JPH0569529A - Gravure printing method and intaglio used therefor - Google Patents

Abstract

(57) [Abstract] [Purpose] In gravure printing, not only the print density of the entire design such as fine lines can be made uniform, but also the linearity of the edge portion of the design can be improved. [Structure] The structure of the recesses of the intaglio plate 10 itself includes a first recess 11 having a fine width surrounding the outside and a large number of second recesses 12 inside the first recess 11 and independent from each other. To have.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for printing a pattern, such as a bar code or a color pixel of a color filter, having a solid inner portion surrounded by contour lines by a gravure method, and in particular, a sharp printing method. It relates to a technique effective in obtaining an edge.

[0002]

[Prior Art and Problems Thereof] In general, gravure printing has a larger amount of ink deposition than other printing methods and is easy to print on a printing material other than paper such as a plastic film. In order to take advantage of such gravure printing, it is conceivable to print a pattern, such as a color pixel of a barcode or a color filter, in which the inner portion surrounded by the outline is solid by the gravure method. In that case, in order to improve the printing accuracy of the design, a method of increasing the density of the recesses (cells) for accumulating ink can be considered (see, for example, Japanese Patent Publication No. 3-25769).

When the density of the recesses is increased, the print density can be made uniform over the entire pattern, but it is inevitable that the printed pattern has jagged edges. This jaggedness is due to the influence of the screen eyes. Therefore, as a result of various investigations focusing on a plate-making pattern that does not use a screen, the following was found.
First, as the concave portion 30, if the whole is solid as shown in FIG. 2A, the density distribution of the printed pattern is bad (the density of the central portion of the pattern is low, and in some cases (A white line appears), which is far from the point of concentration distribution for practical use. Therefore, in order to improve the concentration distribution, a stripe-shaped recess 50 as shown in FIG. 2B is used. According to this (B), the density distribution of printing is good, but the ink is excessively accumulated in the T-shaped portion 52, and the reproducibility of that portion is not good.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned examination results, and can not only make the print density of the entire pattern uniform but also improve the linearity of the edge portion of the pattern. It is intended to provide a gravure printing technology capable of performing.

[0005]

According to the present invention, an intaglio plate 10 as shown in FIG. 1, that is, a first recess 11 having a continuous fine width along a contour line of a pattern to be printed,
An intaglio which is provided inside the first recess 11 and has a large number of second recesses 12 independent of each other is used. The width of the first recess 11 is preferably as small as possible in order to increase the sharpness of the edge, and is preferably set to, for example, 0.02 or 0.03 mm, which is the minimum line width that can be printed by the intaglio plate. The width of the first recess 11 is equal to or smaller than the width of the second recess 12. Also, it is preferable that the large number of second recesses 12 scattered in an island shape inside the first recesses 11 are provided at the highest density. For example, when the line thickness due to printing is L (depending on the type of printing medium and printing conditions, the value of L is from several tens of μm to 60 or 70 μm), a pitch similar to that of L Thus, each recess 12 is provided. Outer first recess 1
1 is effective in obtaining a sharp edge, and
The large number of second recesses 12 on the inner side are effective in obtaining a uniform density distribution, and in combination, the patterns having sharp edges and uniform density distribution can be printed by the gravure method. The present invention can obtain an effective effect by applying it to a fine line or a fine line having a width of 1 mm or less.

[0006]

EXAMPLE In the intaglio plate 10 shown in FIG. 1, the overall size of one pattern is 0.28 mm in width and 49.2 mm in length, the width of the first recess 11 is 30 μm, and the size of the second recess 12 is Is 3
Printing was performed on a plastic film having a thickness of 100 to 200 μm under the following conditions by using a film having a size of 0 μm × 200 μm and a pitch of 60 μm. For comparison, conventional printing conditions are also shown. This Invention Conventional Ink # 3 Zancup # 3 Zancup 30-40 seconds solvent type About 20 seconds solvent type Printing pressure 3 kg / cm ² 2-3 kg / cm ² Printing speed 10 to 12 m / min 400 to 500 m / min Depth of recess 20 to 40 μm 40 μm Doctor angle Approximately perpendicular to the tangent to the plate surface 65 ° White line screen not used According to conventional conditions In the case of the invention, the edges were jagged, but in the case of the present invention, the line thickness was about 60 μm, but the density distribution was good, and a printed product with sharp edges could be obtained. Therefore,
By using an intaglio that takes line thickening into consideration, it was possible to obtain a printed matter that was good in terms of dimensions.

[0007]

According to the present invention, the structure of the concave portion of the intaglio plate 10 itself has the first concave portion 11 having a fine width surrounding the outside.
In addition, since there are a large number of second recesses 12 that are independent of each other inside the first recess 11, it is possible not only to make the print density of the entire design uniform, but also the edges of the design. The linearity of the part can be improved.

[Brief description of drawings]

FIG. 1 is a partial plan view showing an example of an intaglio plate used in the present invention.

FIG. 2 is a plan view for explaining various examples of intaglio plates in the process of obtaining the present invention.

[Explanation of symbols]

 10 Intaglio 11 First Recess 12 Second Recess

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Oizumi 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd. (72) Inventor Takuji Oikawa 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Joint Printing Co., Ltd. (72) Yoshihiro Yamamoto, 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd. (72) Inventor Tatsuhiko Murai, 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd. (72) Inventor Hirofumi Ide 4-14-12 Koishikawa, Bunkyo-ku, Tokyo, Kyodo Printing Co., Ltd. (72) Inventor Kazuo Otake 4-14-12 Koishikawa, Bunkyo-ku, Tokyo, Kyodo Printing (72) Inventor Ryoichi Kishi 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd.

Claims (6)

[Claims] 1. A method of printing by a gravure method a pattern having a solid inner portion surrounded by contour lines,
A first recess having a fine width that is continuous along the contour line;
A gravure printing method, characterized in that an intaglio provided inside the first concave portion and having a large number of second concave portions independent of each other is used. 2. The gravure printing method according to claim 1, wherein the width of the first recess is set to be equal to or less than the width of the second recess. 3. The gravure printing method according to claim 1, wherein the pattern is a small thin line having a width of 1 mm or less. 4. The gravure printing method according to claim 3, wherein the pattern is stripe-shaped color pixels of a color filter. 5. The gravure printing method according to claim 1, wherein the doctor blade is caused to act substantially upright with respect to a tangent line of the plate surface. 6. A gravure intaglio plate for obtaining a pattern in which an inner portion surrounded by a contour line is a solid pattern, the first recess having a fine width continuous along the contour line, and the first recess. 1
And a plurality of second concave portions independent of each other inside the concave portion.