JP3923656B2 - Print version - Google Patents
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- JP3923656B2 JP3923656B2 JP15840398A JP15840398A JP3923656B2 JP 3923656 B2 JP3923656 B2 JP 3923656B2 JP 15840398 A JP15840398 A JP 15840398A JP 15840398 A JP15840398 A JP 15840398A JP 3923656 B2 JP3923656 B2 JP 3923656B2
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【０００１】
【産業上の利用分野】
本願発明は、エッチング法又はレーザ破壊法により製作される印刷版（グラビア版、凸版、及び親インキ性を有する平滑部を有するフレキソ版やオフセット版）であって、ライト部のドットの形状を改善することによりインキの分散性が良好な印刷物が得られ、さらに、凹版にあっては、ライト部のドットの形状を改善することによりセルからの被印刷物へのインキの転移性が良好でありライト部が白く抜けて見えるインキが転移していないポイントを無くした印刷物が得られる印刷版に関する。
【０００２】
【従来の技術】
インキの分散性は、その濃淡階調度を出すための一個のドットの面積の大小と、インキの厚さと、ドットの面積一杯に均一にインクが転移していること、の相関関係によって決まる。
ドットの面積が小さくてもインキが厚く転移すると濃淡階調度が不自然になる。また、ドットの面積が大きくてもインキが均一に転移せず中央が高くなる山盛り状態であると、ドットの大きさに対するインクの分散性が悪く、濃淡階調度も悪くなる。さらに、転移インキ量及びドット面積が同一の場合、丸いドット形状は細長いドット形状に比べてインクの分散性が悪い。他方、細長いドット形状はモアレが生じる虞れがある。
図４は、電子彫刻機（ヘリオクリッショグラフ）のダイヤモンド針の彫り込みにより得られる従来のグラビア印刷版のセルの形状を示すもので、中央部が一番深い角錐孔状の菱形セルであり、セルの深度が浅くセル幅が大きいのでセル内でのインキの表面張力が小さく作用しインクの転移性が良いが、転移したインキが山盛りとなり平滑にならないからドットの大きさに対するインキの分散性が悪く、濃淡階調度も悪くなる。
図５は、エッチング法により得られる従来の一般的なグラビア印刷版のセルの形状を示すもので、丸孔形ないし角円形のセルであり、最シャドウ部のセルをスクリン線の交点付近が欠いて開孔率を大きくしたフリーフローセルとすることができる。しかし、セルの輪郭部の深度が深くセル幅が小さいのでライト部においてはセル内の孔壁面におけるインキの表面張力が大きく作用しインクの転移性が図４のセルよりも劣り、ライト部における白く抜けて見える点がやや多い。
また図示しないが、本願出願人の出願の特願平６−２８９９１号に係るグラビア印刷版は、エッチング法により得られるグラビア印刷版であり、ライト部のセルの形状がドクター接触線に直角な方向に長尺な長孔形セルであり、ドクターでセル内のインキが掻き取られることが少ないので中抜け（セル中央部でのインキの不転移）が起こりにくいものの、セル幅が小さいのでセル内でのインキの表面張力が大きく作用しインキの転移性が劣り、モアレが発生しやすいので特願平６−１２４６２８号や特願平６−１５０３９０号のようなモアレを解消することが必須となる。
さらに図示しないが、本願出願人の出願の特願平７−２１６７１４号に係るグラビア印刷版は図５のセルと同様の丸孔形ないし角円形のセルでライト部からシャドウ部の開孔率となるように分散しており、エッチング管理が良好に行われ完全な分布状態のセルができれば濃淡階調が優れているが、セルが開口されなかったりセルが繋がってしまうなどエッチング管理が難しい上、図５と同様にセル内でのインキの表面張力が大きく作用しインクの転移性が劣る。
他方、凸版や平版においても、ライト部のインクを盛り付けるドットの形状は、図５に略対応した略円形であるのでインキの分散性が劣っていた。
【０００３】
【発明が解決しようとする課題】
本願発明は、エッチング法又はレーザ破壊法により製作される印刷版であって、ライト部ないし中間調部のドットの形状を改善することにより、インキの分散性が良好な印刷物が得られ、さらに、凹版にあっては、セルからの被印刷物へのインキの転移性が良好でありライト部が白く抜けて見えるインキが転移していないポイントを無くした印刷物が得られる印刷版を提供することを目的としている。
【０００４】
【課題を解決するための手段】
本願発明は、画素のインクを盛り付けるドットが凹部、凸部、又は親インキ性を有する平滑部でありエッチング法又はレーザ破壊法により製作される印刷版であって、ライト部のドットに関する、画素を形成するためのインクを盛り付けるドットを、濃淡階調度に対応して漸次に大きくなる概略Ｖ字形状を構成するように、三角形の頂点と底辺がロール周面方向に位置する三角部と、該三角部の底辺の両端より斜辺の延長線上に延長している二本の短直線部とからなることを特徴とする印刷版を提供するものである。
また、本願発明は、最シャドウ部が六角形のドットを敷き詰めた形状であり、最シャドウ部以外のドットが、最シャドウ部のドットを敷き詰めた時の各六角形の略中心に位置するように配列されていることを特徴とする印刷版を提供するものである。
【０００５】
【発明の実施の形態】
図１は、本願発明の印刷版をグラビア印刷版において実施する第一の形態を示す。
このグラビア印刷版は、最シャドウ部（限定するものでないが、例えば８０％の開孔率）が六角形のドット（セル）を敷き詰めた形状である。そして、最シャドウ部以外の大きさのドットが、最シャドウ部のドットを敷き詰めた時の各六角形の中心に位置するように正斜列に配列している。
濃淡階調度が０％超〜１６％以下のライト部のセルは、濃淡階調度に対応して漸次に大きくなる概略Ｖ字形状を構成するように、三角形の頂点と底辺がロール周面方向に位置する三角部と、該三角部の底辺の両端より斜辺の延長線上に延長している二本の短直線部とからなる。三角部は、面積及び幅が大きいので、エッチング特性により、二本の短直線部他の部分よりも深くエッチングされる。
濃淡階調度が２５％のときのセルは概略三角形状であり、図示しない、濃淡階調度が１６％超〜２５％未満のライト部ないし中間調部のセルを設けるときは、１６％のときの概略Ｖ字形状のセルから２５％のときの概略三角形状のセルに漸次に変化する形状にする。
濃淡階調度が３５％のときのセルは概略六角形状であり、図示しない、濃淡階調度が２５％超〜３５％未満の中間調部のセルを設けるときは、２５％のときの概略三角形状のセルから３５％のときの概略六角形状のセルに漸次に変化する形状にする。
濃淡階調度が３５％超〜８０％未満の中間調ないしシャドウ部のセルは、濃淡階調度に対応するようにほぼ相似形を維持して漸次に大きくなる概略六角形状とする。
このグラビア印刷版は、二本の短直線部で深度が浅く、三角部で深度が深くエッチングされる。インキのセルからの離型性は、セルが深ければ大きくなる。これは、インキのセル側面壁への吸着力が増すことに起因するものと思われる。しかして、二本の短直線部でのインキの離型性は良好であり、二本の短直線部は、、深度が浅い部分での表面張力が小さく抑えられるからインキの転移性の良好である。この印刷版がグラビア印刷版でなく、凸版や親インキ性を有する平滑部を有するフレキソ版やオフセット版である場合には、ドットがセルで構成されないから、セルの深浅との関係は生じない。しかし、濃淡階調度が０％超〜１６％のセルが、三角形の頂点と底辺がロール周面方向に位置する三角部と、該三角部の底辺の両端より斜辺の延長線上に延長している二本の短直線部とからなる概略Ｖ字形状であるので、開孔率が同じでもドットの端から端までの距離が図４及び図５のセルに比べておおきくなるからインキの分散性が高くなる硬化がある。
実施例として、１００ミクロン前後にバラード銅メッキしてなる被製版面を鏡面研磨し、表面活性化処理してから、アルゴン・ネオンガスレーザビームー等の弱いレーザビームによって硬化し得る高感度特性を有する一液性の感光性樹脂を塗布・乾固し３ミクロンの厚さの感光性樹脂膜を形成し、次いで、感光性樹脂膜に前記レーザビームをドクター版面接触線と直交する方向に主走査するとともにレーザビームの版面における隣合う被照射線同士がオーバーラップしてずれるように副走査しかつ印刷情報に応じたレーザビームの点滅照射を行うことにより、感光性樹脂膜にネガチブな印刷情報を書き込んだ後、現像を行って感光性樹脂膜の未露光部分を溶解して後、レジストを加熱硬化してからエッチングして被版面にポジチブな印刷情報を点状に彫り込み、レジスト剥離して耐刷力を付けるためクロムメッキしたところ、ライト部の印刷がインキが転移せずに白く見えるポイントを図４に示すセルと同等に無くした印刷物が得られた。また、インキの分散性は図４に示すセルよりも向上した。
図２は、本願発明の印刷版をグラビア印刷版としたときの実施の形態であって、８０％の最シャドウ部のセルを、スクリン線の交差部又はその近傍を断続させてフリーフローセルとしたものである。
（ａ）は、一つドットを画成する六角形のスクリン線で形成された一個のドットを分散して有しかつ該スクリン線が切れていないドットの回りの六個のドットを画成するスクリン線が一部切れている。（ｂ）及び（ｃ）は、全てのドットについて、ドットを形成するスクリン線が一部切れている。（ｂ）は、ドットを形成するスクリン線が「Ｚ〕形に分断し三方向に異なって分散している。（ｃ）は、ドットを形成するスクリン線が「Ｙ〕形に分断している。
フリーフローセルにすると、ドクターでインキを掻いてセル内にインキを充満させるときに、インキの流れによりセル内に気泡を残留するのを防止できるので、インキの転移性が良好である。
【０００６】
図３は、本願発明の印刷版をグラビア印刷版において実施する第二の形態を示す。このグラビア印刷版は、最シャドウ部（限定するものでないが、例えば８０％の開孔率）が四角形のドット（セル）を敷き詰めた形状である。そして、最シャドウ部以外の大きさのドットが、最シャドウ部のドットを敷き詰めた時の各四角形の中心に位置するように正列している。濃淡階調度が０％超〜１６％以下のライト部のセルは、濃淡階調度に対応して漸次に大きくなる概略Ｖ字形状を構成するように、三角形の頂点と底辺がロール周面方向に位置する三角部と、該三角部の底辺の両端より斜辺の延長線上に延長している二本の短直線部とからなる。これは、第一の形態と同一である。濃淡階調度が２５％のときのセルは概略三角形状であり、図示しない、濃淡階調度が１６％超〜２５％未満のライト部ないし中間調部のセルを設けるときは、１６％のときの概略Ｖ字形状のセルから２５％のときの概略三角形状のセルに漸次に変化する形状にする。これは、第一の形態と同一である。濃淡階調度が３５％のときのセルは概略六角形状であり、図示しない、濃淡階調度が２５％超〜３５％未満の中間調部のセルを設けるときは、２５％のときの概略三角形状のセルから３５％のときの概略六角形状のセルに漸次に変化する形状にする。これは、第一の形態と同一である。濃淡階調度が３５％超〜８０％未満の中間調ないしシャドウ部のセルは、濃淡階調度に対応するようにほぼ相似形を維持して漸次に大きくなる概略四角形状とする。
【０００７】
本願発明の印刷版は、グラビア印刷版のみでなく、凸版、及び親インキ性を有する平滑部を有するフレキソ版やオフセット版に適用すると、インキの転移性がよく濃淡階調度を改善できる。また本願発明の印刷版は、ロール印刷版のみでなく平版も含まれる。さらにまた本願発明は、上記実施例に示す製版法、すなわち、レーザ露光・現像によるレジスト画像の形成とその後のエッチングする方法に限定されるものでなく、ロール表面を磁性粉末を含んだエポキシ樹脂等の硬質プラスチック膜で形成してヤグレーザ等の高力レーザで直接にセルを彫り込んでなるグラビア印刷版も含まれる。
【０００８】
【発明の効果】
以上説明してきたように、本願発明の印刷版は、エッチング法又はレーザ破壊法により製作されるグラビア版、凸版、及び親インキ性を有する平滑部を有するフレキソ版やオフセット版であり、ライト部のドットの形状を概略Ｖ字形に形成したので、同ライト部のインキの分散性が良好な印刷物が得られる。
さらに、本願発明の印刷版、エッチング法又はレーザ破壊法により製作される印刷版、特に凹版（グラビア印刷版）によれば、ライト部のドットの形状を改善することによりセルからの被印刷物へのインキの転移性が良好でありライト部が白く抜けて見えるインキが転移していないポイントを無くした印刷物が得られる。すなわち、本願発明にかかるグラビア印刷版によれば、図４に示す電子彫刻機のダイヤモンド針の彫り込みにより得られる従来のグラビア印刷版のライト部のセルの形状と同様に、ドット形状の中央部においてセル深度が深く、四方にセル深度が浅く延びているので、セル内で側壁面におけるインキの表面張力が小さく抑えることができてインクの転移性が良く、加えて、インキが山盛りとならないからインキの分散性が良好であり、ライト部の印刷がインキが転移せずに白く見えるポイントを図４に示すセルと同等に無くした印刷物が得られた。また、インキの分散性は図４及び図５に示すセルよりも向上した。さらに、本願発明の印刷版は、モアレが生じない。
【図面の簡単な説明】
【図１】本願発明の印刷版をグラビア印刷版とした場合における、第一の実施の形態を示す濃淡階調度に対応したドット（セル：白抜きのエリア）の形状を示す図。
【図２】本願発明の印刷版をグラビア印刷版としたときの実施の形態であって、８０％の最シャドウ部のセルを、スクリン線の交差部又はその近傍を断続させてフリーフローセルとしたドット（セル：白抜きのエリア／スクリン線：黒）の形状を示す図。
【図３】本願発明の印刷版をグラビア印刷版とした場合における、第二の実施の形態を示す濃淡階調度に対応したドット（セル：白抜きのエリア）の形状を示す図。
【図４】電子彫刻機のダイヤモンド針の彫り込みにより得られる従来のグラビア印刷版のライト部のセルの形状を示す図。
【図５】エッチング法により得られる従来の一般的なグラビア印刷版のライト部のセルの形状を示す図。[0001]
[Industrial application fields]
The present invention is a printing plate (gravure plate, relief plate, flexographic plate having a smooth portion having ink-philicity, or offset plate) manufactured by an etching method or a laser destruction method, and improves the dot shape of the light portion. As a result, printed matter with good ink dispersibility can be obtained, and for intaglio, the dot shape of the light part can be improved to improve the ink transfer from the cell to the printed material. The present invention relates to a printing plate from which a printed matter can be obtained in which the point where ink that appears to be white is missing is not transferred.
[0002]
[Prior art]
The dispersibility of the ink is determined by the correlation between the size of the area of one dot for obtaining the gradation gradation, the thickness of the ink, and the fact that the ink is uniformly transferred over the area of the dot.
Even if the dot area is small, if the ink is transferred thickly, the gradation level becomes unnatural. Also, even if the area of the dots is large, if the ink is not transferred uniformly and the center is high, the dispersibility of the ink with respect to the size of the dots is poor, and the tone gradation is also poor. Further, when the transfer ink amount and the dot area are the same, the round dot shape has a lower ink dispersibility than the elongated dot shape. On the other hand, the elongated dot shape may cause moire.
FIG. 4 shows the shape of a cell of a conventional gravure printing plate obtained by engraving diamond needles of an electronic engraving machine (Heliocrigraph), which is a rhomboid cell having a deepest pyramidal hole at the center, Since the cell depth is shallow and the cell width is large, the surface tension of the ink in the cell is small and the ink transfer property is good, but the transferred ink is piled up and does not become smooth, so the ink dispersibility with respect to the dot size It is bad, and the gradation is also poor.
FIG. 5 shows the shape of a cell of a conventional general gravure printing plate obtained by an etching method, which is a round hole shape or a square shape cell, and the cell in the most shadow portion is lacking near the intersection of the screen lines. Thus, a free flow cell with a large open area ratio can be obtained. However, since the depth of the outline of the cell is deep and the cell width is small, the surface tension of the ink on the pore wall surface in the cell acts greatly in the light part, and the ink transfer property is inferior to that of the cell in FIG. There are a lot of points that can be seen.
Although not shown, the gravure printing plate according to Japanese Patent Application No. 6-28991 filed by the applicant of the present application is a gravure printing plate obtained by an etching method, and the shape of the cell of the light part is perpendicular to the doctor contact line. It is a long, long hole cell, and the ink in the cell is rarely scraped off by the doctor, so it is difficult for ink to drop out (non-transfer of ink at the center of the cell), but the cell width is small. The surface tension of the ink in the ink acts greatly, the transferability of the ink is inferior, and moire tends to occur. Therefore, it is essential to eliminate moire as in Japanese Patent Application Nos. 6-124628 and 6-150390. .
Although not shown, the gravure printing plate according to Japanese Patent Application No. 7-216714 filed by the applicant of the present application is a round or square cell similar to the cell of FIG. If the cell is well-distributed and has a well-distributed cell and a perfectly distributed cell is obtained, the gradation is excellent, but the cell is not opened or the cell is connected, and etching management is difficult. As in FIG. 5, the surface tension of the ink in the cell acts greatly, and the transferability of the ink is inferior.
On the other hand, in the letterpress plate and the planographic plate, the dot shape for placing the ink in the light portion is a substantially circular shape substantially corresponding to FIG.
[0003]
[Problems to be solved by the invention]
The present invention is a printing plate produced by an etching method or a laser destruction method, and by improving the dot shape of the light part or halftone part, a printed matter with good ink dispersibility can be obtained. In the intaglio, an object is to provide a printing plate that has a good transferability of ink from a cell to a printing material and that can obtain a printed material that eliminates the point where the light portion appears to be white and does not transfer. It is said.
[0004]
[Means for Solving the Problems]
The invention of the present application is a printing plate in which the dots for placing the ink on the pixels are concave portions, convex portions, or smooth portions having ink affinity, and are manufactured by an etching method or a laser destruction method. A triangular portion in which the apex and the base of the triangle are positioned in the roll circumferential surface direction so that the dots for placing the ink for forming an approximately V-shape that gradually increases in accordance with the gradation of gradation, and the triangle The present invention provides a printing plate comprising two short straight lines extending from the both ends of the bottom of the portion to the extended line of the hypotenuse.
In the present invention, the most shadow part is a shape in which hexagonal dots are spread, and the dots other than the most shadow part are positioned substantially at the center of each hexagon when the dots in the most shadow part are spread. The present invention provides a printing plate characterized by being arranged.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a first embodiment in which the printing plate of the present invention is implemented in a gravure printing plate.
This gravure printing plate has a shape in which hexagonal dots (cells) are spread in the most shadow portion (although it is not limited, for example, 80% hole area ratio). Then, dots of a size other than the most shadow part are arranged in an oblique line so as to be positioned at the center of each hexagon when the dots of the most shadow part are spread.
The cells in the light portion with a light gray scale of more than 0% to 16% or less have a generally V-shaped shape that gradually increases in correspondence with the light gray scale, and the apex and base of the triangle are in the roll circumferential direction. It consists of a triangular part that is positioned, and two short straight line parts that extend from the both ends of the bottom of the triangular part on the extension line of the hypotenuse. Since the triangular portion has a large area and width, it is etched deeper than other portions of the two short straight portions due to etching characteristics.
When the gray level is 25%, the cell has a substantially triangular shape. When a light portion or halftone cell having a gray level of more than 16% to less than 25% is provided, the cell is 16%. The shape gradually changes from a roughly V-shaped cell to a roughly triangular cell at 25%.
When the gray level is 35%, the cell has a substantially hexagonal shape. When a halftone cell having a gray level of more than 25% to less than 35% is provided, the cell is roughly triangular when the gray level is 25%. The cell gradually changes to a substantially hexagonal cell at 35%.
A halftone or shadow portion cell having a gray level of more than 35% to less than 80% has a substantially hexagonal shape that gradually increases while maintaining a similar shape so as to correspond to the gray level.
In this gravure printing plate, the depth is shallow at the two short straight portions, and the depth is etched deep at the triangular portions. The releasability of the ink from the cell increases as the cell deepens. This is considered to be caused by an increase in the adsorption force of the ink to the side wall of the cell. Thus, the releasability of the ink at the two short straight portions is good, and the two short straight portions have a good ink transferability because the surface tension at the shallow depth portion is kept small. is there. When this printing plate is not a gravure printing plate but is a relief plate, a flexographic plate having a smooth portion having ink affinity, or an offset plate, since the dots are not composed of cells, there is no relationship with the depth of the cells. However, the cells having a gradation gradation level of more than 0% to 16% extend from the triangular portion where the apex and the base of the triangle are located in the roll circumferential surface direction, to the extension of the hypotenuse from both ends of the base of the triangle. Since it has a substantially V-shape consisting of two short straight lines, the distance from one end of the dot to the other end is greater than that of the cells shown in FIGS. There is an increased cure.
As an example, a plate-making surface formed by ballad copper plating around 100 microns is mirror-polished, surface-activated, and then cured with a weak laser beam such as an argon / neon gas laser beam. A one-part photosensitive resin is applied and dried to form a photosensitive resin film having a thickness of 3 microns, and then the laser beam is main-scanned on the photosensitive resin film in a direction perpendicular to the doctor plate surface contact line. In addition, negative printing information is written on the photosensitive resin film by performing sub-scanning so that adjacent irradiated lines on the plate surface of the laser beam overlap and shift and blinking the laser beam according to the printing information. After that, development is performed to dissolve unexposed portions of the photosensitive resin film, and then the resist is heated and cured, and then etched to print positive information on the plate surface. When engraved in dots and chrome-plated to remove resist and provide printing durability, a printed matter was obtained in which the points where the light portion printed appeared white without ink transfer being equivalent to the cells shown in FIG. . Further, the dispersibility of the ink was improved as compared with the cell shown in FIG.
FIG. 2 shows an embodiment when the printing plate of the present invention is a gravure printing plate, in which 80% of the most shadowed cells are intermittently formed at the intersections of the screen lines or in the vicinity thereof to be free flow cells. Is.
(A) Disperses one dot formed by hexagonal screen lines defining one dot, and defines six dots around a dot where the screen line is not broken. A part of the screen wire is cut. In (b) and (c), the screen lines forming the dots are partially cut for all the dots. In (b), the screen lines forming dots are divided into “Z” shapes and dispersed differently in three directions, and in (c), the screen wires forming dots are divided into “Y” shapes. .
When the free flow cell is used, when ink is scratched with a doctor to fill the cell with ink, it is possible to prevent bubbles from remaining in the cell due to the flow of ink, so that the ink transfer property is good.
[0006]
FIG. 3 shows a second embodiment in which the printing plate of the present invention is implemented in a gravure printing plate. This gravure printing plate has a shape in which the most shadow portion (for example, but not limited to, for example, an aperture ratio of 80%) is spread with square dots (cells). Then, the dots having a size other than the most shadow part are aligned in such a way as to be positioned at the center of each quadrangle when the dots in the most shadow part are spread. The cells in the light portion with a light gray scale of more than 0% to 16% or less have a generally V-shaped shape that gradually increases in correspondence with the light gray scale, and the apex and base of the triangle are in the roll circumferential direction. It consists of a triangular part that is positioned, and two short straight line parts that extend from the both ends of the bottom of the triangular part on the extension line of the hypotenuse. This is the same as the first embodiment. When the gray level is 25%, the cell has a substantially triangular shape. When a light portion or halftone cell having a gray level of more than 16% to less than 25% is provided, the cell is 16%. The shape gradually changes from a roughly V-shaped cell to a roughly triangular cell at 25%. This is the same as the first embodiment. When the gray level is 35%, the cell has a substantially hexagonal shape. When a halftone cell having a gray level of more than 25% to less than 35% is provided, the cell is roughly triangular when the gray level is 25%. The cell gradually changes to a substantially hexagonal cell at 35%. This is the same as the first embodiment. A halftone cell or a shadow portion cell having a gray level of more than 35% to less than 80% has a substantially rectangular shape that gradually increases while maintaining a similar shape so as to correspond to the gray level.
[0007]
When the printing plate of the present invention is applied not only to a gravure printing plate but also to a relief printing plate and a flexographic plate or offset plate having a smooth portion having ink affinity, the ink transfer property is good and the gradation gradation can be improved. The printing plate of the present invention includes not only a roll printing plate but also a lithographic plate. Furthermore, the present invention is not limited to the plate making method shown in the above-described embodiments, that is, the method of forming a resist image by laser exposure / development and the subsequent etching method, such as an epoxy resin containing a magnetic powder on the roll surface, etc. Also included are gravure printing plates that are formed of a hard plastic film and directly engraved with a high-power laser such as a yag laser.
[0008]
【The invention's effect】
As described above, the printing plate of the present invention is a gravure plate manufactured by an etching method or a laser destruction method, a relief plate, a flexographic plate having a smooth portion having ink affinity, and an offset plate. Since the dot shape is substantially V-shaped, a printed matter having good dispersibility of ink in the light portion can be obtained.
Furthermore, according to the printing plate of the present invention, the printing plate produced by the etching method or the laser destruction method, particularly the intaglio (gravure printing plate), the dot shape of the light part can be improved to improve the shape of the dot from the cell. A printed matter can be obtained in which the transferability of the ink is good and the points where the light portion appears to be white are not transferred. That is, according to the gravure printing plate according to the present invention, in the central portion of the dot shape, similar to the cell shape of the light portion of the conventional gravure printing plate obtained by engraving the diamond needle of the electronic engraving machine shown in FIG. Since the cell depth is deep and the cell depth extends in all directions, the ink surface tension on the side wall can be kept small in the cell, and the ink transfer property is good. In addition, the ink does not pile up. The dispersibility of the ink was good, and a printed matter was obtained in which the point at which the printing of the light portion appeared white without ink transfer was equivalent to the cell shown in FIG. Further, the dispersibility of the ink was improved as compared with the cells shown in FIGS. Furthermore, the printing plate of the present invention does not cause moire.
[Brief description of the drawings]
FIG. 1 is a diagram showing the shape of dots (cells: white areas) corresponding to light and shade gradation levels according to the first embodiment when a printing plate of the present invention is a gravure printing plate.
FIG. 2 is an embodiment when the printing plate of the present invention is a gravure printing plate, in which 80% of the most shadowed cells are intermittently formed at the intersections of the screen lines or in the vicinity thereof to be free flow cells. The figure which shows the shape of a dot (cell: white area / screen line: black).
FIG. 3 is a diagram showing the shape of dots (cells: white areas) corresponding to the lightness and gradation levels in the second embodiment when the printing plate of the present invention is a gravure printing plate.
FIG. 4 is a diagram showing a cell shape of a light portion of a conventional gravure printing plate obtained by engraving diamond needles of an electronic engraving machine.
FIG. 5 is a diagram showing a cell shape of a light portion of a conventional general gravure printing plate obtained by an etching method.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15840398A JP3923656B2 (en) | 1998-05-23 | 1998-05-23 | Print version |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15840398A JP3923656B2 (en) | 1998-05-23 | 1998-05-23 | Print version |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11334235A JPH11334235A (en) | 1999-12-07 |
| JP3923656B2 true JP3923656B2 (en) | 2007-06-06 |
Family
ID=15670996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15840398A Expired - Fee Related JP3923656B2 (en) | 1998-05-23 | 1998-05-23 | Print version |
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| Country | Link |
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| JP (1) | JP3923656B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341089A (en) * | 2004-05-26 | 2005-12-08 | Dainippon Printing Co Ltd | Method for generating screen image |
| JP2009255410A (en) * | 2008-04-17 | 2009-11-05 | Dainippon Screen Mfg Co Ltd | Method of forming half tone dot image, method of forming threshold value matrix, threshold value matrix, method of manufacturing printing plate and printing plate |
| JP6319859B1 (en) * | 2017-10-02 | 2018-05-09 | 下村 恭一 | Gravure printing plate and cell shape and halftone dot forming method formed there |
| WO2021166114A1 (en) * | 2020-02-19 | 2021-08-26 | 株式会社秀峰 | Printing device and method for manufacturing printed matter |
-
1998
- 1998-05-23 JP JP15840398A patent/JP3923656B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11334235A (en) | 1999-12-07 |
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