JP2002361997A - Printing method for electrode pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for printing an electrode pattern on a glass substrate without generating a whisker-like flaw. SOLUTION: In the method for printing the electrode pattern on the glass substrate by an offset printing method using conductive ink containing at least a conductive powder and an organic component capable of being removed by baking, the stringing of the ink generated when a printing plate is filled with the conductive ink from an ink filling roll is cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing an electrode pattern.

[0002]

2. Description of the Related Art Conventionally, it has been required that a fine pattern of an electrode in an electronic circuit, an image display device, or the like can be formed with higher precision and at a lower manufacturing cost.

Conventionally, as a method for forming a fine electrode pattern, a pattern is formed by a screen printing method or a photolithography method using a pattern forming paste containing conductive powder, and then fired to form an electrode pattern. There is a way. However, in the electrode pattern formation by the screen printing method, there is a limitation in printing accuracy due to the elongation of the mesh material constituting the screen printing plate, and a mesh formed in the formed pattern or a blur of the pattern occurs, and the electrode pattern is formed. There is a problem that edge accuracy is low. In addition, although the photolithography method can form a highly accurate electrode pattern, the manufacturing process is complicated, the material loss is large, and the reduction in manufacturing cost is limited.

For this reason, attempts have been made to reduce the cost of forming a fine electrode pattern by using an offset printing method which has a simple process and has high productivity. In this offset printing method, a conductive ink containing conductive powder is supplied to an intaglio or lithographic printing plate, the ink pattern on the printing plate is transferred onto a substrate via a blanket, and then baked to form an organic component. Is decomposed and volatilized to form an electrode pattern.

[0005]

However, using an offset printing machine as described above, a thick asperity print of about 5 to 20 μm is formed on a glass substrate by offset printing, followed by baking to form an electrode pattern of 2 to 10 μm. Attempting to form it will cause the following problems.

That is, during the process of filling the printing plate (waterless offset plate) with the ink from the ink filling roll, the cohesive failure of the ink causes a whisker-like defect on the waterless plate. This whisker-like defect becomes a whisker-like defect 3 protruding around the print pattern 2 as shown in FIG. In FIG. 1, reference numeral 1 denotes a glass substrate.

It is an object of the present invention to provide a method for printing an electrode pattern on a glass substrate without causing whisker-like defects.

[0008]

SUMMARY OF THE INVENTION The present inventor has studied to solve the above-mentioned problems. As a result of the research, the present inventors have suppressed the whisker-like defects by cutting the stringing of the ink generated between the ink filling roll and the printing plate. The inventors have found that the present invention has been completed and completed the present invention. The invention according to claim 1 solves the above problem, and prints an electrode pattern on a glass substrate by an offset printing method using a conductive ink containing at least a conductive powder and an organic component that can be removed by firing. The method for printing an electrode pattern is characterized in that the stringing of the ink generated when the printing plate is filled with the conductive ink from the ink filling roll is cut.

In the present invention, the stringing of the ink is cut by irradiating the stringing portion with a laser, blowing air to the stringing portion, or cutting the stringing portion with a blade. Can be.

[0010] According to the method of the present invention, by removing the stringiness of the ink generated when the printing plate is filled with the conductive ink from the ink filling roll, a whisker defect that jumps out from the ink filled portion of the printing plate in a beard shape is cut. Generation can be prevented.

[0011]

2 and 3 show an offset printing press used in the method of the present invention, FIG. 2 shows a schematic plan view,
FIG. 3 is a schematic side view. The offset printing press 11 includes a base 12, a printing platen 13 and a printing plate 14 arranged at predetermined intervals on the base 12, and two printing plates laid in parallel on the base 12. And a print head 16 movable on the guide rails 15 by a moving mechanism (not shown).

The print head 16 includes a blanket roll 17 that can move up and down and a filling roll 18. Behind the blanket roll 17 and the filling roll 18, a laser irradiation device 24 not provided in the conventional printing apparatus is provided. On the other hand, the base 12 is provided with a supply inking roll group 19 for supplying ink and an ink blade 20 for storing conductive ink.

In the offset printing press 11, a glass substrate 21 as a printing medium is placed on a printing platen 13, and a printing plate 22 is placed on a printing plate 14. Then, the print head 16 first moves on the guide rails 15, 15 toward the supply inking roll group 19 to a position where the filling roll 18 faces the supply inking roll group 19. Then, at a position where the filling roll 18 and the supply inking roll group 19 face each other, ink is supplied from the supply inking roll group 19 to the filling roll 18. Next, the print head 16 moves on the guide rails 15, 15 toward the printing plate 14, and the printing plate 22 is filled with ink from the roll of the filling roll 18. At this time, when the ink stringing 23 occurs between the filling roll 18 and the printing plate 22, the laser irradiation device 2
By irradiating a laser to the ink threading portion from 4, the ink threading portion is cut.

After the printing plate 22 is filled with ink, the print head 16 returns on the guide rails 15, 15 to the supply inking roll group 19 side of the base 12, and again enters the filling roll 18 from the supply inking roll group 19. Ink is supplied.
During this time, the blanket 17 is at an elevated position so as not to contact the printing plate 22.

Next, the print head 16 moves toward the printing platen 13 with the blanket roll 17 lowered to the printing position. The printing head 16 is connected to the printing plate 1
4, the ink on the image portion of the printing plate 22 is transferred to the blanket 17, and at the same time, the printing plate 22 is filled with the ink by the rolls of the filling roll 18. The print head 16 further moves toward the printing platen 13, and the ink is transferred from the blanket roll 17 to the glass substrate 21, which is the printing object placed on the printing platen 13. Thereafter, the printing head 16 returns to the supply inking roll group 19.

As described above, a fine electrode pattern without beard-like defects is formed on a glass substrate.

The ink threading portion can also be cut by attaching an air ejecting device instead of the laser irradiation device and blowing air to the ink threading portion. Alternatively, a blade may be attached in place of the laser irradiation device, and the blade may cut the portion where ink is drawn.

Hereinafter, the present invention will be described with reference to examples.

Example 1 A conductive ink having the following composition was prepared. Composition of conductive ink・ Silver powder 77.5 parts by weight (tap density 4.5 g / cm ² , surface area 2.4 m ² , average particle size 0.3 μm) ・ Glass frit (Bi ₂ O ₃ glass) 2.5 parts by weight (coefficient of thermal expansion: 81 × 10 ^-7 / ° C, softening point: 525 ° C, average particle size: 0.9 μm) ・ Resin: 20 parts by weight (allyl ether-maleic anhydride-styrene copolymer)

Next, an offset printing machine having a print head shown in FIGS. 2 and 3 was used, and a silicone rubber blanket was mounted as a blanket roll. When filling the printing plate with the prepared conductive ink, ink stringing occurred between the filling roll and the printing plate, but the stringing portion was cut by irradiating a laser to the stringing portion.
After that, the ink filled in the printing plate is transferred to a blanket, and the blanket is further transferred to a glass substrate (soda glass, 3
(60 mm × 450 mm, thickness 2.1 mm) was subjected to pattern printing under the following printing conditions.

[0021]

The printed matter formed on the glass substrate after printing was examined for the number of whisker-like pattern defects.
Only 15 whiskers were detected per 60 mm × 450 mm area.

(Comparative Example) Printing was performed in the same manner as in the example, except that the stringing of the ink was not cut. When the number of whisker-like pattern defects was examined for the printed matter formed on the glass substrate after printing, 427 whisker-like defects were detected per 360 mm × 450 mm area.

[0024]

As described in detail above, according to the present invention, an electrode pattern is printed on a glass substrate by an offset printing method using a conductive ink containing at least a conductive powder and an organic component which can be removed by firing. In a method of printing an electrode pattern, an electrode pattern is printed on a glass substrate without causing a whisker-like defect by cutting a string of ink generated when filling a printing plate with a conductive ink from an ink filling roll. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state in which a whisker-like defect has occurred in a printing plate.

FIG. 2 is a schematic plan view of a printing press used in the method of the present invention.

FIG. 3 is a schematic side view of a printing press used in the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Offset printing machine 12 Base 13 Printing platen 14 Printing plate board 15 Guide rail 16 Printing head 17 Blanket roll 18 Filling roll 19 Supply inking roll group 20 Ink blade 21 Glass substrate 22 Printing plate 23 Threading part 24 Laser irradiation device 1 glass substrate 2 print pattern 3 whisker-like defect

Claims (4)

[Claims] 1. An electrode pattern printing method for printing an electrode pattern on a glass substrate by an offset printing method using a conductive ink containing at least a conductive powder and an organic component that can be removed by firing. A method for printing an electrode pattern, comprising cutting a string of ink generated when a plate is filled with conductive ink. 2. The method for printing an electrode pattern according to claim 1, wherein the stringing of the ink is cut by irradiating a laser to the stringing portion. 3. The method for printing an electrode pattern according to claim 1, wherein the stringing of the ink is cut by blowing air to the stringing portion. 4. The method for printing an electrode pattern according to claim 1, wherein the stringing of the ink is cut by cutting the stringing portion with a blade.