JPH04176691A - Mirror surface blanket and production thereof - Google Patents

Abstract

PURPOSE:To hold the reproducibility of a fine line of a 10mum level, in a mirror surface blanket used in offset printing, by providing a mirror surface fine pattern transfer layer to the uppermost layer of the surface and using a liquid room temp. curable resin or rubber containing no powder filler as the material of the transfer layer. CONSTITUTION:A blanket 1 for offset printing is used as a base blanket 11 and constituted by appropriately laminating a plurality of reinforcing cloths 2a, 2b, 2c, 2d, a sponge layer 3, a surface rubber layer 4 and an adhesive layer 5. A fine pattern ink transfer layer 6 is formed on the blanket 1 and it is indispensable that the elastomer forming the transfer layer 6 is composed of a liquid resin or rubber containing no filler in order to prevent the pinhole due to the detachment of the filler. As the material satisfying the necessary condition of the elastomer, for example, a solventless epoxy resin, RTV silicone rubber, liquid polysulfide rubber and liquid polyisoprene, derivatives thereof and a mixture of two or more kinds of them are used. A highly reliable mirror surface blanket utilizable in various fields can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mirrored blanket and a method for manufacturing the same, and more specifically, to patterning of high-precision IC substrates.

This product is related to mirror blankets used to transfer minute patterns onto glass plates, films, metal plates, etc. using printing methods, such as flexible substrates, photomasks, shadow masks, lead masks, LCD printing, and color filters for LCD TVs. be.

[Prior Art and Problems] As is well known, a special proofing machine type machine is usually used to print on glass plates. In addition, as plate making, resin letterpress, PS
You can choose from flat plate, waterless planographic gravure concave plate.

Currently, offset printing blankets using NBR as surface rubber based on conventional technology are used as blankets. The surface roughness of these blankets is R
Blankets with a z (10-point average roughness) of 5 to 8 μm are often used, and some blankets are specially polished for fine pattern printing. However, 2μ at Rz
The limit is about m, and it is not possible to produce products with medium reproducibility.

In surface finishing by polishing, fine lines of 100 μm level are broken or thinned when printing fine patterns, resulting in defective products.

In addition, non-abrasive blankets are dusted with talc, starch, calcium carbonate, etc. during molding, which creates pinholes and breaks the thin wires.

Furthermore, conventional surface rubbers contain sulfur, zinc white, titanium white,
Silica powder and the like are mixed in, and these poorly dispersed substances often fall off and cause pinholes. The occurrence of minute pinholes causes thin line breaks in the image, causing current to no longer flow, or the masking effect to disappear, causing light to leak.

A method of curing an unvulcanized rubber layer and film together is proposed in Japanese Patent Application Laid-Open No. 83-17093, but basically the surface layer that does not have a rubber layer mixed with a filler is difficult to cure. Generates a hole. Furthermore, this proposal uses a film having a roughness of 2 μm or more, which does not provide a mirror surface, which can be achieved by a polishing method, and is not suitable for fine patterns.

The method of applying urethane resin to the surface is disclosed in Japanese Patent Application Laid-Open No. 56-75.
Although proposed in Japanese Patent No. 896, this method involves mixing resin with AI powder, and is not suitable for these fine patterns for the above-mentioned reasons.

In addition, it is also possible to coat the surface with a liposensitive polymer.
Although proposed in Japanese Patent No. 144196, these require a drying process after being coated using a roll tool or other method. Here, hot air is often used for drying, and it is inevitable that dust of about 20 μm is attached to the surface, making it unsuitable for forming fine patterns. In addition, basically having a coating process using a knife or a roll may cause scratches on the knife or roll to be reproduced, overall unevenness may occur, or foreign matter in the coated material may cause long streaks on the coated surface, resulting in defects. Become.

The present invention was made in view of the above circumstances, and maintains the compressibility, strength, and thickness accuracy of conventional blankets.
The object of the present invention is to provide a mirror-finished blanket capable of maintaining the reproducibility of fine lines on the 10 μm level by making the surface mirror-finished, and a method for manufacturing the same.

[Means and effects for solving the problem] The invention of Section 1 of the present application provides a specular fine pattern transition layer on the top layer of the surface in a mirror blanket used for offset printing, and powder filling is used as the material for the transition layer. This mirror blanket is characterized by using a liquid room temperature curing resin or rubber that does not contain any additives.

The invention of Section 2 of the present application involves a step of laminating a blanket for offset printing and a resin film having a mirror surface with a surface roughness RzO of 5 μm or less using a room temperature curing resin or rubber under strong pressure by a calendar method, and curing them. The method for producing a mirror-surfaced blanket is characterized by comprising the step of: thereafter, peeling off the mirror-surface film to obtain a mirror surface.

The present invention improves the compressibility of conventional blankets.

10 by maintaining strength and thickness accuracy and making the surface mirror-like.
It maintains the reproducibility of fine lines on the μm level.

FIG. 1 is an example of a cross-sectional view of a mirrored blanket according to the present invention. 1 in the figure is an offset printing blanket, which includes a plurality of reinforcing cloths 2a and 2b.

2c, 2d, a sponge layer 3, a surface rubber layer 4, and an adhesive layer 5 are laminated as appropriate. Said blanket 1
A finely patterned ink transfer layer 6 is formed thereon.

Here, it is essential that the elastomer forming the transition layer 6 is a liquid resin or rubber that does not contain a filler in order to prevent pinholes caused by the filler falling off. Further, in order to prevent the adhesion of dust, it is desirable to minimize the number of steps, and although it is possible to manufacture a thermosetting type, a room temperature curing type is preferable.

Materials that meet the above requirements include solvent-free epoxy resin, RTV silicone rubber, liquid polysulfide rubber,
Polybutadiene rubber, liquid carboxylated NBR, epoxy-urethane copolymer.

Epoxy-silicon copolymer, liquid chloroprene rubber,
Single liquid polyisoprene rubbers, derivatives thereof, and mixtures of two or more types can be used.

FIG. 2 is an explanatory diagram showing a method for manufacturing a blanket according to the present invention. 11 in the figure is a base blanket, 12
a and 12b are metal rolls, 13 is a blanket film take-up roll, 14 is a mirror-finished resin film (polyester), and 15 is a transition layer material. The method for manufacturing the blanket will be described below.

First, the base blanket 11 and the mirror resin film 14
and are pressed together with two metal rolls 12a and 12b, and the above-mentioned elastomer is used as the transition layer material 5.

Here, the thickness of the transition layer material 15 is obtained by adjusting the distance between the two metal rolls 12a and 12b, and is determined by JI
10~ for elastomer with SA altitude of 30~80 degrees
A thickness of about 20 μm is desirable. Additionally, since there is no drying process, the elastomer must be solvent-free. Furthermore, the solvent type does not prevent the formation of pinholes due to the solvent.

The greatest advantage of the above manufacturing method is that by bonding the blanket and film together with the elastomer and immediately winding them up, a mirror surface can be formed without giving any chance for dust or foreign matter to get mixed in.

As a countermeasure against air bubbles in the laminating agent bank, in laminating machines that use a metal roll-rubber roll system, these air bubbles are also dragged in during lamination, so it is necessary to remove air bubbles while laminating. In order to achieve this, a linear pressure of 100 kg/am or more is required, although it depends on the viscosity of the material for the transition layer used, and a single calender system consisting of a metal roll-metal roll system is effective. The film thickness of the material for the transition layer depends on viscosity, speed, and pressure, but it has been found that it is easy to control if the pressure is 100 kg/cm or more.

Applying such strong pressure can increase the density of the layer forming the mirror surface and ensure quality stability. This method is much superior to solvent-type coating agents, knife coater, roll coater-1, and other coating methods in terms of density.

In the present invention, the resin film is usually polyester having a mirror surface with a surface roughness (Rz) of 0.5 μm or less;
Polyethylene film is used.

FIG. 3 is a diagram illustrating the principle of a calibration machine used in Examples 1-4, which will be described later. 7 in the figure is a glass plate or resin plate,
8 is a 5-plate or flat plate or an intaglio plate, 9 is an inking device, and IO is a blanket cylinder.

Examples of the present invention will be described below.

[Example 1] In FIG. 2, as the base blanket 11, an offset printing blanket (trade name: 57000, manufactured by Kinyosha Co., Ltd.) having a thickness of 1.9 mm and a surface roughness Rz of 4 μm was used. In addition, 100 parts by weight of the soft epoxy resin (trade name: Aradite AW10B (manufactured by Nippon Ciba Gaiki), 80 parts by weight of the trade name No-Donor HV953 U (manufactured by Nippon Ciba Gaiki), and D B as a viscosity modifier.
A solution containing 80 parts by weight of P was prepared. Furthermore, as the polyester film 14, trade name: Lumirror 0.188a+m
(Made by Toshi) Surface roughness RzOJμm.

Lamination was carried out using R,..., 1,2 μm.

After being left to cure at room temperature for one week, the film was peeled off to obtain a mirror-like blanket. As a result, the ink transfer layer was 10 μm and the roughness Rz was 0.7 μm.

When this was applied to a proofing machine and used for printing fine patterns on glass, a group of fine lines with a line width of 80 μm was precisely reproduced. However, since the resin is hard, care had to be taken when handling the blanket to avoid wrinkles.

In this way, according to the first embodiment, by providing the mirror-like fine pattern ink dislocation layer in the uppermost layer, the compressibility, strength, and thickness accuracy of the conventional blanket are maintained.
It was possible to obtain a mirror-like blanket that could maintain the reproducibility of fine lines at the 30 μm level.

[Example 2] First, the above printing blanket (product name: 87000)
On the surface of the 1.9m-
The liquid was applied to the surface using a roll coater method. After drying, epoxy-urethane copolymerization (trade name FEX 14)
13, manufactured by Yokohama Rubber) 100 parts by weight, curing agent 1.38A
A weight part of C5 was placed in a bank position and wound together with a mirror-finished polyester film.

After leaving it for one week, the film was peeled off to obtain a mirror-like blanket. As a result, the ink transfer layer was 20 μm, and the surface roughness Rz was 1.2 μm. It is a highly flexible blanket, and when it was used to create a fine pattern on glass, it was able to faithfully reproduce a pattern with a line width of 50 μm. In particular, it was confirmed that there were no jagged edges at all and that sharp edges could be printed.

[Example 3] Blanket (trade name: S-1100, manufactured by Kinyosha) thickness 1.9 ■ Epoxy-silicon copolymer (trade name: ESNOX-IA, manufactured by ThreeBond) as a bonding agent between blanket and mirror-polished polyester ), the same operation as in Example 1 was carried out, the film was peeled off after being left for one week, and a mirror-like blanket was obtained. As a result, the thickness of the ink transfer layer was 25 μm, and the surface roughness Rz was 13 μm. When this was subjected to fine pattern printing using UV ink, a fine line of 40 μm could be reproduced.

[Example 4] The same base blanket as in Example 3 was used, and the material for the transition layer was trade name: room temperature curing type K E 4.
Using 5RT V silicone (Shin-Etsu Chemical) and a commercially available mirror polyethylene film as the mirror film, one roll of lamination was carried out using the method shown in Figure 2, left for two weeks, and the film was peeled off to determine the roughness Rz O, 4 μm, R, 11, 11,
A mirror-like blanket of 4 μm was obtained.

As a result, the thickness of the ink transfer layer was 50 μm due to the high viscosity of the material for the transfer layer, but the surface roughness Rzl was 1 μm.
Obtained a mirror surface. When this was subjected to fine pattern printing using UV ink, a fine line of 50 μm could be reproduced.

[Example 5] Pinhole-less pattern printing includes solid printing on liquid crystal glass. This involves engraving the required pattern using a letterpress rubber plate, then dissolving liquid crystal polymer in a solvent, applying it thinly and uniformly to the plate, and transferring it to glass. At this time as well, poorly dispersed substances such as zinc white, titanium white, and silica kneaded into the rubber plate fall off and form pinholes. In this case, since the glass is cut and used, the defective part of the glass can be thrown away. However, the yield is only about 70%, and production efficiency is extremely low considering the labor-intensive work.

EFT rubber hardness 6o polyester film
．． 181! - A rubber sheet with a thickness of 2.4 mm was obtained by adhering the rubber sheet to a rubber sheet by hot pressing and polishing the surface. Using the same epoxy-silicon copolymer as in Example 3 using the method shown in Figure 12, a mirror-finished polyethylene film 0,2
It was attached to the intestinal layer. This was left to stand for one week, the film was peeled off, and the engraving was performed and transferred to glass to obtain an extremely uniform coating surface.

C. Effects of the Invention] As detailed above, according to the present invention, the reproducibility of fine lines at the 10 μm level can be maintained by making the surface mirror-finished while maintaining the compressibility, strength, and thickness accuracy of conventional blankets. It is possible to provide a highly reliable mirrored blanket that can be used in a variety of fields, and a method for manufacturing the same.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the mirrored blanket according to the present invention, and FIG.
The figure is an explanatory diagram of a calendar pasting machine according to the present invention, and FIG. 3 is an explanatory diagram of a printing press according to the present invention. 1...Blanket for offset printing, 28-2d.
... Reinforcement cloth, 3... Sponge layer, 4... Surface rubber layer, 5... Adhesive layer, 6... Fine pattern ink transfer layer, 7... Glass plate, 8... Letterpress or Flat plate or concave plate, 9... Inking device, 10... Blanket cylinder,
ll... Base blanket, 12... Calendar nip device, 13... Winding device, 14... Mirror finished resin film. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] 1. In a mirror blanket used for offset printing, a mirror fine pattern transition layer is provided on the uppermost layer of the surface, and the transition layer is made of a liquid room temperature curing resin containing no powder filler or A mirror blanket characterized by the use of rubber. 2. The liquid room temperature curing resin is an epoxy resin. RTV silicone rubber, RTV urethane rubber, liquid polysulfide rubber, polybutadiene rubber, liquid carboxylated NBR, epoxy-urethane copolymer, epoxy-
2. The specular blanket according to claim 1, which is a single substance of silicone copolymer, liquid chloroprene rubber, liquid polyisoprene rubber, or a mixture of two or more thereof. 3. Offset printing blanket and surface roughness of 0.5μ
The method comprises the steps of: laminating a resin film with a mirror surface of 1.0 m or less with room temperature curing resin or rubber under strong pressure by a calendar method; and after curing these, peeling off the mirror film to obtain a mirror surface. A method for manufacturing a mirrored blanket characterized by: