend cannot be obtained. There is.
[0005]
As a solution to this, there is a method of directly measuring the ink composition without using a small test printing machine, but this is to measure the transmittance of the ink composition diluted with a diluent such as water, There is a problem that sufficient accuracy cannot be obtained due to light scattering by ink particles.
[0006]
Therefore, the object of the present invention is to use CCM without using a small test printing machine in order to limit the degree of color matching of the production lot print to the sample print in the industrial production of prints such as wallpaper and building material film. It is an object to provide a method for correcting the blending ratio of an ink composition that can easily and accurately correct the standard blending of a production lot ink composition.
[0007]
[Means for Solving the Problems]
In such a situation, the present inventors have intensively studied, and as a result, the reflected light of the mixture of the ink component and the white pigment substance placed in the transparent cell is not a comparison by measuring the reflected light of the printed matter printed on the white paper. It was found that the standard composition of the production lot ink composition can be corrected easily and with high accuracy by comparison by measurement of the above, and the present invention has been completed.
[0008]
That is, the present invention provides a standard ink composition in which the ink blending ratio of the plurality of inks in a production lot ink composition comprising a plurality of inks excluding white pigment and a dilute part is already toned and the ink blending ratio is known . And a CCM database using a CCM database with a white pigment material as a diluent , wherein the mixture A of the production lot ink composition and the white pigment material A and the standard ink composition A mixture B of ink and white pigment is prepared, and a color value A calculated from the reflected light of the mixture A and a color value B calculated from the reflected light of the mixture B are obtained. The difference between the color value B and the basic data in the CCM database calculated in advance from the spectral reflectance of the mixture of each ink and the white pigment product are compared , and the correction formula including the white pigment product calculated from the CCM is used. White face By replacing an object in a diluent unit, the correction method of the blending ratio of the ink, characterized by modifying the ink formulation ratio of multiple ink production lot ink composition (hereinafter, also referred to as "first method") Is to provide.
[0009]
In addition, the present invention provides a standard ink composition in which the ink blending ratio of the plurality of inks in a production lot ink composition comprising a plurality of inks excluding white pigment and a dilute part is already toned and the ink blending ratio is known And a mixture C of the production lot ink composition and white pigment material, and a mixture D of the standard ink composition and white pigment material, and the reflection of the mixture C. The color value C calculated from the light and the color value D calculated from the reflected light of the mixture D are obtained, the difference between the color value C and the color value D, and each ink, diluent part and white pigment in advance. by comparing the basic data in the calculated CCM database from the spectral reflectance of a mixture of objects, the blending ratio of the ink, characterized by modifying the ink formulation ratio of multiple inks of the production lot ink composition Positive way is to provide a (hereinafter also referred to as "second method").
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the standard ink composition is an ink composition obtained by printing, for example, a sample printed matter determined with a customer, and usually from various inks such as yellow ink, red ink, and blue ink, and a diluting liquid part. The dilution liquid part is composed of a resin (binder) and a diluent. Examples of the resin include nitrified cotton, polyamide, and vinyl chloride. Examples of the diluent include water, ethyl acetate, MEK, and butyl cellulose.
[0011]
In the present invention, the production lot ink composition is the same composition as the standard ink composition, and is an ink composition supplied to the production line in order to respond to a large amount of printing. Usually, the various inks blended in the production lot ink composition are different in lot from the ink when the standard ink composition is made, so the printed matter printed with the production lot ink composition and the sample printed matter are slightly different in color. .
[0012]
As the CCM used in the present invention, a known one can be used, for example, a combination of a spectrocolorimeter and a personal computer. The spectrocolorimeter can be measured according to JIS Z 8722 (object color measurement method), has a light source having at least a continuous spectrum, and irradiates the measurement body with the light source in a visible light region of 400 to 700 nm. Spectral reflectance can be measured. Further, in order to obtain the color difference between the mixture A and the mixture B and the color difference between the mixture C and the mixture D, a colorimeter or a color difference meter may be used instead of the spectrocolorimeter. Good.
[0013]
The mixture A used in the present invention is a mixture obtained by uniformly mixing the ink of the production lot ink composition and the white pigment product. That is, in the production lot ink composition, the diluted liquid portion other than the ink components such as yellow, red and blue is replaced with a white pigment. Further, the mixture C used in the present invention is a product obtained by uniformly mixing a production lot ink composition and a specified amount of white pigment. The white pigment is preferably blended so that the spectral reflectance of the reflected light of the mixture A or the mixture C is 20 to 60% because the correction accuracy is improved.
[0014]
As the white pigment product, a white pigment alone or a white ink containing a white pigment is used. The white ink usually contains a white pigment, a resin (binder), and a diluent. Examples of white pigments include titanium dioxide, barium sulfate, and antimony trioxide. By appropriately blending and using these white pigments, the light irradiation light to the ink mixture does not escape from the photometric diameter, and the reflected light can be measured with an appropriate concealing property. Examples of the resin include nitrified cotton, polyamide, and vinyl chloride. Examples of the diluent include water, ethyl acetate, MEK, and butyl cellulose.
[0015]
The mixture B used in the present invention is a mixture in which the ink of the standard ink composition and the white pigment are uniformly mixed. That is, as in the production lot ink composition, the diluted liquid part other than the ink components such as yellow, red and blue in the standard ink composition is replaced with a white pigment. The mixture D used in the present invention is a mixture of a standard ink composition and a specified amount of a white pigment that is uniformly mixed. As described above, it is preferable that the white pigment material has a blending ratio such that the spectral reflectance of the reflected light of the mixture B or the mixture D is 20 to 60 in terms of improving correction accuracy.
[0016]
Next, in the first method, the color value A calculated from the reflected light of the mixture A and the color value B calculated from the reflected light of the mixture B are obtained, and the difference between the color value A and the color value B is obtained. Ask for. Further, in the second method, the color value C calculated from the reflected light of the mixture C and the color value D calculated from the reflected light of the mixture D are obtained, and the difference between the color value C and the color value D is obtained. Ask for. Since the method of obtaining the color specification value A and the color specification value B or the method of obtaining the color specification value C and the color specification value D are the same, the method of obtaining the color specification value A calculated from the reflected light of the mixture A. Only explained. First, the mixture A is put into a transparent cell. Next, the transparent cell mixture A is measured using a spectrophotometer, and the color value A is calculated from the reflected light. As a method for calculating the colorimetric value A from the reflected light, for example, the reflectance of the mixture A is measured over the visible light region with a spectrophotometer, and a JIS Z8701 color display method (XYZ color system and X 10 Y 10 the method by Z 10 color system) determine the tristimulus values X, Y, Z or, the reflected light of the mixture a was measured with colorimeter and color difference meter, and a method is exemplified to obtain tristimulus values X, Y, and Z It is done.
[0017]
In the first method of the present invention, separately from the measurement of each reflected light of the mixture A and the mixture B, a coefficient for CCM calculation previously calculated from the spectral reflectance of the mixture (sample) of each ink and white pigment material Is created as basic data and input to the computer. As a mixture of ink and white pigment material, for example, a mixture of each ink and white pigment material such as yellow ink, red ink and blue ink used in the production lot ink composition, the blending amount of the ink in the mixture, 0.1 to 40% by weight, preferably 0.5 to 20% by weight is preferable in that the printed matter covers a color from a high lightness assuming a wallpaper to a low lightness assuming a building material film, In addition, the number of samples is preferably 3 to 10 with an equal interval blending between the above ranges in terms of both accuracy and work efficiency. The mixture (sample) is then placed in a clear cell. Next, the mixture of the transparent cells is measured over the visible light region with a spectrophotometer, and converted into a K / S value, which is an optical density based on the ratio of the absorption coefficient and the scattering coefficient, according to the Kubelka-Munk equation described later. The amount of change in the tristimulus values X, Y, and Z per unit weight of each ink is represented by ∂X / ∂C 1 , ∂X / ∂C 2 , ∂X / ∂C 3 , ∂Y in equation (4) described later. / ∂C 1 , ∂Y / ∂C 2 , ∂Y / ∂C 3 , ∂Z / ∂C 1 , ∂Z / ∂C 2 , ∂Z / ∂C 3 , specifically , for example C 1 of the partial derivatives is yellow ink, C 2 is red ink, C 3 is blue ink. Similarly, in the case of the second method, a coefficient for CCM calculation, which is calculated in advance from the spectral reflectance of each ink, diluent part and white pigment mixture (sample), is created as basic data and stored in the computer. Enter it. In this case, the mixture of the ink, the diluted liquid part and the white pigment material is, for example, a mixture of each ink such as yellow ink, red ink and blue ink used in the production lot ink composition, the diluted liquid part and the white pigment material. Yes, 3 to 10 samples with different amounts of ink blended at equal intervals are prepared by mixing a specified amount of white pigment, for example, 100 parts by weight with respect to 100 parts by weight of the total amount of ink and diluent In addition, a similar number of samples may be prepared in which 100 parts by weight of the white pigment material is 200, 300, 400, or 500 parts by weight. In this case, for the CCM correction calculation, basic data having the same amount of white pigment (a prescribed amount) is selected. In the case of the second method, since the measurement is performed in a system including each ink and the diluent portion, there is an advantage that the amount of the diluent portion can be directly calculated. However, as described above, it is necessary to prepare a lot of basic data. It is disadvantageous in terms.
[0018]
Then, Omoteirochi A and the difference Omoteirochi B, or Omoteirochi C and difference of said mixture of Omoteirochi D (samples) from the spectral reflectance of the calculated basic data and the basis tristimulus values The ink blending ratio and dilution liquid amount of the production lot ink composition are corrected using the CCM by convergence calculation so as to reduce the difference. Specifically, the white pigment is handled as a diluent part, and the white pigment is replaced with the diluent part from the formulation containing the white pigment calculated from the CCM, or directly without replacement in the second method. In this way, the comparison by direct measurement of the reflected light of the mixture of the ink and the white pigment material, not the reflected light of the printed material, becomes possible for the following reason. That is, when a white pigment is mixed with ink, the coloring principle of the mixture is the synthesis of the white component due to scattering of the white pigment and the light absorption of the ink. In this case, the scattering effect of a specified amount of white pigment can be subtracted by using the CCM color mixing theory described later. The standard ink composition and the production lot ink composition each have the same dye or pigment composition. Therefore, the color difference between the sample print of the standard ink composition and the print of the production lot ink composition and the standard ink composition This is because the color difference between the mixture of the product ink and the white pigment product and the mixture of the production lot ink composition and the white pigment product has the same tendency.
[0019]
In the first method of the present invention, the CCM outputs the ink correction amount and white pigment correction amount calculated by the CCM. The correction amount of the white pigment product is the following formula (1);
Amount of diluted liquid part converted = a × b / amount of mixed white pigment (1)
(In the formula, a represents the amount of the diluted liquid part in the production lot ink composition, and b represents the correction amount of the white pigment product calculated by CCM.) Since it is converted, the white pigment part may be replaced with the diluent part and corrected with the conversion amount obtained from the above equation (1). Further, since the production lot ink composition is a mixture, a specific amount of the specific ink cannot be removed, and the ink blending ratio is always an additive correction. Therefore, for example, when it is desired to reduce the red ink, the red ink is left as it is, and components other than the red ink are added.
[0020]
Next, the color mixing theory of CCM is shown below. For the CCM color mixing theory, for example, the description of “New Color Science Handbook”, University of Tokyo Press, Chapter 15 “Color Mixing and Color Matching”, pages 567 to 570 is helpful. For example, the reflectance of the object to be measured is measured with a spectrophotometer and converted from the Kubelka-Munk equation (2) into a K / S value that is an optical density with the ratio of the absorption coefficient to the scattering coefficient.
K / S = (1-R) 2 / 2R (2)
(In the formula, R represents the spectral reflectance of the measurement object, K represents the absorption coefficient of the measurement object for each wavelength, and S represents the scattering coefficient for each wavelength.)
[0021]
When creating basic data, each ink is weighed in a specified amount, the spectral reflectance of the ink mixture is measured, and the Fn value representing the K / S value per unit weight of each ink is calculated in advance from Equation (2). Register (formula (2 ′)). When a plurality of inks are mixed, the (K / S) mix value for each wavelength of the measurement object in the mixed ink is calculated by the equation (3). Equation (3) gives a (K / S) mix value if an arbitrary ink composition is given, and the spectral reflectance is obtained by equation (2). Further, tristimulus values X, Y, and Z are obtained from the spectral reflectance (for example, refer to JIS Z8701 “Tristimulus values of object color due to reflection”), and are variation amounts of X, Y, and Z per unit weight of ink. The partial differential coefficient used in Expression (4) is obtained.
Fn = ((K / S) n - (K / S) 0) / C n (2 ')
(Where n is the name of the ink, (K / S) n is the K / S value obtained by substituting the spectral reflectance of the measured object into the above equation (2), and (K / S) 0 is the printed object. (In this case, the K / S value of the substrate (paper) is shown.)
(K / S) mix = F 1 C 1 +... + F n C n + (K / S) 0 (3)
[0022]
That is, for an arbitrary ink blend C n (for example, C 1 is yellow ink, C 2 is red ink, and C 3 is blue ink), the ink correction amount to approximate the standard ink composition is obtained from the equation (4). It is done. Here, the difference between the tristimulus values of the mixture B and the mixture A or the mixture D and the mixture C is represented by ΔX, ΔY, ΔZ, and the variation amount of the tristimulus value per unit of ink is represented by ∂X / ∂C n , ∂Y / ∂. If C n , ∂Z / ∂C n , and the ink correction amount is ΔC n , the ink correction amount ΔC n is obtained from the matrix of the following equation (4).
[0023]
Figure 0003604075
[0024]
The present invention is mixed with the standard ink composition, and a production lot ink composition with higher white pigment of scattering power, measured reflected light each, modified from the difference between the color value calculated by the color mixing theory of CCM A value is obtained, and based on this corrected value, the blending ratio of the ink of the production lot ink composition and the amount of the diluted liquid are changed. Conventionally, when measuring the spectral reflectance of printed matter printed on a small printer, it is difficult to accurately reproduce the ink transfer amount of the small printer, and this ink transfer amount mainly affects the lightness of the color. Therefore, it was difficult to match the lightness of the obtained ink correction amount. However, in the present invention, the standard composition of the production lot ink composition is simply and highly accurate using CCM without using a small printing press. Can be corrected.
[0025]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated more concretely, this is only an illustration and does not restrict | limit this invention.
Example 1
The following ink, small printing machine, and CCM device were prepared.
(ink)
-Yellow ink: 49 yellow ("Hydric WP49 yellow" manufactured by Dainichi Seika Kogyo Co., Ltd.)
・ Red ink: 16 red ("Hydric WP16 red" manufactured by Dainichi Seika Kogyo Co., Ltd.)
・ Blue ink: 63 blue ("Hydric WP63 blue" manufactured by Dainichi Seika Kogyo Co., Ltd.)
-White ink: White ink 04 white ("Hydric WP04 white" manufactured by Dainichi Seika Kogyo Co., Ltd.)
・ Diluent part: VS-EXT (“Hydric VS Extender” manufactured by Dainichi Seika Kogyo Co., Ltd.) 80% by weight and water 20% by weight (compact printing machine)
・ K printing proofer printing machine (Matsuo Sangyo Co., Ltd.)
(CCM device)
・ Caracom ・ CCM system 2002 spectrophotometer type (manufactured by Dainichi Seika Kogyo Co., Ltd.)
[0026]
(CCM basic data creation)
Next, in order to store the spectral reflectances of the yellow ink, red ink, and blue ink used in the blending on the computer memory, a total of 18 samples for preparing CCM basic data having the blending composition shown in Table 1 were prepared. . In Table 1, the compounding numerical value indicates wt%. This sample was put in a transparent cell, each spectral reflectance was measured, and pre-registered as a K / S function of each ink, that is, a K / S value per unit weight. The spectral curve of the yellow ink sample is shown in FIG. 1, the spectral curve of the red ink sample is shown in FIG. 2, and the spectral curve of the blue ink sample is shown in FIG. In the figure, the vertical axis represents the spectral reflectance (%).
[0027]
[Table 1]
Figure 0003604075
[0028]
(Preparation of mixture (measuring ink))
Next, Table 2 to Table 2 show a mixture of the ink components of the standard ink and the white ink (hereinafter referred to as “correct formulation”) and a mixture of an intentionally different ink formulation (here referred to as “reference formulation”). It was prepared with a mixing amount (g) shown in FIG. Samples 1 to 4 are samples with high brightness assuming wallpaper, and Samples 5 to 7 are samples with low brightness assuming building material use. The amount of white ink was 150 g for samples 1 to 4 and 630 g for samples 5 to 7 so that the spectral reflectance was in the range of 20% to 60% in the wavelength range of 420 to 680 nm. The mixture of the correct blend and the mixture of the reference blend were placed in separate transparent cells for each sample, and the spectral reflectance of the reflected light was measured. FIG. 4 shows the spectral curves of the reflected light of the correct combination mixtures of Samples 1 to 7, and Table 5 shows the color values and color differences of the correct combination and reference mixture of Samples 1 to 7. The measurement method of the color value was based on the measurement method of JIS Z 8722 object color. The numerical value is D65 illuminant, 10 degree visual field L * a * b * . In addition, although the spectrum curve of the reflected light of the reference | standard mixing | blending mixture of samples 1-7 is abbreviate | omitted in a figure, as long as it sees with a spectrum curve, it is almost the same as FIG.
[0029]
[Table 2]
Figure 0003604075
[0030]
[Table 3]
Figure 0003604075
[0031]
[Table 4]
Figure 0003604075
[0032]
[Table 5]
Figure 0003604075
[0033]
Next, the tristimulus difference ΔX, ΔY, ΔZ is determined from the spectral reflectance of the reflected light of the obtained mixture of the correct composition and the mixture of the reference composition, and the correction amount of each ink is determined from the equation (4). The ink blending ratio and dilution liquid amount of the standard blending of the sample were corrected. The results are shown in Tables 11-14.
[0034]
Comparative Example 1
Printed on white paper with a standard ink composition (here “correct composition”) and intentionally printed on white paper with an ink composition with an ink composition different from the correct composition (here referred to as “reference composition”) The reflected light of the printed product was measured, and the ink composition ratio of the reference composition was corrected using CCM theory. In addition, CCM basic data for printing was created in advance.
[0035]
(Create CCM basic data for printing)
First, a total of 18 ink compositions for preparing CCM basic data having the composition shown in Table 6 were prepared. In Table 6, the blending numerical value indicates wt%. This ink composition was printed on white paper by a small printing machine, the spectral reflectance of each printed material was measured, and the K / S function of each printed material, that is, the K / S value per unit weight was pre-registered. FIG. 5 shows the spectral curve of the yellow ink sample, FIG. 6 shows the spectral curve of the red ink sample, and FIG. 7 shows the spectral curve of the blue ink sample. In the figure, the vertical axis represents the spectral reflectance (%).
[0036]
[Table 6]
Figure 0003604075
[0037]
(Preparation of ink composition for printing and creation of printed matter)
Each printed ink composition having the correct composition and the reference composition shown in Tables 7 to 9 was printed on white paper using a small test printer. In the table, samples 8 to 11 are samples having high brightness assuming wallpaper, and samples 12 to 14 are samples having low brightness assuming building material use. The test measured the reflected light of the printed material. FIG. 8 shows the spectral curves of the reflected light of the prints with the correct compositions of Samples 8-14. Table 10 shows the color values and color differences of the printed materials according to the correct composition and the reference composition of each sample. The measurement method of the color value was based on the measurement method of JIS Z 8722 object color. The numerical value is D65 illuminant, 10 degree visual field L * a * b * . In addition, although the spectral curve of the reflected light of the printed material of the reference | standard composition of samples 8-14 is abbreviate | omitted in a figure, as long as it sees with a spectral curve, it is the same as that of FIG.
[0038]
Next, tristimulus differences ΔX, ΔY, ΔZ are obtained from the spectral reflectance of the reflected light of the correct composition and the reference composition, and the correction amount of each ink is obtained from the equation (4). The blending ratio and diluent were corrected. The results are shown in Tables 11-14.
[0039]
[Table 7]
Figure 0003604075
[0040]
[Table 8]
Figure 0003604075
[0041]
[Table 9]
Figure 0003604075
[0042]
[Table 10]
Figure 0003604075
[0043]
[Table 11]
Figure 0003604075
[0044]
[Table 12]
Figure 0003604075
[0045]
[Table 13]
Figure 0003604075
[0046]
[Table 14]
Figure 0003604075
[0047]
In Tables 11 to 14, the numerical value in the “additional correct combination” column is a value obtained by subtracting “reference combination (composition)” from “correct combination (composition)” in each sample. The numerical value in parentheses in the “white ink” column is the white ink correction amount (g) calculated by CCM, and the numerical value in parentheses in the “VS-EXT” column is the above white ink in the above equation (1). Is the correction amount (g) of the diluent part (VS-EXT) obtained by substituting the correction amount (g).
[0048]
(Comparison of color values of printed materials of corrected ink compositions)
The printed matter was printed on white paper using the ink composition modified and blended in Example 1 and Comparative Example 1, and the color values of the two printed matters were compared. For printing, use a small printing machine and place the correct blend composition and the modified blend composition on the plate so that the amount of ink transfer under the printing conditions is the same. The color values were measured after printing. The results are shown in Table 15. The measuring method was based on the measuring method of JIS Z 8722 object color. The numerical value is D65 illuminant, 10 degree visual field L * a * b * . In Table 15, “Standard” is the color value of the printed material with the standard ink composition.
[0049]
[Table 15]
Figure 0003604075
[0050]
As is clear from Table 15, in Examples 1 to 4 (Examples) and Samples 8 to 11 (Comparative Examples) with high brightness assuming wallpaper, the results of Examples were more accurate. In addition, in Examples 5 to 7 (Examples) and Samples 12 to 14 (Comparative Examples) having low brightness assuming a building material application, the results of Examples were more accurate.
[0051]
【The invention's effect】
According to the present invention, in industrial production of printed matter such as wallpaper and building material film, CCM is used without using a small test printing machine in order to keep the color matching degree of the production lot printed matter with respect to the sample printed matter within the limit. Thus, the standard composition of the production lot ink composition can be easily and accurately corrected.
[Brief description of the drawings]
FIG. 1 shows a spectral curve of reflected light of 49 yellow ink containing white ink for CCM basic data.
FIG. 2 shows a spectral curve of reflected light of 16 red ink containing white ink for CCM basic data.
FIG. 3 shows a spectral curve of reflected light of 63 blue ink containing white ink for CCM basic data.
FIG. 4 shows a spectral curve of reflected light of correct formulations of Samples 1-7.
FIG. 5 shows a spectral curve of reflected light of a printed material of 49 yellow ink composition for CCM basic data.
FIG. 6 shows a spectral curve of reflected light of a printed material of 16 red ink composition for CCM basic data.
FIG. 7 shows a spectral curve of reflected light of a printed product of 63 blue ink composition for CCM basic data.
FIG. 8 shows a spectral curve of reflected light of a printed material of correct answers of samples 1 to 7;

Claims (4)

白顔料を除く複数のインキと希釈液部からなる生産ロットインキ組成物の前記複数のインキのインキ配合比率を既に調色されてインキ配合比率が既知である標準インキ組成物との比較において、白顔料物を希釈剤としたCCMデータベースを用いたCCMにより修正する方法であって、前記生産ロットインキ組成物のインキと白顔料物の混合物Aと、前記標準インキ組成物のインキと白顔料物の混合物Bとを調製し、前記混合物Aの反射光から算出される表色値Aと前記混合物Bの反射光から算出される表色値Bを求め、表色値Aと表色値Bの差と、予め各インキと白顔料物の混合物の分光反射率から計算されたCCMデータベース内の基礎データとを比較し、該CCMから算出された白顔料物を含む修正配合から白顔料物を希釈液部に置き換えることにより、前記生産ロットインキ組成物の複数インキのインキ配合比率を修正することを特徴とするインキの配合比率の修正方法。In comparison to a standard ink composition of the plurality of the ink formulation ratio is already toned ink mixing ratio of ink production lot ink composition comprising a plurality of ink and the diluent portion is known except for white pigments, white A method of correcting by CCM using a CCM database using a pigment as a diluent , comprising: a mixture A of the ink of the production lot ink composition and a white pigment material A; and an ink and a white pigment material of the standard ink composition A mixture B is prepared, a colorimetric value A calculated from the reflected light of the mixture A and a colorimetric value B calculated from the reflected light of the mixture B are obtained, and the difference between the colorimetric value A and the colorimetric value B And the basic data in the CCM database calculated in advance from the spectral reflectance of the mixture of each ink and white pigment material, and dilute the white pigment material from the modified formulation containing the white pigment material calculated from the CCM. Put in the department By obtaining, modifying the method of blending ratio of the ink, characterized by modifying the ink formulation ratio of multiple inks of the production lot ink composition. 白顔料を除く複数のインキと希釈液部からなる生産ロットインキ組成物の前記複数のインキのインキ配合比率を既に調色されてインキ配合比率が既知である標準インキ組成物との比較においてCCMにより修正する方法であって、前記生産ロットインキ組成物と白顔料物の混合物Cと、前記標準インキ組成物と白顔料物の混合物Dとを調製し、前記混合物Cの反射光から算出される表色値Cと前記混合物Dの反射光から算出される表色値Dを求め、表色値Cと表色値Dの差と、予め各インキ、希釈液部及び白顔料物の混合物の分光反射率から計算されたCCMデータベース内の基礎データとを比較することにより、前記生産ロットインキ組成物の複数インキのインキ配合比率を修正することを特徴とするインキの配合比率の修正方法。 In comparison with a standard ink composition in which the ink blending ratio of the plurality of inks in the production lot ink composition consisting of a plurality of inks excluding white pigment and a dilute part is already toned and the ink blending ratio is known , CCM A correction method comprising preparing the production lot ink composition and white pigment mixture C and the standard ink composition and white pigment mixture D and calculating the reflected light of the mixture C. The color value D calculated from the color value C and the reflected light of the mixture D is obtained, the difference between the color value C and the color value D, and the spectral reflection of the mixture of each ink, diluent part and white pigment material in advance. A method of correcting an ink mixture ratio, wherein the ink mixture ratio of a plurality of inks in the production lot ink composition is corrected by comparing with basic data in a CCM database calculated from a rate. 前記白顔料物は、白顔料単独又は白顔料を含有する白インキであることを特徴とする請求項1又は請求項2記載のインキの配合比率の修正方法。3. The method for correcting a mixing ratio of ink according to claim 1, wherein the white pigment product is a white pigment alone or a white ink containing a white pigment. 前記表色値A及び前記表色値B、又は前記表色値C及び前記表色値Dは、その反射光の分光反射率から計算される表色値又は色彩計や色差計から測定される表色値であることを特徴とする請求項1又は2記載のインキの配合比率の修正方法。The color specification value A and the color specification value B, or the color specification value C and the color specification value D are measured from a color specification value calculated from the spectral reflectance of the reflected light, a colorimeter or a color difference meter. 3. The method for correcting the blending ratio of ink according to claim 1 or 2, wherein the color mixing value is a color value.
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