JP6915245B2 - How to prevent edge blurring of flexographic printing - Google Patents
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Description
本発明は、フレキソ印刷の印刷品質改善の為の重要な課題である「端部かすれ」の防止方法に関する。端部かすれとは、ベタ部において印刷方向に直交する後端部（非画線部との境界よりややベタ部側）に、インキの転移不良による線状のかすれが発生するものである。 The present invention relates to a method for preventing "edge blurring", which is an important issue for improving the print quality of flexographic printing. The edge blur is a linear blur that occurs at the rear end portion (slightly solid portion side from the boundary with the non-image portion) that is orthogonal to the printing direction in the solid portion due to poor ink transfer.
パッケージ印刷には、これまで溶剤型フレキソインキや溶剤型グラビアインキが主に使用されてきた。しかし、オゾンホールの拡大、地球温暖化など全地球規模での環境変化が顕著となり、環境保護への機運がますます高まっており、大気汚染による健康被害の拡大、サステナビリティの観点からの脱石油資源への動きが加わり、有機溶剤の使用に対する規制がさらに厳しくなる可能性がある。一方で、人口増加や所得水準の上昇により世界的にフィルムパッケージの消費量は増加傾向にあり、それに伴いパッケージ用インキの生産量は年々増加している。このような環境への意識の変化から、近年、インキ中の有機溶剤を水に置き換えた水性型インキ、とりわけ水性フレキソインキの開発・改良が盛んに行われている。
更に、フレキソ版の材質、製版技術、印刷機械に関する技術が飛躍的に進歩し、グラビア印刷やオフセット印刷に匹敵する高精細でより高濃度の印刷が可能となってきた。
Solvent-type flexographic inks and solvent-type gravure inks have been mainly used for package printing. However, global environmental changes such as the expansion of the ozone hole and global warming have become prominent, and the momentum for environmental protection is increasing. With the addition of the move to, regulations on the use of organic solvents may become even more stringent. On the other hand, the consumption of film packages is increasing worldwide due to the increase in population and income level, and the production of ink for packaging is increasing year by year. Due to such changes in environmental awareness, in recent years, water-based inks in which the organic solvent in the ink has been replaced with water, especially water-based flexographic inks, have been actively developed and improved.
Furthermore, the material of flexographic plates, plate making technology, and technology related to printing machines have made dramatic progress, and high-definition and higher-density printing comparable to gravure printing and offset printing has become possible.
よって、水性フレキソインキがパッケージ分野へ普及し高精細・高濃度の印刷に使用されるに従い、これまであまり問題とならなかったトラブルも顕在化してきており、その一つが「端部かすれ」と呼ばれる現象である。
「端部かすれ」とは、ベタ部において印刷方向に直交する後端部に、非画線部との境界よりややベタ部側に見られる現象であり、インキの転移不良による線状のかすれとなって発生するため、フレキソ印刷の品質向上において、端部かすれの改善は重要な課題である。
Therefore, as water-based flexographic inks have become widespread in the packaging field and used for high-definition, high-density printing, problems that have not been a problem until now have become apparent, and one of them is called "edge blurring". It is a phenomenon.
"End blur" is a phenomenon that is seen at the rear end of a solid portion that is orthogonal to the printing direction, slightly closer to the solid portion than the boundary with the non-image area, and is a linear blur due to poor ink transfer. Therefore, improvement of edge blurring is an important issue in improving the quality of flexographic printing.
オフセット印刷分野の例を挙げれば、絵柄の濃度差や配置によって発生するゴーストと呼ばれる不良現象を回避するためのゴースト消去方法および捨て網生成装置に関する発明
が開示されている（例えば、特許文献１及び２）。
しかし、これらは、フレキソ印刷の「端部かすれ」を解決する手段に成りえない。
To give an example in the field of offset printing, inventions relating to a ghost erasing method and a discard net generator for avoiding a defective phenomenon called ghost caused by a difference in density or arrangement of patterns are disclosed (for example,
However, these cannot be a means to solve the "edge blur" of flexographic printing.
本発明の課題は、フレキソ印刷の「端部かすれ」の現象発生を防止する方法を提供するものである。 An object of the present invention is to provide a method for preventing the occurrence of the phenomenon of "edge blurring" in flexographic printing.
発明者らは鋭意研究を重ねた結果、フレキソ印刷のベタ部について端部かすれが起きないように、その刷版について印刷方向に直交する後端部のベタ部に工夫を加える事でフレキソ印刷の端部かすれを防止する方法を提供するに至った。 As a result of intensive research, the inventors have devised a solid part at the rear end of the printing plate that is orthogonal to the printing direction so that the solid part of the flexographic printing does not have a faint edge. We have come to provide a method to prevent edge blurring.
即ち、本発明はフレキソ印刷のベタ部について端部かすれが起きないように、印刷方向に直交するベタ部の後端部に隣接する網点部を設けることを特徴とするフレキソ印刷の端部かすれ防止方法に関する。 That is, the present invention is characterized in that a halftone dot portion adjacent to the rear end portion of the solid portion orthogonal to the printing direction is provided so that the end portion of the solid portion of flexographic printing is not blurred. Regarding prevention methods.
また、本発明は印刷方向に直交するベタ部の後端部に隣接する網点部の印刷方向の幅が０．０５〜５ｍｍであり、網点％が９９．５〜９０％であるフレキソ印刷の端部かすれ防止方法に関する。 Further, in the present invention, the width of the halftone dot portion adjacent to the rear end portion of the solid portion orthogonal to the printing direction in the printing direction is 0.05 to 5 mm, and the halftone dot% is 99.5 to 90% flexographic printing. Regarding the method of preventing the edge of the surface from being scratched.
更に、本発明は該フレキソ印刷の端部かすれ防止方法を用いた印刷物に関する。 Furthermore, the present invention relates to a printed matter using the method for preventing edge blurring of flexographic printing.
本発明により、フレキソ印刷のベタ部について端部かすれが生じる事がなく、ベタ部でのインキ転移性が均一の高品質なフレキソ印刷物を作製する事が出来る。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to produce a high-quality flexographic printed matter having uniform ink transfer property in the solid portion without causing blurring at the end of the solid portion of flexographic printing.
本発明のフレキソ印刷の端部かすれ防止方法は、フレキソ印刷のベタ部について端部かすれが起きないように、そのフレキソ版について印刷方向に直交する後端部に、ベタ部に隣接する網点部を設けることを特徴とするものである。 In the method for preventing edge blurring of flexographic printing of the present invention, a halftone dot portion adjacent to a solid portion is provided at the rear end portion of the flexographic plate orthogonal to the printing direction so that edge blurring does not occur in the solid portion of flexographic printing. It is characterized by providing.
ベタ部を使用する場合、印刷方向に直交する後端部に帯状の網点部を挿入することで端部かすれの発生を抑える事ができる。図１は、フレキソ印刷物のベタ部に見られる端部かすれの拡大写真である。本発明はフレキソ版のベタ部に隣接して印刷方向に直交する後端部に帯状の網点部を挿入する。
図３は、本発明の端部かすれの防止となりうるベタ部のフレキソ板の平面図である。本願発明によるフレキソ印刷の端部かすれ防止方法を用いれば、図２に示す白抜けのない良質なベタ部からなる印刷物を得る事ができる。
ベタ部分のサイズは印刷物の絵柄を想定した数十センチ幅の大サイズから、数ミリ幅の小サイズまで特に限定はなく、印刷濃度管理に使用するベタパッチに対しても使用する事ができる。また、絵柄は四辺形に限定するものではなく、端部かすれが発生するあらゆる絵柄に適用できる。
When a solid portion is used, it is possible to suppress the occurrence of edge blurring by inserting a band-shaped halftone dot portion at the rear end portion orthogonal to the printing direction. FIG. 1 is an enlarged photograph of edge faintness seen in a solid portion of a flexographic printed matter. In the present invention, a band-shaped halftone dot portion is inserted at the rear end portion adjacent to the solid portion of the flexographic plate and orthogonal to the printing direction.
FIG. 3 is a plan view of a flexographic plate having a solid portion that can prevent the end portion of the present invention from being blurred. By using the method for preventing edge blurring of flexographic printing according to the present invention, it is possible to obtain a printed matter composed of a high-quality solid portion without white spots shown in FIG.
The size of the solid part is not particularly limited from a large size of several tens of centimeters wide assuming a printed matter pattern to a small size of several millimeters wide, and can also be used for a solid patch used for print density control. In addition, the pattern is not limited to a quadrilateral, and can be applied to any pattern in which edge fading occurs.
図４は、端部かすれのメカニズムを示すフレキソ刷版シリンダーと刷版ベタ部の断面図を示すイラスト図である。
フレキソ印刷では、製版後に平板状のフレキソ版を円筒形のシリンダーにマウントする方法が一般的であり、円筒形のシリンダーに装着する際にフレキソ版の上部と下部との円周の違いから、図４のフレキソ版の外形を示す破線形状に対し、実線の様に版の底部に比較して上部にひずみが発生する傾向にある。
このひずみを解消するため、ベタ部の両端部（非画線部との境界よりややベタ部側）でわずかに変形が生じる。特に後端部では印刷の際、前記変形による印圧の不均一、僅かな印圧不足の箇所が発生することで端部かすれにつながる。網点部は画線部と非画線部との組み合わせにより形成されるため、網点部全体でひずみを解消し、後端部においても印圧は均一に働き端部かすれは発生しにくい。端部かすれが発生しやすい印刷方向ベタ部末端部に意図的に網点部を配することで端部かすれを防ぐことができるのである。
FIG. 4 is an illustration showing a cross-sectional view of a flexographic printing plate cylinder and a solid printing plate portion showing the mechanism of edge blurring.
In flexographic printing, a method of mounting a flat plate-shaped flexo plate on a cylindrical cylinder after plate making is common, and when mounting on a cylindrical cylinder, the difference in circumference between the upper and lower parts of the flexo plate is shown in the figure. With respect to the broken line shape showing the outer shape of the flexographic plate of No. 4, distortion tends to occur at the upper part as compared with the bottom part of the plate as shown by the solid line.
In order to eliminate this distortion, slight deformation occurs at both ends of the solid portion (slightly solid portion side from the boundary with the non-image portion). In particular, at the rear end portion, when printing, uneven printing pressure due to the deformation and a slight shortage of printing pressure occur, which leads to fading of the end portion. Since the halftone dot portion is formed by the combination of the halftone dot portion and the non-image pattern portion, the distortion is eliminated in the entire halftone dot portion, the printing pressure is uniformly applied even at the rear end portion, and the end portion is less likely to be blurred. It is possible to prevent edge blurring by intentionally arranging halftone dots at the end of the solid portion in the printing direction where edge blurring is likely to occur.
一般的に端部かすれは印刷後端部から０．２ｍｍ〜０．５ｍｍ程度離れた箇所に発生することから、網点部の幅は０．０５〜５ｍｍが好ましく、より好ましくは０．１ｍｍ〜２ｍｍである。またベタ部との視覚的な濃度差を抑えること考慮すれば９９．５〜９０％の網点が好ましく、より好ましくは９９〜９５％である。網点サイズが９０％より小さいと網点の絵柄として印刷物に再現されてしまう恐れが生じる。
１つの網点サイズを決める網点線数としては４５ｌｉｎｅ／ｉｎｃｈ〜６５ｌｉｎｅ／ｉｎｃｈが好ましい。また、８５〜３００ｄｐｉのデジタル網点を使用する事もできる。
Generally, edge blurring occurs at a position separated from the rear edge of printing by about 0.2 mm to 0.5 mm. Therefore, the width of the halftone dot portion is preferably 0.05 to 5 mm, more preferably 0.1 mm to 0.1 mm. It is 2 mm. Further, considering that the visual density difference from the solid portion is suppressed, 99.5 to 90% of halftone dots is preferable, and 99 to 95% is more preferable. If the halftone dot size is smaller than 90%, there is a risk that the halftone dot pattern will be reproduced in the printed matter.
The number of halftone dots that determines the size of one halftone dot is preferably 45 lines / inch to 65 lines / inch. It is also possible to use 85 to 300 dpi digital halftone dots.
〔刷版の作製〕
フレキソ版として旭化成製ＡＦＰ−ＤＳＦ（１．１４ｍｍ）を使用し、印刷方向ベタ部末端部に隣接する網点％を線数４５ｌｉｎｅ／ｉｎｃｈの９９．５％、９８％、９５％、９０％の４種に対し、網点の処理幅が０．０５〜３．０ｍｍのものを表１に従って製版した。
[Making a printing plate]
Asahi Kasei AFP-DSF (1.14 mm) is used as the flexographic plate, and the percentage of halftone dots adjacent to the end of the solid portion in the printing direction is 99.5%, 98%, 95%, 90% of the number of lines of 45 lines / inch. For each of the four types, those having a halftone dot processing width of 0.05 to 3.0 mm were plate-made according to Table 1.
〔印刷物の作製／端部かすれの評価〕
前記刷版を用いウィンドミラー社製ＣＩ型６色フレキソ印刷機ＳＯＬＯＦＬＥＸ、印刷速度１５０ｍ／ｍｉｎにて、ＤＩＣ社製水性フレキソインキ マリーンフレックス ＬＭ 墨を使用し、フタムラ化学株式会社製二軸延伸ポリプロピレンフィルムＦＯＲ−ＡＱにベタ印刷を５００メートル行い印刷濃度が安定した所で、網点部分の有無、網点の幅サイズに対する「端部かすれ」の有無を目視にて確認する。
[Preparation of printed matter / Evaluation of edge fading]
Using the above printing plate, Windmirror CI type 6-color flexo printing machine SOLOFLEX, printing speed 150 m / min, using DIC water-based flexo ink Marineflex LM ink, biaxially stretched polypropylene film manufactured by Futamura Chemical Co., Ltd. Solid printing is performed on FOR-AQ for 500 meters, and when the print density is stable, the presence or absence of halftone dots and the presence or absence of "edge blurring" with respect to the width size of the halftone dots are visually confirmed.
〔印刷物の評価方法：端部かすれ〕
本発明の端部かすれ防止方法の評価として、「端部かすれ」の発生具合を下記３段階の評価基準にて目視評価した。
○：端部かすれが全く見られない。
△：端部かすれが僅かに確認できる。
×：端部かすれが見られる。
[Evaluation method for printed matter: faint edges]
As an evaluation of the edge blur prevention method of the present invention, the degree of occurrence of "edge blur" was visually evaluated according to the following three-step evaluation criteria.
◯: No faint edges are seen.
Δ: Slight edge fading can be confirmed.
X: The edge is faint.
表１、２に網点部分の有無、網点パーセント、網点の幅サイズを変更した際の「端部かすれ」の生じ具合を評価結果として示す。比較例１はベタ後端部に網点を設けずに印刷評価した。 Tables 1 and 2 show the presence or absence of halftone dots, the percentage of halftone dots, and the degree of occurrence of "edge blurring" when the width size of halftone dots is changed as evaluation results. In Comparative Example 1, printing was evaluated without providing halftone dots at the rear end of the solid.
実施例が示す本発明の端部かすれ防止方法では、端部かすれが完全に抑制できる、若しくはほぼ防止できる一方、ベタ後端部に網点を設けない比較例１では端部かすれの発生が確認できた。 In the method for preventing edge blurring of the present invention shown in Examples, edge blurring can be completely suppressed or almost prevented, while in Comparative Example 1 in which halftone dots are not provided at the solid rear end portion, occurrence of edge blurring is confirmed. did it.
本発明のフレキソ印刷の端部かすれ防止方法は、水性フレキソ向け刷版のみならず油性フレキソ向け刷版にも有効活用でき、これらの高精細・高濃度印刷に於いても更に有用である。 The method for preventing edge blurring of flexographic printing of the present invention can be effectively used not only for printing plates for water-based flexo but also for printing plates for oil-based flexo, and is further useful in these high-definition and high-density printing.
１ 印刷方向
２ 端部かすれ部分
３ フレキソ版ベタ部
４ フレキソ版網点部
５ フレキソ印刷機の版胴
６ 版胴の回転方向
７ フレキソ版（破線に対し実線は版装着時の歪みを示す）
８ 版上端部かすれの発生箇所
1
8 Where the top edge of the plate is blurred
Claims (3)
前記網点部全体の網点％が９９．５〜９０％であることを特徴とするフレキソ印刷の端部かすれ防止方法。 A single halftone dot% halftone dot portion adjacent to the rear end portion of the solid portion orthogonal to the printing direction is provided so that the end portion of the solid portion of flexographic printing is not blurred.
A method for preventing edge blurring of flexographic printing, wherein the halftone dot% of the entire halftone dot portion is 99.5 to 90%.
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| US20050157347A1 (en) * | 2004-01-21 | 2005-07-21 | Hans Dewitte | Relief plates, platemaking masters therefor, and methods for producing such plate making masters and plates |
| JP4623335B2 (en) * | 2009-02-09 | 2011-02-02 | 東洋製罐株式会社 | Seamless can body and method for producing seamless can body |
| US20100224091A1 (en) * | 2009-03-06 | 2010-09-09 | Zwadlo Gregory L | Trailing edge pattern for relief plate feature |
| JP2011088353A (en) * | 2009-10-22 | 2011-05-06 | Asahi Kasei E-Materials Corp | Method of manufacturing printing plate |
| JP6059818B2 (en) * | 2013-10-17 | 2017-01-11 | 富士フイルム株式会社 | Flexographic printing plate |
| WO2017051921A1 (en) * | 2015-09-25 | 2017-03-30 | 富士フイルム株式会社 | Flexographic printing plate |
| JP2017154301A (en) * | 2016-02-29 | 2017-09-07 | 富士フイルム株式会社 | Flexographic printing plate, manufacturing method of flexographic printing platte and manufacturing device of flexographic printing plate |
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