JPH0410987A - Printing block and printing method - Google Patents

Abstract

PURPOSE:To enhance the transfer rate of ink to an object to be printed by pressing the rear of a printing block by a local press means to deform the image line grooves on the surface of the printing block toward the object to be printed. CONSTITUTION:An object 3 to be printed is arranged in opposed relation to a printing block 1 and, for example, a steel press roll 4 having a diameter of 30mm is arranged so as to make the distance from the printing block 1 adjustable and the printing block 1 and the object 3 to be printed are moved to apply appropriate deformable line pressure of 1 - 10kg/cm to the rear of the printing block 1. Further, the axial direction of the press roll 4 is allowed to coincide with the length direction of image line grooves 11. When the printing block 1 is moved, a part of the rear thereof is pressed by the press roll 4 having a small diameter and the rear of the part to be pressed is depressed so as to follow the curvature of the press roll 4 and the image line grooves 11 on the surface of the printing plate are slightly deformed toward the object to be printed. Therefore, the ink 2 having entered the image line grooves is easily transferred to the object 3 to be printed and the transfer rate of the ink 2 is enhanced and red image lines 5R having no missing dot fault can be sharply formed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a manufacturing technology for filters used in image input/output devices such as liquid crystal display devices and image sensors, and more particularly to a method for printing fine patterns on a substrate and a printing plate thereof.

[Conventional technology]

As a means of repeatedly forming fine patterns on transparent JL, as is well known, photolithography or other techniques are used to form image grooves in the desired pattern on a copper plate, etc., and this is used as a printing plate to print on glass. There is a method of printing on a substrate or the like.

[Problems to be Solved by the Invention] The resolution of the filter improves as the line width becomes narrower and clearer. Therefore, a fine pattern is drawn on a photoresist film coated on a metal plate, and the exposed metal surface is etched to form a thin drawing groove, but when the drawing width reaches a level of, for example, 10V, the photoresist It is difficult to manufacture printing plates with high precision due to problems such as insufficient resolution and difficulty in etching to a uniform depth. In addition, during printing, the image groove is narrow, which reduces the ink transfer rate to the substrate, which not only causes the color to become lighter, but also
As shown in FIG. 5, there are problems in that white defects 51 frequently occur on the object line 5 and edges become unclear. Therefore, even if the line width becomes as thin as 10 gm,
There has been a long-awaited development of a manufacturing technology that can form dark lines with high precision without producing white line defects. [Means for Solving the Problems] The present invention has been made to solve the problems of the prior art described above, and provides printing characterized in that the image groove is formed on the surface of a flexible substrate. After a predetermined amount of ink is supplied to the image groove, the back surface of the printing plate is pressurized to be locally deformable while sequentially changing its position using a pressure means that can apply local pressure, and the ink in the image groove is printed. This is a printing method characterized by sequentially transferring the particles to a substrate placed opposite to the surface of the plate.

[Effect]

According to the printing plate and printing method of the present invention, when ink is supplied to the image groove of the printing plate and the back surface of the printing plate is locally pressed while sequentially changing the position using a pressure means capable of applying local pressure, The pressurized part of a flexible printing plate locally deforms toward the front side, and the image groove on the front side opens slightly, so the ink that was in the image groove is transferred to the printing plate. It is sequentially transferred to the printing substrate placed opposite to the surface.

【Example】

Next, the present invention will be explained in more detail based on the drawings. Reference numeral 1 denotes a flexible printing plate made of urethane rubber, and in this case, printing grooves 11 having a width of 10 pm are formed on the surface at a pitch of 30 .mu.m. For example, red ink 2 is supplied to the surface of the printing plate 1, and while the ink 2 is supplied to each of the image grooves 11 by doctoring, all the ink in the non-image areas is scraped off. Next, a printing material (for example, a glass plate) is placed on the surface of the printing plate 1.
3 are installed opposite each other, and the diameter is, for example, 30. , by installing a steel pressure roll 4 whose distance to the printing plate 1 is adjustable, and moving the printing plate 1 and the printing material 3 to the right in the drawing, a pressure roll 4 made of steel is placed on the back side of the printing plate 1. Appropriate linear pressure that can be deformed from 1 to 10k
g/am (90 to 900 if the roll length is 8001
kg). Note that the axial direction of the pressure roll 4 was made to coincide with the length direction of the image line groove 11. When the printing plate 1 moves to the right in the drawing, only a part of its back surface is pressed by the pressure roll 4 with a small diameter, so the back surface of the pressed part matches the curvature of the pressure roll 4. The printing groove 11 on the surface thereof is slightly deformed toward the printing medium. Therefore, the ink 2-
is easily transferred to the printing substrate 3, so the transfer rate of the ink 2 is improved to approximately 70% (usually about 50%),
As shown in Figure 3, the red object line 5R has no white defects.
was able to be clearly formed. Subsequently, when the ink 2 is changed to green, the relative positions of the printing plate 1 and the printing material 3 are shifted by the width 20jl of the image groove 11, and pressure is transferred in the same manner, a green color is created next to the red image line 5R. It is possible to form a drawing line 5G, and furthermore, change the ink 2 to blue and print 20 in the same direction.
ji+ and pressure transfer, a blue object line 5B is formed between the red object line 5R and the green object line 5G, so that it can be used as a color filter of the so-called RGB three primary colors. As shown in FIG. 4, the printing plate 1 is fixed to a plate cylinder or the like (not shown) in a circumferential manner so as to be in rotational contact with the printing material 3, and a pressure roll 4 is installed on the inner surface side, and When the ink 2 is supplied by the ink supply roll 6 at the position of , and the ink in the non-image area is scraped off by the doctor 7, the printing material 3 is fed in synchronization with the rotation of the printing plate 1, thereby efficiently printing the material. It is also possible to form the drawing line 5 on the surface of the image 3. By the way, the present invention is not limited to the above-mentioned embodiments, so the equipment used, dimensions, etc. can be changed as appropriate. For example, printing plates include vinyl chloride resin, which is easily deformed.
Polymer resins such as polyolefin resin, silicone rubber, and acrylonitrile rubber can be used. When using a polymer resin, it is also possible to reinforce the back surface by lining it with a metal plate, punching metal, etc., or by embedding these in the back surface. In addition, the shape, size, pitch, etc. of the image groove can be formed as appropriate by means such as photolithography or engraving. It is also possible to form a release layer by applying silicone or the like to the image area or the like. In addition to the roll pressure shown in the example, pneumatic pressure,
Hydraulic pressure or the like can be used. The curvature of the portion of the pressurizing means that presses the printed material may be changed as appropriate depending on the material of the printing plate, the shape and size of the image groove, and the like. In addition to printing materials such as various glasses and polymer resins that serve as substrates for filters, ink can also be transferred to blanket cylinders for offset printing, so it can also be applied to offset printing. be.

【Effect of the invention】

As explained above, according to the printing plate and printing method of the present invention, when the back side of the printing plate is pressed by a pressure means capable of applying local pressure, the image grooves on the front surface are deformed toward the substrate. The ink transfers easily to the printing substrate, and the ink transfer rate improves. Therefore, even if the print width is reduced to about 10j11, a large amount of ink can be transferred to the printing substrate to form thick print lines, eliminating the occurrence of white defects and creating dark print lines. It is now possible to form.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of a printing plate, Fig. 2 is an explanatory diagram showing a printing method, Fig. 3 is an explanatory diagram of printed lines, Fig. 4 is an explanatory diagram showing another printing method, FIG. 5 is an explanatory diagram of drawing lines according to the prior art. DESCRIPTION OF SYMBOLS 1... Printing plate, 11... Image groove, 2... Ink, 3... Printing substrate, 4... Pressure roll, 5... Object line, 6... Ink supply roll , 7...Doctor

Claims (2)

[Claims] (1) A printing plate characterized in that an image groove is formed on the surface of a flexible substrate. (2) After supplying a predetermined amount of ink to the image groove, the back surface of the printing plate is locally deformably pressurized while sequentially changing its position using a pressure means capable of applying local pressure, and the ink in the image groove is applied to the printing plate. A printing method characterized by successive transfer to a substrate placed opposite to the surface.