KR101557081B1 - Printing Rubber Blanket and Method for Manufacturing the Same - Google Patents

Abstract

A rubber blanket used for printing a thin line pattern on a substrate, wherein a liquid rubber is poured onto a surface of a substrate having an arithmetic mean roughness in a range of 0.1 x Ra to 3 x Ra relative to an arithmetic average roughness (Ra) And then the adhesive is applied to the surface of the cured rubber to form an adhesive layer, the base material of the rubber blanket is bonded to the adhesive layer, the rubber blanket is peeled off from the base material after the surface rubber layer is cured, Blanket.

Printing rubber blanket, arithmetic average roughness, fine line patterning, pinhole,

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rubber blanket for printing,

The present invention relates to a rubber blanket for printing. More particularly, the present invention relates to a rubber blanket for use in printing a fine line pattern such as a color filter (hereinafter referred to as CF) pattern for a liquid crystal display (hereinafter referred to as an LCD) or an electrode pattern for a plasma display panel will be.

In recent years, it has been actively studied to perform fine line patterning using an offset printing method. For example, printing of an LCD CF pattern on a glass substrate using an offset printing method, printing of PDP electrode patterns, printing various circuit patterns on various plastic films, and the like have been actively studied.

In this field, the printing method is being studied because it simplifies the process and does not require a large facility, which is advantageous in terms of cost. However, in the thin line patterning by this printing method, the characteristics such as the shape of the fine lines should not be lower than the conventional method. In addition, low cost is required for thin line patterning by this printing method.

Offset printing is a printing method in which a rubber blanket is used for pattern transfer to a final substrate. The rubber blanket is formed by arranging an organic rubber material as a surface rubber on a base material composed of a composite of a base cloth and rubber and polishing the surface of the base rubber. The printing of this method has been widely used for newspaper printing or commercial printing. However, in the conventional rubber blanket for thin line patterning, the surface thereof is rough and the ink transfer rate is poor, so that many applications are difficult to apply. Therefore, in order to improve this, the surface modification of the rubber blanket or the material constituting the rubber blanket have been developed.

In order to satisfactorily perform fine line patterning using a rubber blanket, it is necessary to use a rubber blanket having a surface roughness that is as close as possible to the surface roughness of the substrate to be printed. As the surface rubber, silicone rubber is particularly preferable because it is excellent in releasability, and the ink transfer rate can be significantly increased as compared with other organic rubbers.

The surface roughness of the rubber blanket is very important when conducting the fine line pattern. When the surface roughness of the rubber blanket is large, the caulking line is disturbed, and furthermore, the adhesion between the rubber blanket and the ink material is strengthened, resulting in a problem that pinholes are generated.

Generally, up to this point, it has been believed that in the fine line patterning, the surface roughness of the rubber blanket is preferably as small as possible within the processing range. However, it is technically difficult to control the surface roughness of the rubber blanket to be small. When the surface roughness is made small, various other members required for manufacturing the rubber blanket are expensive, and the manufacturing process becomes complicated. .

In addition, when the surface roughness of the rubber blanket is too small, adhesion between the printing plate or the printing substrate and the rubber blanket becomes strong depending on the printing conditions, and conversely, the transfer rate may be lowered or the printing quality may be deteriorated.

Various proposals have been made so far regarding the surface roughness of the rubber blanket used for fine line patterning and the manufacturing method thereof. For example, it has been proposed to use a rubber blanket having a surface rubber having an arithmetic average roughness (Ra) of 0.1 nm or more and less than 20 nm and a 10-point average roughness (Rz) of 0.1 nm or more and less than 100 nm for printing on a PDP electrode substrate Japanese Patent Application Laid-Open No. 2005-190969). It is also believed that a rubber blanket having a surface rubber layer having a ten-point average roughness (Rz) of 2 탆 or less and an arithmetic mean roughness (Ra) of 0.2 nm or less is considered to be preferable for printing a polymer electroluminescence material (JP-A 2005 -310411). A method for manufacturing a rubber blanket in which a base material and a smoothing member are arranged in parallel in a mold, and a rubber raw material is injected into the mold and the rubber material is cured to peel off the smooth portion to mold the surface rubber (Japanese Patent Laid- report). A method for manufacturing a rubber blanket in which a base material is brought into close contact with an object to be water-tested, a liquid rubber raw material is poured on the base material, self-leveling is performed, Japanese Patent Application Laid-Open No. 2003-136856).

However, since the Japanese Unexamined Patent Application Publication Nos. 2005-190969 and 2005-310411 merely restrict the surface smoothness, the smoothness may be more required depending on the state of the substrate to be printed, Surface smoothness was not sufficient in some cases. Further, Japanese Patent Application Laid-Open No. H8-112981 has a problem in terms of working efficiency, such as careful attention is required to prevent contamination and scratches on the film surface. In addition, Japanese Patent Application Laid-Open No. 2003-136856 fails to produce a rubber blanket having a surface property related to the surface property of the substrate even when the surface property related to the smoothness of the substrate surface is obtained.

An object of the present invention is to provide a rubber blanket having a surface property best suited to its surface property regardless of the surface properties of the substrate, and is characterized in that the arithmetic average roughness of the surface rubber of the rubber blanket is about an arithmetic average roughness And an arithmetic average roughness of 0.05 x Ra to 4.5 x Ra. That is, the arithmetic average roughness of the surface rubber of the rubber blanket is set in the range of 0.05 × Ra to 4.5 × Ra of the value based on the arithmetic mean roughness (Ra) of the surface of the substrate. A method of producing such a printing rubber blanket includes preparing a substrate (frame) having an arithmetic mean roughness in the range of 0.1 x Ra to 3 x Ra with respect to the arithmetic mean roughness (Ra) of the substrate, The rubber is poured, and then it is hardened as it is. Then, an adhesive is applied to the cured rubber surface to form an adhesive layer, and the substrate of the rubber blanket is stuck on the adhesive layer. After the surface rubber layer is cured, the rubber blanket is peeled off from the substrate (frame) to produce a rubber blanket for printing.

The rubber blanket of the present invention is a printing rubber blanket having an arithmetic mean roughness of 0.05 x Ra to 4.5 x Ra relative to the arithmetic average roughness (Ra) of the surface of the substrate. The inventors have studied the surface roughness of a rubber blanket that is optimal for use in a fine line pattern and have found that the surface roughness of the rubber blanket can be optimized by making a determination with respect to the substrate. Further, it has been found that a printed matter of excellent fine line shape is printed by using the rubber blanket. The surface roughness of the rubber blanket at that time is not limited to the same as the surface roughness of the substrate to be printed, and the surface roughness of the rubber blanket at the time has an arithmetic mean roughness (Ra) in the range of 0.05 x Ra to 4.5 x Ra relative to the arithmetic mean roughness It has been found that it is preferable to use a rubber blanket.

When the surface arithmetic mean roughness (Ra) of the substrate to be printed is less than 0.05 x Ra, a transfer failure (partial irregularity) may be called depending on printing conditions. Further, when a rubber blanket having a large arithmetic mean roughness exceeding a value of 4.5 x Ra is used for the arithmetic mean roughness (Ra) of the surface of the substrate to be printed, the surface roughness of the surface rubber is increased. In addition, it has been found that the adhesion between the ink and the rubber blanket becomes strong, which may cause defects such as pinholes. As a result of many experiments by the inventors, when the rubber blanket having the arithmetic mean roughness of 0.05 x Ra to 4.5 x Ra is used for the arithmetic average roughness (Ra) of the surface of the substrate to be printed, And it is possible to eliminate defects such as pinholes and the like.

As a manufacturing method of the blanket for obtaining the surface roughness, a member (frame) having an arithmetic mean roughness of 0.1 x Ra to 3 x Ra relative to the arithmetic mean roughness (Ra) of the substrate is applied to a material Is brought into contact with the surface of the rubber blanket, and then the surface rubber is molded by peeling it, it is clear that the arithmetic average roughness of the rubber blanket is 0.05 x Ra to 4.5 x Ra.

It is preferable to use a member (frame) having an arithmetic mean roughness of 0.1 x Ra to 3 x Ra relative to the arithmetic average roughness (Ra) of the surface of the substrate, particularly for the rubber blanket and the member for producing a rubber blanket . More preferably, it is a member (frame) having an arithmetic mean roughness of a value of 0.2 x Ra to 2 x Ra.

The method of transferring the surface roughness of the substrate to the surface rubber of the rubber blanket is preferably a step of transferring a member having surface roughness of 0.1 x Ra to 3 x Ra to the arithmetic mean roughness R (a) A rubber blank material in which a surface shape is transferred by adhering a blanket base material to a surface of a blanket material by coating the surface of the blanket material horizontally, coating a liquid rubber raw material thereon by various methods and curing it, Is effective. In addition to this, the blanket substrate and the substrate (frame) may be arranged in parallel in the mold, and the liquid rubber raw material may be injected between the blanket substrate and the frame to be cured and removed from the frame. It is preferable that the former method employs a number evaluation zone without using a mold in that the substrate can be produced regardless of the kind of the substrate (frame).

Since the rubber blanket obtained by the present invention is related to the surface property of the substrate to be printed, the surface properties of the rubber blanket are excellent, and at the same time, it can be produced inexpensively and easily. In addition, by using this rubber blanket, it is possible to print fine fine line patterns on the substrate with extremely high accuracy without disturbing the lines. In addition, a printed material free of pinholes can be obtained. As a result, even when used in a color filter for a liquid crystal display, the color is not stained. In addition, since there is no pinhole, light can be prevented from leaking. In addition, according to this method, the size of the substrate (frame) can be easily achieved.

Fig. 1 is a rubber blanket which is one example of the present invention, and comprises a surface rubber 11 and a base material 12 as a lower layer. The base material 12 is composed of a polyethylene terephthalate film 121 (hereinafter referred to as a PET film) immediately below the surface rubber 11, a compression layer 122 and a polyester fiber 123 as a lower layer below the compression layer 122. The base material may be a known fabric such as cotton, polyester fiber or nylon fiber, or various plastic films such as a PET film, a polyethylene naphthalate film (hereinafter referred to as PEN), a polyimide film, And the like. Preferably, a compressed layer containing independent or open cells is disposed in the layer of the substrate portion. By introducing this compressed layer into the substrate, it is possible to prevent the occurrence of bulging (bulging) at the time of printing, and to improve the dimensional accuracy of the printed matter.

Existing rubber raw materials such as acrylonitrile-butadiene rubber, ethylene propylene rubber, natural rubber, and silicone rubber can be used as the surface rubber layer. Among them, silicon rubber has excellent ink transfer rate on the rubber surface. The silicone rubber is preferably a liquid raw material which is easy to transcribe the surface shape of the substrate (frame) to be printed.

The thickness of the surface rubber layer is preferably 0.1 to 1 mm, and more preferably 0.3 to 0.8 mm. When the thickness of the surface rubber layer is thinner than 0.1 mm, the influence of the lower layer substrate is reflected in the surface rubber, which causes a problem in the flatness of the surface. When the thickness of the surface rubber is larger than 1 mm, the volume change of the surface rubber layer due to the swelling of the solvent on the surface rubber layer when using the rubber blanket is increased, resulting in a problem that the printing precision is weakened.

The material of the substrate to be printed is not particularly limited, but the glass substrate is used for CF of LCD or electrode of PDP, and is most widely studied as a substrate for thin line patterning. Various plastic films have also been subjected to circuit patterning. In addition to conventional films such as PET films, PEN films, and polyimide films, acrylic resins or polyester resins are coated on these plastic films to smooth the surface Or the ink adhesion is increased.

As the frame used in producing the rubber blanket, the substrate itself is preferable, but a substrate having the same surface roughness as that of the substrate can be applied, even if the substrate itself is not used. When these slabs are used in the production of rubber blanket, it is preferable to carry out mold release treatment to increase the number of times of use. As a material used in the mold releasing treatment, a fluorine-containing material, a material which is a liquid raw material of a silicon-containing material, or the like is used and is uniformly coated on the frame by a method such as dipping, wiping, spraying and the like. By using this frame to form the surface rubber of the rubber blanket as described above, it is possible to manufacture a rubber blanket having a surface roughness easily required at a low cost at a low cost.

Figure 2 is a rubber blanket according to another embodiment of the present invention. In Fig. 2, reference numeral 21 denotes a surface rubber TSE3453T (product of Mandom Performance Materials Japan Ltd., two-component silicone rubber), and the thickness thereof is 0.4 mm. The base material 22 is obtained by adhering a 0.1 mm PET film S-10 (manufactured by Toray Industries, Inc.) 221 with an adhesive to a flexible polyurethane foam 222 of 0.5 mm.

Fig. 3 is a schematic explanatory view of the main part of the printing plate inverting printing press using this blanket. As shown in FIG. 3A, the rubber blanket 31 is mounted around the blanket cylinder 32. The ink supplied from the ink tank 36 is directly supplied onto the rubber blanket 31 at the slit die 33. [ On the rubber blanket 31, a beta film of ink is formed. After removing the ink on the non-image portion by the printing plate 34, necessary caustic patterns remaining on the rubber blanket 31 are transferred to the printing body 35.

(Example 1)

The substrate used was a glass substrate of CF grade for LCD. The arithmetic mean roughness (Ra) of this glass substrate was 0.5 nm. The glass substrate was brought into close contact with the object to be evaluated, and a surface rubber raw material (liquid silicone rubber) was poured thereon and cured in the environment of a temperature of 23 캜 and a humidity of 50% for 24 hours. The adhesive was applied to the cured rubber, and the substrate of the rubber blanket was stuck thereon. After the rubber was cured, the rubber was stripped from the glass substrate to obtain a rubber blanket having a rubber layer on the surface. The arithmetic mean roughness (Ra) of the rubber blanket was 0.5 nm. Using this rubber blanket, a predetermined caulk was printed on the glass substrate. A silver paste was used for the ink, and a stripe pattern having a line width of 25 mu m as a linewidth pattern was used to determine whether the printed line had good or bad shape. In addition, the presence or absence of pinhole defects in the caustic was investigated. As a result, a good line shape was obtained, and pinholes were not generated.

(Example 2)

The substrate used was a glass substrate of CF grade for LCD. The arithmetic mean roughness (Ra) of the glass substrate was 0.5 nm. On the other hand, a PET film having an improved smoothness was prepared by coating an acrylic resin on the surface. The arithmetic mean roughness (Ra) of this PET film was 1.4 nm.

In the same manner as in Example 1, the PET film was brought into close contact with a water evaluation table, and a rubber raw material on the surface of the rubber blanket was poured thereon. And the rubber blanket base was stuck thereon. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket having a rubber layer on the surface. The arithmetic mean roughness (Ra) of the rubber blanket was 2.0 nm. Using the rubber blanket, a predetermined line was printed on the above-described glass substrate in the same manner as in Example 1. As a result, a good line shape was obtained and pinholes were not generated.

(Example 3)

A polyimide film was used for the substrate. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. On the other hand, a glass substrate of a CF grade for LCD was prepared as a mold for molding a blanket. The arithmetic mean roughness (Ra) of this glass substrate was 0.5 nm. The glass substrate was placed in a predetermined mold in parallel with the blanket substrate, and the surface rubber raw material was injected between the substrate and the glass substrate. After injecting the surface rubber raw material, the mold was cured in a heating furnace at 80 DEG C for 3 hours. After the rubber was cured, the glass substrate integrated with the substrate was taken out from the mold and the glass substrate was peeled off from the substrate to obtain a rubber blanket for printing. The arithmetic mean roughness (Ra) of the rubber blanket was 0.3 nm. Using the rubber blanket, a predetermined line was printed on the above polyimide film in the same manner as in Example 1, whereby a good line shape was obtained and pinholes were not generated.

(Example 4)

A polyimide film was used for the substrate. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. On the other hand, in order to improve the surface smoothness, a PET film coated with a polyester resin was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 1.6 nm. The same procedure as in Example 1 was followed to adhere the PET film to the object to be evaluated, to pour the rubber raw material on the surface of the rubber blanket, to bond the base material of the rubber blanket thereto, to peel off the PET film after the rubber was cured, A blanket was obtained. The arithmetic average roughness (Ra) of the rubber blanket was 0.9 nm. Using this rubber blanket, a predetermined line was printed on the polyimide film in the same manner as in Example 1. As a result, good linearity was obtained and no pinhole occurred.

(Example 5)

A polyimide film was used for the substrate. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. The polyimide film was brought into close contact with the object to be evaluated, a rubber raw material on the surface of the rubber blanket was poured thereon, the adhesive was applied after the rubber was cured, and the substrate was stuck. After the rubber was cured, the polyimide film was peeled off to obtain a rubber blanket for printing. The arithmetic mean roughness (Ra) of the rubber blanket was 6.5 nm. Using the rubber blanket, predetermined virgin wire was printed on the polyimide film in the same manner as in Example 1. As a result, a good wire shape was obtained and pinholes were not generated.

(Example 6)

A polyimide film was used for the substrate. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. On the other hand, ultra-high transparent grade PET film was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 13.8 nm. In the same manner as in Example 1, the PET film was brought into close contact with the object to be evaluated, a rubber material on the surface of the rubber blanket was poured thereon, the rubber blanket base material was stuck thereon, the PET film was peeled off after the rubber was cured, A rubber blanket was obtained. The arithmetic mean roughness (Ra) of the rubber blanket was 20.4 nm. Using the rubber blanket, predetermined virgin wire was printed on the polyimide film in the same manner as in Example 1. As a result, a good wire shape was obtained and pinholes were not generated.

(Example 7)

As the substrate to be printed, an ultra-high transparent PET film was used. The arithmetic mean roughness (Ra) of the PET film of this ultrahigh transparent grade was 13.8 nm. On the other hand, a PET film having a surface coated with an acrylic resin was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 1.4 nm. In the same manner as in Example 1, the latter acrylic resin-coated PET film was brought into close contact with the water evaluation object, and the rubber material on the surface of the rubber blanket was poured thereon, and the rubber was cured while being adhered to the PET film. After the rubber was cured, the adhesive was applied, the substrate of the blanket was stuck, and the acrylic resin-coated PET film was peeled off to obtain a rubber blanket. The arithmetic mean roughness (Ra) of the rubber blanket was 0.7 nm. Using this rubber blanket, a predetermined caulk line was printed on the PET film of ultra-high transparent grade in the same manner as in Example 1. As a result, a good caulk profile was obtained and pinholes were not generated.

(Example 8)

As the substrate to be printed, an ultra-high transparent PET film was used. The arithmetic mean roughness (Ra) of the PET film of this ultrahigh transparent grade was 13.8 nm. On the other hand, a PET film of high transparency grade was prepared as a frame. The arithmetic mean roughness (Ra) of the latter high-transparency grade PET film was 15.2 nm. The PET film was placed in parallel with the blanket substrate in the same manner as in Example 3, and the raw material of the blanket surface rubber was injected between the base material and the PET film. After the rubber was cured, the PET film was taken out from the mold, ≪ / RTI > The arithmetic average roughness (Ra) of the rubber blanket was 9.1 nm. Using this rubber blanket, a predetermined caulk line was printed on the PET film of ultra-high transparent grade in the same manner as in Example 1. As a result, a good caulk profile was obtained and pinholes were not generated.

(Example 9)

As the substrate to be printed, an ultra-high transparent PET film was used. The arithmetic mean roughness (Ra) of the PET film of this ultrahigh transparent grade was 13.8 nm. On the other hand, a transparent grade PET film was prepared as a frame. The latter arithmetic mean roughness (Ra) of the PET film was 40.8 nm. This PET film was placed in parallel with the blanket base material in the mold in the same manner as in Example 3, and the raw material of the blanket surface rubber was injected between the base material and the PET film. After the rubber was cured, it was taken out from the mold, and the PET film was peeled off to obtain a rubber blanket. The arithmetic average roughness (Ra) of the rubber blanket was 60.9 nm. Using this rubber blanket, a predetermined caulk line was printed on a PET film having an ultra-high transparent grade in the same manner as in Example 1. As a result, a good caulk profile was obtained and pinholes were not generated.

(Example 10)

A PET film of high transparency grade was used as the substrate. The arithmetic mean roughness (Ra) of this high transparency grade PET film was 15.2 nm. On the other hand, a PET film having a surface coated with a polyester resin was prepared as a frame. The latter polyester resin-coated PET film had an arithmetic mean roughness (Ra) of 1.6 nm. The PET film was placed in parallel with the blanket substrate in the same manner as in Example 3, and the raw material of the blanket surface rubber was injected between the base material and the PET film, and after curing, the PET film was taken out from the mold and the PET film was peeled off to obtain a rubber blanket . The arithmetic mean roughness (Ra) of the rubber blanket was 0.8 nm. Using this rubber blanket, a predetermined line was printed on a PET film having a high transparency grade in the same manner as in Example 1. As a result, a good line shape was obtained and pinholes were not generated.

(Example 11)

A PET film of high transparency grade was used as the substrate. The arithmetic mean roughness (Ra) of this high transparency grade PET film was 15.2 nm. On the other hand, an ultra-high transparent PET film was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 13.8 nm. The same procedure as in Example 1 was carried out except that the ultra-high transparent grade PET film was brought into close contact with the water evaluation object, the raw material of the surface rubber of the rubber blanket was poured thereon, the rubber blanket base material was stuck thereto, And peeled off to obtain a rubber blanket for printing. The arithmetic mean roughness (Ra) of the rubber blanket was 20.4 nm. Using this rubber blanket, a predetermined line was printed on the above-mentioned highly transparent grade PET film in the same manner as in Example 1. As a result, a good line shape was obtained and pinholes were not generated.

(Example 12)

A PET film of high transparency grade was used as the substrate. The arithmetic mean roughness (Ra) of this high transparency grade PET film was 15.2 nm. On the other hand, a transparent grade PET film was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 45.0 nm. The PET film was brought into close contact with the object to be evaluated in the same manner as in Example 1, the raw material of the surface rubber of the rubber blanket was injected thereon, and the rubber blanket base was stuck thereto. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket for printing. The arithmetic mean roughness (Ra) of the rubber blanket was 67.3 nm. Using this rubber blanket, a predetermined line was printed on the above-mentioned highly transparent grade PET film in the same manner as in Example 1. As a result, a good line shape was obtained and pinholes were not generated.

(Comparative Example 1)

The substrate used was a CF grade glass substrate for LCD. The average roughness (Ra) of the glass substrate was 0.5 nm. On the other hand, a PET film having a surface coated with a polyester resin was prepared. The arithmetic mean roughness (Ra) of this PET film was 1.6 nm. This PET film was brought into close contact with the water evaluation table, and the rubber raw material on the surface of the rubber blanket was poured thereon. And the rubber blanket base was stuck thereon. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket having a rubber layer on the surface. The arithmetic average roughness (Ra) of the rubber blanket was 2.4 nm. A predetermined caulk line was printed on the glass substrate by using the rubber blanket. As a result, it was confirmed that the caustic line was totally disturbed, and the occurrence of some pinholes was also confirmed.

(Comparative Example 2)

The substrate to be printed was a PET film coated with an acrylic resin. The arithmetic mean roughness (Ra) of this PET film was 1.4 nm. On the other hand, a polyimide film was prepared as a frame. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. In the same manner as in Example 1, the PET film was brought into close contact with a water evaluation table, a rubber raw material on the surface of the rubber blanket was poured thereon, and a rubber blanket base was stuck thereto to cure the rubber. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket having a rubber layer on the surface. The arithmetic mean roughness (Ra) of the rubber blanket was 6.5 nm. A predetermined caulk line was printed on the PET film coated with the acrylic resin by using the rubber blanket in the same manner as in Example 1. As a result, it was confirmed that the caulking wire was disturbed on the entire surface of the print. Pinholes and the like did not occur.

(Comparative Example 3)

The substrate to be printed was a PET film coated with an acrylic resin. The arithmetic mean roughness (Ra) of this PET film was 1.4 nm. On the other hand, an ultra-high transparent PET film was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 13.8 nm. In the same manner as in Example 1, the PET film of ultra-high transparent grade was brought into close contact with the water evaluation table, and the rubber material on the surface of the rubber blanket was poured thereon, and the rubber blanket base material was stuck thereto to cure the rubber. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket having a rubber layer on the surface. The arithmetic average roughness (Ra) of this rubber blanket was 10.4 nm. A predetermined caulk line was printed on the PET film coated with the acrylic resin by using the rubber blanket in the same manner as in Example 1. As a result, it was confirmed that the caulking wire was totally disturbed. Pin hole generation was also seen.

(Comparative Example 4)

A polyimide film was prepared as a substrate to be printed. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. On the other hand, a glass substrate on which the surface was precision polished was prepared as a frame. The arithmetic average roughness (Ra) of this glass substrate was 0.4 nm. The glass substrate was brought into close contact with the water evaluation table, and the rubber raw material on the surface of the rubber blanket was poured thereon. The rubber blanket substrate was stuck thereon, and after the rubber was cured, it was peeled off from the glass substrate to obtain a rubber blanket having a rubber layer on the surface. The arithmetic average roughness (Ra) of the rubber blanket was 0.2 nm. Using the rubber blanket, a predetermined caulk was printed on the polyimide film in the same manner as in Example 1. As a result, it was confirmed that pinholes were not generated but locally caulked.

(Comparative Example 5)

A polyimide film was prepared as a substrate to be printed. The arithmetic mean roughness (Ra) of the polyimide film was 4.8 nm. On the other hand, PET film of high transparency grade was prepared as a frame. The surface roughness (Ra) of this PET film was 15.2 nm. This PET film was placed in a mold in parallel with the blanket substrate in the same manner as in Example 3, and the blanket-surface rubber raw material was injected between the base and the PET film and cured. Then, the PET film was taken out from the mold and the PET film was peeled off to obtain a rubber blanket. The arithmetic mean roughness (Ra) of this rubber blanket was 22.2 nm. Using this rubber blanket, predetermined virgin wire was printed on the polyimide film in the same manner as in Example 1, and pinholes were not generated, but it was confirmed that the virgin wire was disturbed.

(Comparative Example 6)

As the substrate to be printed, an ultra-high transparent PET film was used. The arithmetic mean roughness (Ra) of the PET film of this ultrahigh transparent grade was 13.8 nm. On the other hand, a glass substrate was prepared as a frame. The arithmetic mean roughness (Ra) of the glass substrate was 0.5 nm. This glass substrate was placed in a mold in parallel with the blanket substrate in the same manner as in Example 3. The rubber raw material of the blanket surface rubber was poured between the substrate and the glass substrate and cured and taken out from the mold. The rubber blanket was peeled off. The arithmetic mean roughness (Ra) of the rubber blanket was 0.5 nm. Using this rubber blanket, a predetermined hot line was printed on the PET film of ultra-high transparent grade in the same manner as in Example 1. As a result, it was confirmed that the occurrence of pinholes was not confirmed, but the hot line partially disappeared.

(Comparative Example 7)

As the substrate to be printed, an ultra-high transparent PET film was used. The arithmetic mean roughness (Ra) of the PET film of this ultrahigh transparent grade was 13.8 nm. On the other hand, a general-purpose PP film was prepared as a frame. The arithmetic mean roughness (Ra) of the PP film was 45.0 nm. This PP film was placed in a mold in parallel with the blanket substrate in the same manner as in Example 3. The rubber raw material of the blanket surface rubber was injected between the substrate and the PP film and was taken out from the mold after curing, A blanket was obtained. The arithmetic mean roughness (Ra) of the rubber blanket was 67.3 nm. Using this rubber blanket, a predetermined caulk line was printed on the PET film of ultra-high transparent grade as in Example 1. As a result, it was confirmed that the caustic line was disturbed on the entire surface of the print, and pinholes were also observed.

(Comparative Example 8)

A PET film of high transparency grade was used as the substrate. The arithmetic mean roughness (Ra) of this PET film was 15.2 nm. On the other hand, a glass substrate was prepared as a frame. The arithmetic mean roughness (Ra) of this glass substrate was 0.5 nm. The glass substrate was brought into close contact with the object to be evaluated, the base of the rubber blanket was stuck thereon, the rubber was cured and then peeled off from the glass substrate to obtain a rubber blanket having a rubber layer on the surface. The arithmetic mean roughness (Ra) of the rubber blanket was 0.5 nm. Using this rubber blanket, a predetermined hot line was printed on the above-mentioned highly transparent grade PET film in the same manner as in Example 1. As a result, it was confirmed that the caustic line as a whole was disturbed, but the occurrence of pinholes was not confirmed.

(Comparative Example 9)

A PET film having a high transparency grade was prepared as a printing substrate. The arithmetic mean roughness (Ra) of this PET film was 15.2 nm. On the other hand, a PET film coated on the surface of acrylic resin was prepared as a frame. The arithmetic mean roughness (Ra) of this PET film was 1.4 nm. The PET film was placed in parallel with the blanket substrate in the same manner as in Example 3, and the raw material of the blanket surface rubber was injected between the substrate and the PET film, and after curing, the PET film was taken out from the mold and the PET film was peeled off, . The arithmetic mean roughness (Ra) of the rubber blanket was 0.7 nm. Using this blanket, a predetermined caulk line was printed on the above-mentioned highly transparent grade PET film in the same manner as in Example 1. As a result, it was confirmed that pinholes were not generated but locally caulked lines were disturbed.

(Comparative Example 10)

A PET film having a high transparency grade was prepared as a printing substrate. The arithmetic mean roughness (Ra) of this PET film was 15.2 nm. On the other hand, a semi-transparent grade PET film was prepared as a frame. The arithmetic mean roughness (Ra) of this translucent PET film was 48.0 nm. The PET film was brought into close contact with the water evaluation subject, and the rubber raw material on the surface of the rubber blanket was poured thereon. The substrate of the rubber blanket was stuck thereon, and after the rubber was cured, it was peeled off from the PET film to obtain a rubber blanket having a rubber layer on the surface. The arithmetic average roughness (Ra) of the rubber blanket was 69.6 nm. Using this blanket, a predetermined hot line was printed on the above-mentioned highly transparent grade PET film in the same manner as in Example 1. As a result, it was confirmed that the entire hot line was disturbed and the occurrence of pinholes locally. The results of these Examples and Comparative Examples are shown in Table 1.

Arithmetic mean roughness of surface (nm) Ra value multiplication by printed body Line width (탆) Caustic judgment
Pinhole
The printed body Substrate (frame) Blanket Substrate (frame) Blanket Minimum value Maximum value Maximum-minimum value Example 1 0.5 0.5 0.5 1.00 1.00 24.2 25.3 1.1 Good none Example 2 0.5 1.4 2.0 2.80 4.00 24.2 25.8 1.6 Good none Example 3 4.8 0.5 0.3 0.10 0.06 23.9 25.4 1.5 Good none Example 4 4.8 1.6 0.9 0.33 0.19 23.8 25.9 2.1 Good none Example 5 4.8 4.8 6.5 1.00 1.35 24.5 25.1 0.6 Good none Example 6 4.8 13.8 20.4 2.88 4.25 24.0 26.2 2.2 Good none Example 7 13.8 1.4 0.7 0.10 0.05 23.9 25.8 1.9 Good none Example 8 13.8 15.2 9.1 1.10 0.66 23.6 25.8 2.2 Good none Example 9 13.8 40.8 60.9 2.96 4.41 23.9 25.9 2.0 Good none Example 10 15.2 1.6 0.8 0.11 0.05 23.7 25.2 1.5 Good none Example 11 15.2 13.8 20.4 0.91 1.34 24.2 25.8 1.6 Good none Example 12 15.2 45.0 67.3 2.96 4.43 24.0 26.0 2.0 Good none Comparative Example 1 0.5 1.6 2.4 3.20 4.48 23.7 26.9 3.2 Bad has exist Comparative Example 2 1.4 4.8 6.5 3.43 4.64 23.1 26.6 3.5 Bad none Comparative Example 3 1.4 13.8 10.4 9.86 7.43 22.6 27.0 4.4 Bad has exist Comparative Example 4 4.8 0.4 0.2 0.08 0.04 23.3 26.9 3.6 Bad none Comparative Example 5 4.8 15.2 22.2 3.17 4.63 23.2 26.9 3.7 Bad none Comparative Example 6 13.8 0.5 0.5 0.04 0.04 24.0 28.0 4.0 Bad none Comparative Example 7 13.8 45.0 67.3 3.26 4.88 22.2 27.0 4.8 Bad has exist Comparative Example 8 15.2 0.5 0.5 0.03 0.03 22.1 27.0 4.9 Bad none Comparative Example 9 15.2 1.4 0.7 0.09 0.05 23.4 27.2 3.8 Bad none Comparative Example 10 15.2 48.0 69.6 3.16 4.58 23.0 28.0 5.0 Bad has exist

The line widths of the line patterns of Examples and Comparative Examples shown in Table 1 are based on 23.5 to 26.5 mu m and it is preferable that the difference between the maximum value and the minimum value of the line width is 3 mu m or more. As shown in the same table. The uniform line width is preferable, and it is not preferable that the outer side (end portion) of the line is jagged. As shown in Table 1, all of the rubber blanks of the examples having the surface rubber cured in contact with the member (frame) having the surface roughness of 0.1 x Ra to 3 x Ra with respect to the arithmetic mean roughness (Ra) A good fine line pattern can be formed within the range of the line width of 3 mu m. The presence or absence of pinholes was also investigated and shown in the same table.

Fine line patterning using a rubber blanket of the comparative example having a surface rubber cured in contact with a member (frame) having a surface roughness out of the range of 0.1 x Ra to 3 x Ra relative to the arithmetic average roughness Ra of the substrate to be printed It is not possible to form a caustic line, the outer side (end portion) of the caustic line becomes jaggly, and a pinhole is generated, resulting in a defective product. On the contrary, in the thin line patterning using the rubber blanket of the embodiment, good caulking lines can be formed, and the outer side (end portions) of the caulking lines are few and the pinholes are not generated.

1 is a partial cross-section of a rubber blanket of an embodiment of the present invention.

2 is a partial cross-section of a rubber blanket of another embodiment of the present invention.

Fig. 3 schematically shows a state in which a caulk line pattern is transferred to a substrate using the rubber blanket of the embodiment of the present invention.

4 is a photograph showing a part of the appearance of a horn shape of the printed material of Example 1. Fig.

Fig. 5 is a photograph showing a part of the appearance of the horn shape of the printed product of Comparative Example 1. Fig.

Claims (7)

1. A printing rubber blanket used for printing a thin line pattern on a substrate, Wherein the arithmetic average roughness of the surface rubber of the rubber blanket has an arithmetic average roughness of 0.05 x Ra to 4.5 x Ra relative to the arithmetic average roughness (Ra) of the surface of the substrate. A method of producing a rubber blanket for use in printing a fine line pattern on a substrate, 1) preparing a substrate having an arithmetic mean roughness in the range of 0.1 x Ra to 3 x Ra relative to the arithmetic mean roughness (Ra) of the substrate; 2) pouring the liquid rubber on the surface of the substrate, then curing the liquid rubber as it is, 3) applying an adhesive to the cured rubber surface to form an adhesive layer, 4) attaching the base of the rubber blanket onto the adhesive layer, and 5) peeling the rubber blanket from the substrate after the surface rubber layer is cured. 3. The method of claim 2, Wherein the substrate is one of glass, PET film, PEN film, and polyimide film. The method according to claim 1, Wherein the raw material of the surface rubber is a silicone rubber. 3. The method of claim 2, Wherein the raw material of the surface rubber layer is a silicone rubber. A rubber blanket for printing obtained by the production method according to claim 2. A printing rubber blanket obtained by the production method according to claim 5.

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