JP2018034414A - Edge burr prevention method of flexographic printing - Google Patents
Edge burr prevention method of flexographic printing Download PDFInfo
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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 “fogging at the end”, which is an important issue for improving the printing quality of flexographic printing. Edge blurring is a phenomenon in which linear blurring occurs due to poor transfer of ink at a solid portion at a rear end portion orthogonal to the printing direction (slightly solid side from the boundary with the non-image portion).
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。
Until now, solvent-type flexographic ink and solvent-type gravure ink have been mainly used for package printing. However, environmental changes on a global scale such as the expansion of the ozone hole and global warming have become remarkable, and the momentum for environmental protection has been increasing. The expansion of health damage due to air pollution and the removal of petroleum from the viewpoint of sustainability As a result, the regulations on the use of organic solvents may become more stringent. On the other hand, the consumption of film packages has been increasing globally due to population growth and rising income levels, and the production of packaging inks has been increasing year by year accordingly. In recent years, development and improvement of water-based inks, in particular water-based flexo inks, in which the organic solvent in the ink is replaced with water have been actively performed due to such changes in environmental awareness.
Furthermore, the material of the flexographic plate, the plate making technology, and the technology related to the printing machine have been greatly improved, and high-definition and high-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 ink spreads into the packaging field and is used for high-definition and high-density printing, troubles that have not been a problem so far have become obvious, one of which is called "edge blurring" It is a phenomenon.
`` Edge fading '' is a phenomenon that is seen on the solid part side slightly beyond the boundary with the non-image part at the rear end part perpendicular to the printing direction in the solid part, and is a linear blur due to ink transfer failure Therefore, it is an important issue to improve the blurring of the edge 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。
For example, in the field of offset printing, inventions relating to a ghost erasing method and a discarded net generation device for avoiding a defect phenomenon called ghost that occurs due to a density difference or arrangement of pictures are disclosed (for example,
However, these cannot be a means for solving 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 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 the solid portion of the rear end perpendicular to the printing direction of the flexographic printing so that the end portion of the flexographic solid portion does not blur. It came to provide the method of preventing an edge blur.
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, according to the present invention, a halftone dot portion for flexographic printing is provided, which is provided with a halftone dot portion adjacent to the rear end portion of the solid portion orthogonal to the printing direction so as not to cause the end portion blurring of the solid portion for flexographic printing. It relates to a prevention method.
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。 The present invention also provides flexographic printing in which the width of the halftone dot portion adjacent to the rear end of the solid portion perpendicular to the printing direction is 0.05 to 5 mm and the halftone dot percentage is 99.5 to 90%. The present invention relates to a method for preventing blurring of the end of the slab.
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 blurring at the end 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。 According to the present invention, the edge portion of the solid portion of the flexographic printing is not blurred, and a high-quality flexographic print having uniform ink transfer at the solid portion can be produced.
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 flexographic printing edge blurring prevention method of the present invention, the flexographic printing solid portion is adjacent to the solid portion at the rear end portion orthogonal to the printing direction so that the edge blurring does not occur in the flexographic printing solid portion. Is provided.
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 using a solid portion, it is possible to suppress blurring of the end portion 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 an edge blur seen on a solid portion of a flexographic print. In the present invention, a belt-like halftone dot portion is inserted at the rear end portion that is adjacent to the solid portion of the flexographic plate and orthogonal to the printing direction.
FIG. 3 is a plan view of a solid flexo plate that can prevent blurring of the end of the present invention. If the method for preventing blurring at the end of flexographic printing according to the present invention is used, 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 portion is not particularly limited from a large size of several tens of centimeters wide assuming a pattern of printed matter to a small size of several millimeters wide, and can be used for solid patches used for print density management. Also, the pattern is not limited to a quadrilateral, and can be applied to any pattern in which edge blurring 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 the flexographic printing plate cylinder and the printing plate solid portion showing the mechanism of edge blurring.
In flexographic printing, it is common to mount a plate-shaped flexographic plate on a cylindrical cylinder after plate making. Because of the difference in circumference between the top and bottom of the flexographic plate when it is mounted on a cylindrical cylinder, In contrast to the broken line shape showing the outer shape of the flexographic plate No. 4, there is a tendency for distortion to occur at the top as compared with the bottom 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, when printing is performed at the rear end portion, uneven printing pressure due to the deformation and a portion where the printing pressure is slightly insufficient occur, leading to blurring of the end portion. Since the halftone dot portion is formed by a combination of the image line portion and the non-image line portion, the distortion is eliminated in the entire dot portion, and the printing pressure is uniformly applied to the rear end portion, so that the end portion is hardly blurred. It is possible to prevent the end portion from fading by intentionally arranging the halftone dot portion at the end portion of the printing direction solid portion where the end portion fading 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。
In general, the edge blur occurs at a location about 0.2 mm to 0.5 mm away from the rear end of printing, so that the width of the halftone dot portion is preferably 0.05 to 5 mm, more preferably 0.1 mm to 2 mm. In consideration of suppressing a visual density difference from the solid portion, a halftone dot of 99.5 to 90% 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 is reproduced on the printed matter.
The number of halftone lines for determining one halftone dot size is preferably 45 line / inch to 65 line / inch. Also, a digital halftone dot of 85 to 300 dpi can be used.
〔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。
[Preparation of printing plate]
AFP-DSF (1.14 mm) manufactured by Asahi Kasei is used as the flexographic plate, and the halftone dot% adjacent to the end portion of the solid portion in the printing direction is 99.5%, 98%, 95%, 90% of the number of lines 45 lines / inch. For the four types, plates having a halftone dot processing width of 0.05 to 3.0 mm were 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 fading of edges]
Biaxially-stretched polypropylene film manufactured by Futamura Chemical Co., Ltd., using the above-mentioned printing plate, using CI type 6-color flexo printing machine SOLOFLEX made by Windmirror Co., Ltd., using DIC water-based flexo ink Marine Flex LM ink at a printing speed of 150 m / min. When solid printing is performed on FOR-AQ for 500 meters and the printing density is stabilized, the presence or absence of halftone dots and the presence or absence of “edge blurring” with respect to the halftone dot width size 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: blurring at the edges]
As an evaluation of the edge blurring prevention method of the present invention, the occurrence of “edge blurring” was visually evaluated according to the following three evaluation criteria.
○: No fading is observed at the edges.
Δ: Slight end blurring can be confirmed.
X: Fading of the edge is observed.
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 evaluation results of the occurrence of “edge blurring” when the presence / absence of halftone dots, the percentage of halftone dots, and the width size of halftone dots are changed. In Comparative Example 1, printing evaluation was performed without providing halftone dots at the solid rear end.
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 end fading prevention method of the present invention shown in the examples, the end fading can be completely suppressed or almost prevented, while the occurrence of end fading is confirmed in Comparative Example 1 in which no halftone dot is provided at the solid rear end. 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 blurring at the end of flexographic printing according to the present invention can be effectively used not only for printing plates for water-based flexographic printing but also for printing plates for oil-based flexographic printing, and is further useful for 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
DESCRIPTION OF
8 Scratches at the top of the plate
Claims (3)
The method for preventing blurring at the end of flexographic printing according to claim 1, wherein the halftone dot portion has a width in the printing direction of 0.05 to 5 mm and a halftone dot percentage of 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 |
| WO2010090315A1 (en) * | 2009-02-09 | 2010-08-12 | 東洋製罐株式会社 | Seamless can body and method of 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 |
| WO2015056703A1 (en) * | 2013-10-17 | 2015-04-23 | 富士フイルム株式会社 | Flexo 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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- 2016-08-31 JP JP2016169371A patent/JP6915245B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2010090315A1 (en) * | 2009-02-09 | 2010-08-12 | 東洋製罐株式会社 | Seamless can body and method of 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 |
| WO2015056703A1 (en) * | 2013-10-17 | 2015-04-23 | 富士フイルム株式会社 | Flexo 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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