JP2001030644A - Printing plate and printing method - Google Patents

Abstract

(57) [Problem] To provide a printing plate capable of printing a high-definition pattern. SOLUTION: In a printing plate for forming a multicolor pattern on a base material by printing, an intaglio plate having an intaglio in which a concave portion for receiving ink is formed on a top side of a convex portion formed on the surface of a plate cylinder is used. Then, the ink filled in the intaglio plate of the convex portion is transferred to form an ink pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate and a printing method, and more particularly to a printing plate that can be used for high-precision printing. The present invention relates to a high-precision printing plate and a printing method that can be applied to manufacturing by printing a filter.

[0002]

2. Description of the Related Art Methods such as photolithography and electrodeposition are used to form electronic materials having a high-definition pattern. These methods are manufactured through a number of steps, and mass production. Etc. require large-scale equipment. On the other hand, a method of forming a pattern by printing is a method suitable for mass production, but has a problem that a pattern obtained by printing is inferior to photolithography in its accuracy and the like.

As a printing method for forming a high-definition pattern, methods such as offset printing and gravure printing are known. In offset printing, the ink is transferred to the blanket and then the ink is transferred from the blanket onto the print substrate.However, when the blanket is transferred to the print substrate, a change in the shape occurs, and the pixel shape is accurately determined. There was a problem that was not reproduced. Also, in gravure printing,
The method of transferring the image after printing on a blanket or the method of directly transferring the ink from the intaglio to the printing medium without using a blanket also has a problem that the shape of the pixel is not accurately reproduced.

Therefore, as described in Japanese Patent Application Laid-Open No. Hei 5-169614, the shape of the cells is improved so that the transferred image from the cells on the lithographic plate to the blanket is highly accurate, Methods such as increasing the transfer rate have been proposed, but these methods cannot transfer continuously, and are limited to single-wafer apparatuses. It has been difficult to form an accurate pixel in μm units. In order to solve these problems, the present applicant has transferred an intaglio ink pattern formed on a plate cylinder to a belt-shaped substrate provided with a layer having viscoelasticity on the surface, and transferred the ink pattern transferred onto the substrate. Has been proposed to form a high-definition pattern by transferring an image onto a substrate.

In addition, the applicant of the present invention has found that in the transfer of the intaglio ink pattern, it may be difficult to transfer the ink pattern later depending on the height of the ink pattern already formed on the substrate. In order to solve such a problem, a printing method combining an intaglio plate and a relief plate as described below has been proposed.

FIG. 4 is a view for explaining a printing method in which the ink pattern is transferred by the relief printing plate after the transfer of the intaglio printing ink pattern. FIG. 4A is a diagram illustrating printing of an ink pattern by an intaglio printing apparatus using an intaglio printing apparatus on a substrate used to transfer an ink pattern onto a substrate. The operation of the intaglio printing device 20 used in the printing method of the present invention will be described. The ink 5 in the ink reservoir 11 is uniformly attached to the surface of the rotating furnisher roller 21, and then the printing pattern 23 formed on the rotating gravure cylinder 22 in contact with the furnisher roller 21 is filled with ink. Then, the surface of the ink of the print pattern 23 is shaped by the doctor 14. Next, the substrate 17 is continuously supplied to the surface of the gravure cylinder 22 and the gravure cylinder 2
The ink pattern 16 filled in the pattern of the gravure cylinder 22 is transferred onto the surface of the base material 17 by being pressed by the rotating impression cylinder 15 from the surface opposite to the surface 2.

Next, as shown in FIG. 4B, an ink pattern is formed by the relief printing device 24 on the base material 17 on which the ink patterns 16a and 16b are formed by the intaglio printing device 20. The letterpress printing device 24 includes the ink reservoir 1
1, fountain roll 12, anilox roll 1
3. Flexo plate 25, ink reservoir 11
After the ink 5 is uniformly attached to the surface of the fountain roll 12, the ink 5 is transferred to the anilox roll 13, and the ink is further applied from the anilox roll 13 to the convex portion of the flexographic plate 25. Is transferred to the ink pattern 16c.

At the time of printing by the letterpress printing device 24, the ink patterns 16a and 16a
Since b is formed, when the ink is transferred from the convex portion of the flexographic plate to the region between these ink patterns,
The ink patterns 16a and 16b act as walls for the ink, and the ink patterns 16
c is exactly formed.

However, as shown in the cross-sectional view of the relief printing plate in FIG. 5A, the ink deposited on the flat surface of the projection 26 of the flexographic printing plate 25 shows that the ink deposition portion 27
And poorly adhered portions 28 where the ink is not sufficiently adhered are formed, and the ink transferred by printing is also shown in FIG.
As shown in the printed ink pattern shown in (1), problems such as the occurrence of a hollow portion 29 where ink transfer is poor, a portion 30 where linearity is poor, and the like are evident. These phenomena are
Although this was not a problem for general printed matter,
In the case of a fine pattern of not more than 00 μm, such non-uniformity of the ink transfer may not be negligible, which may be a problem in forming a highly accurate colored pattern by printing.

[0010]

SUMMARY OF THE INVENTION The present invention is to provide a printing plate which can be used for forming a high-definition pattern by a printing method. It is an object of the present invention to provide a printing plate having good linearity of an ink pattern.

[0011]

SUMMARY OF THE INVENTION The present invention provides a printing plate for forming a multicolor pattern on a substrate by printing, wherein a concave portion for receiving ink is provided on a top side of a convex portion formed on the surface of the plate cylinder. This is a printing plate composed of a concavo-convex plate having a formed intaglio. In the printing method, the intaglio plate ink is transferred using an intaglio plate having an intaglio plate in which a concave portion for receiving ink is formed on the top side of the convex portion formed on the surface of the plate cylinder. Further, in the printing method, the ink pattern in the intaglio plate of the plate cylinder is transferred to form a convex ink pattern, and the convex portion formed on the surface of the plate cylinder is formed between the formed convex ink patterns. This is a printing method in which printing is performed using a plate cylinder having a concavo-convex plate formed with a concave portion for receiving ink formed on the top side.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The relief printing plate of the present invention having an intaglio plate on the top side of the projections has a good shape for adhering ink to the ink transfer surface of the relief plate. And deterioration of linearity.

The present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a cross section of a printing plate according to one embodiment of the present invention. The printing plate of the present invention comprises an intaglio plate 1 in which an intaglio plate 4 serving as an ink receiving portion is formed on an ink transfer surface 3 on the top side of the relief plate 2, and the ink 5 filled in the intaglio plate 4 during printing. Is transferred. The unevenness formed on the printing plate of the present invention can be produced by machining or etching the surface of a metal tubular body. The height H to the top of the letterpress is 0.1 m with respect to the thickness of the colored pattern to be printed.
m to 5 mm. The relief printing plate 2 in the relief printing plate 1 is formed at a pitch 6 that matches the ink pattern to be formed by printing. Width W1 of letterpress printing surface
On the other hand, the width W2 of the intaglio formed at the center of the letterpress is (W
1-5 μm) to (W1-50 μm). Further, it is preferable that the depth of the intaglio is 1 μm to 100 μm.

Further, the concavo-convex printing plate of the present invention is not limited to one produced by cutting and etching a metal cylinder, but may be made of a material such as rubber provided on the surface of a plate cylinder made of metal.
A relief plate having an intaglio plate therein may be formed. The printing of the three-color pattern of R, G, and B using the concavo-convex printing plate of the present invention can be performed only by the concavo-convex printing plate of the present invention. Printing may be performed by the uneven plate of the present invention.

FIG. 2 is a view for explaining a printing apparatus using the concavo-convex printing plate of the present invention. The relief printing device 10 includes an ink reservoir 11, a fountain roll 12, an anilox roll 13, a doctor 14, a relief plate 1, and an impression cylinder 15, and the ink of the ink reservoir 11 is uniformly attached to the surface of the fountain roll 12. After the transfer, the ink is transferred to the anilox roll 13, the ink on the anilox roll 13 surface is shaped by the doctor 14, and then the ink is filled in the intaglio 4 of the uneven plate 1. The intaglio 4 of the intaglio 1 between the first color ink pattern 16a and the second color ink pattern 16b on the substrate 17 on which the patterns 16a and 16b are formed.
The ink pattern is formed on the substrate by pressing and transferring the ink by the impression cylinder 15.

In the concavo-convex printing plate of the present invention, since the intaglio printing is formed on the convex portions, the already formed ink patterns 16a,
Even if there is 6b, the thickness of the ink pattern does not become an obstacle, and the ink pattern can be formed accurately. In addition, since the ink pattern formed by the concave and convex plate is formed by the intaglio plate, it is easy to form an ink pattern with an accurate shape, and it is possible to prevent poor ink transfer and pinhole formation.

The ink pattern formed by the printing method of the present invention may be one in which an ink pattern having the same composition is formed or one in which ink patterns having different compositions are sequentially formed. As a printing apparatus using the printing plate of the present invention, any of a stack type printing apparatus in which a printing unit is independent for each color and a single cylinder satellite type can be used. In the single-body satellite type, it is easy to increase the registration accuracy of each color.

FIG. 3 is a view for explaining a cross section of an ink pattern formed by combining intaglio printing and printing with the intaglio plate of the present invention. The intaglio ink was transferred to a predetermined area of the substrate 17 to form ink patterns 16a and 16b.
The ink pattern 16a and the ink pattern 16b
Is arranged so as to form a wall with respect to the ink to be formed next, and the ink is transferred from the intaglio of the relief printing plate using the ink patterns 16a and 16b as walls. The ink patterns 16a and 16b formed by the intaglio match the shape of the intaglio and have high shape retention, and the ink pattern 16c formed by the intaglio between the ink patterns 16a and 16b is Since the positioning is performed by the ink patterns 16a and 16b formed by the intaglio, a highly accurate ink pattern can be obtained.

In general, the ink patterns 16a and 16b to which the intaglio ink is transferred have a curved surface.
Next, since the ink pattern is formed by the relief plate, the ink pattern formed earlier does not become an obstacle, and the area between the ink patterns is filled with the ink from the relief plate, thereby effecting the leveling of the surface of the ink. Thus, an ink pattern 16c having a flat surface is formed.

Further, the method of the present invention is suitable for producing a color filter composed of three colors of red, blue and green,
First, after forming the ink patterns of two of these colors by the intaglio, the third color ink pattern can be formed by the intaglio plate.

Not only when forming three color ink patterns, but also when forming four color ink patterns of red, blue, green and black, and when forming ink patterns with two colors or inks having different characteristics. First, after forming an ink pattern having an accurate shape with an intaglio plate, a printed material having an accurate ink pattern can be formed by forming another ink pattern with an uneven plate.

In a relief printing plate such as a flexographic printing plate, it has been difficult to adjust the line width of the ink pattern with high precision. Since the size of the letterpress ink pattern to be printed later is regulated by the ink pattern of the printed intaglio, a high-precision ink pattern with an adjusted line width can be obtained.

Further, according to the printing method using a concavo-convex printing plate of the present invention, not only printing directly on a substrate but also printing on a substrate used for transfer to the substrate, and then transferring to the substrate can be performed. It is preferable to use a substrate having a viscoelastic layer having viscoelasticity formed on the surface of a support as a substrate used for transfer to a printing medium. As a result, the ink pattern printed on the substrate is completely transferred the ink shape of the intaglio, and an accurate ink pattern is obtained.
Next, it is possible to obtain a highly accurate ink pattern formed by the uneven plate.

The printing plate of the present invention uses an ink pattern formed by printing an ink pattern on a substrate having a viscoelastic layer formed on a support.
The solvent gradually evaporates from the surface and the properties of the transfer ink pattern become stable, but since the viscoelastic layer formed on the support has the function of absorbing the ink solvent,
When the ink is transferred to the viscoelastic layer, the solvent in the ink is absorbed by the viscoelastic layer, the solvent in the ink pattern is reduced, and the viscosity of the ink is increased, and the pattern shape retention is improved. Since such characteristics are developed from the start of the transfer to the viscoelastic layer, the shape of the ink pattern is accurately transferred onto the viscoelastic layer. Next, an ink pattern having excellent shape stability can be transferred by transferring the ink pattern formed on the obtained substrate to the substrate.

As a support for the substrate, a synthetic resin film such as polyethylene terephthalate, polyethylene naphthalate, and polyimide can be used.

The viscoelastic layer mainly has viscoelasticity, and dimethylpolysiloxane, butyl acrylate, 2-ethylhexyl acrylate, butyl methacrylate,
Isocyanate ethyl or methacrylate copolymer, dimethylpolysiloxane, methylphenylpolysiloxane, or methylfluoropolysiloxane, stearyl (meth) acrylate as an acrylic copolymer,
a layer composed of a material such as n-butyl (meth) acrylate, lauryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, or a copolymer of 2-ethylhexyl (meth) acrylate; and a loss tangent tan δ Is 0.01 to 0.2 and the complex elastic modulus is 10 ⁶
-10 ⁷ dyne / cm ² , critical surface tension is 17-37 d
yne / cm is preferable. In addition, (meth) acrylate means one containing at least one of acrylate and methacrylate.

When a color filter is produced, two ink patterns of three colors of R, G and B are first formed on a substrate by intaglio printing, and then the third color ink pattern is formed. It is preferable to form a color filter by forming an uneven plate and transferring the R, G, and B patterns formed on this description to a substrate.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments using the printing plate of the present invention will be described. Example 1 A surface of a cylinder plate made of an aluminum alloy having a diameter of 191 mm was cut, and the height of the plate was set to 300 μm so that the direction of the ridge was parallel to a plane perpendicular to the rotation axis of the cylinder plate.
Protrusion patterns having a top width of 100 μm and a bottom width of 110 μm were formed at intervals of 360 μm. Further, on the top side of the projection, a width of 70 μm and a depth of 3 μm are parallel to the projection.
Was formed on the printing apparatus as a concave and convex plate having a concave plate at the tip of the convex portion.

Then, dimethylpolysiloxane (weight average molecular weight: 100%) was placed on a support made of polyethylene terephthalate (Teonex, Teijin) having a thickness of 50 μm.
10,000) was applied to a thickness of 20 μm using 2,5-dimethyl-2,5-di-t-butylferroxyhexane as a crosslinking agent,
After drying, curing and winding, a belt-shaped substrate was formed. On this substrate, 15 parts by weight of R: anthraquinone, G: copper phthalocyanine green, and B: copper phthalocyanine as pigments of each color of R, G, and B, and polypropylene glycol, hexamethylene diisocyanate, and ethylenediamine are polycondensed. After printing R and B in intaglio using intaglio printing ink of each color of R, G and B prepared with 15 parts by weight of polyurethane resin and 70 parts by weight of a mixed solvent of toluene and methyl ethyl ketone (mixing ratio 1: 1). , G
Was printed with the concavo-convex plate of the present invention. The printing is performed by a satellite method using a printing speed of 50 m / min, a tension of 2 kg / m, a printing pressure of ² kg / m ² , a doctor linear pressure of 1 kg / cm, a doctor angle of 45 °, and a drying angle of 100 ° C. with hot air. A pattern of each color was formed in the order of G.

The obtained R, G, and B patterns have good pattern edges, and the linearity of the G pattern formed in the third color shows that the displacement of the edge position using the conventional letterpress is ± 15 μm. On the other hand, a good product having an edge displacement of ± 2 μm was obtained.

In the printing of the second and subsequent colors, a stable printing pattern could be obtained without any blurring phenomenon due to the thickness of the previously printed ink pattern. The obtained R, G, and B patterns were transferred to glass to produce a color filter having a highly accurate colored pattern formed thereon.

Example 2 A surface of a cylinder plate made of aluminum alloy having a diameter of 120 mm was cut, and a height of 300 μm was set so that the direction of the ridge was parallel to a plane perpendicular to the rotation axis of the cylinder plate.
Protrusion patterns having a top width of 100 μm and a bottom width of 110 μm were formed at intervals of 360 μm. Further, on the top side of the projection, a width of 70 μm and a depth of 3 μm are parallel to the projection.
Was formed on the printing apparatus as a concave and convex plate having a concave plate at the tip of the convex portion.

Next, an acrylic UV-curable resin composition (JELCON USL manufactured by Jujo Chemical) was applied to a thickness of 50 μm on a support made of polyethylene terephthalate (Teonex manufactured by Teijin) having a thickness of 50 μm.
After drying and curing, the film was wound up to form a belt-shaped substrate.

To this substrate, R: anthraquinone, G: copper phthalocyanine green, B: 15 parts by weight of copper phthalocyanine, polypropylene glycol, hexamethylene diisocyanate, and ethylenediamine were used as pigments of each color of R, G, and B. R prepared with 15 parts by weight of a polycondensed polyurethane resin, 70 parts by weight of a mixed solvent of toluene and methyl ethyl ketone (mixing ratio 1: 1),
R, G, B using intaglio printing ink of each color of G, B
Were printed on a concavo-convex plate. The printing was performed by a satellite method using a printing speed of 50 m / min, a tension of 2 kg / m, and a printing pressure of 2 kg / m.
kg / m ² , doctor linear pressure 1 kg / cm, doctor angle 45 °, R
A pattern of each color was formed in order of B and G.

The obtained R, G, and B patterns have good pattern edges, and the linearity of the G pattern formed in the third color shows that the displacement of the edge position using the conventional letterpress is ± 15 μm. On the other hand, a good product having an edge displacement of ± 2 μm was obtained. R, G, B obtained
Was transferred to glass to produce a color filter on which a highly accurate colored pattern was formed.

[0036]

According to the printing plate of the present invention, since the intaglio plate is formed on the convex portion, it is possible to improve the ink transfer failure caused by the letterpress printing and to form a highly accurate ink pattern. In printing methods where was essential,
The high precision characteristics of the intaglio printing are obtained.
Electronic materials and the like that require high precision, which have been required to be manufactured by photolithography, can also be manufactured by a printing method.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a cross section of a printing plate according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a printing apparatus using the concavo-convex printing plate of the present invention.

FIG. 3 is a diagram illustrating a cross section of an ink pattern formed by combining intaglio printing and printing with a concavo-convex printing plate of the present invention.

FIG. 4 is a diagram for explaining a printing method in which an ink pattern is transferred by a relief printing plate after transferring the ink pattern of the intaglio printing.

FIG. 5 is a diagram illustrating an ink pattern using a conventional relief printing plate.

[Explanation of symbols]

1: Uneven plate, 2 ... relief plate, 3 ... ink transfer surface, 4 ... intaglio plate,
5 ... ink, 6 ... pitch, 10 ... concave printing device, 11
… Ink reservoir, 12 fountain roll, 13 anilox roll, 14 doctor, 15 impression cylinder, 16a,
16b, 16c: ink pattern, 17: base material, 20 ...
Intaglio printing device, 21 furnisher roller, 22 gravure cylinder, 23 printing pattern, 24 letterpress printing device,
25: flexographic plate, 26: convex portion, 27: ink adhering portion,
28: defective adhesion part, 29: hollow part, 30: poor linearity

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akio Sonehara 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Mio Makino 1-chome, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1-1 F-term in Dai Nippon Printing Co., Ltd. (reference) 2H113 AA01 AA02 BA03 BA17 CA17 DA04 DA46 2H114 AA02 AA09 AA10 DA04 DA46 EA04

Claims (3)

[Claims] 1. A printing plate for forming a multicolor pattern on a base material by printing, wherein the printing plate has an intaglio plate in which a concave portion for receiving ink is formed on the top side of the convex portion formed on the surface of the plate cylinder. A printing plate characterized by becoming. 2. A printing method, wherein the intaglio printing ink is transferred using an intaglio printing plate having an intaglio plate having a concave portion for receiving ink at a top portion of a convex portion formed on the surface of the plate cylinder. The printing method you want. 3. A printing method, wherein the ink pattern in the intaglio of the plate cylinder is transferred to form a convex ink pattern.
It is characterized in that printing is performed using a plate cylinder having a concavo-convex plate in which a concave portion for receiving ink is formed on the top side of the convex portion formed on the surface of the plate cylinder between the formed convex ink patterns. The printing method you want.