JP5452880B2 - Rubber blanket for printing - Google Patents

Description

  The present invention relates to a rubber blanket for printing, and in particular, prints fine line patterns such as a color filter (hereinafter referred to as CF) pattern for a liquid crystal display (hereinafter referred to as LCD) and an electrode pattern for a plasma display panel (hereinafter referred to as PDP). The present invention relates to a rubber blanket used in manufacturing and a manufacturing method thereof.

  In recent years, it has been actively studied to perform patterning of fine lines using an offset printing method. In other words, we are actively investigating the printing of LCD CF patterns on glass substrates using the offset printing method, the printing of electrode patterns for PDPs, and the printing of various circuit patterns on various resin films. Has been. The reason why this printing method is being studied is that it is advantageous in terms of cost because the process is simplified and a large facility is not required. However, the fine line patterning by this printing method is required to reduce the cost without reducing the performance level such as the image line shape as compared with the conventional method.

  In the offset printing, a rubber blanket is used for pattern transfer onto a final printing medium. A rubber blanket is a base material made of a composite of a base fabric and rubber. An organic rubber material is placed as a surface rubber and its surface is polished. It has been widely used for newspaper printing and commercial printing. I came. However, for fine line patterning, conventional rubber blankets have many surfaces that are difficult to apply, such as rough surface and poor ink transfer rate, so the surface properties of rubber blankets can be modified and the materials that make up rubber blankets can be developed. Is underway.

  In order to carry out fine line patterning, it is necessary to provide a rubber blanket having a surface roughness that matches the surface roughness of the printed material as much as possible. As the surface rubber, silicone rubber is particularly preferable because of its excellent releasability, and the ink transfer rate can be very high compared to other organic rubbers.

  Also, the surface roughness of the rubber blanket is very important when performing fine line patterning. When the surface roughness of the rubber blanket is large, the image line is disturbed, and the adhesion between the rubber blanket and the ink material is strengthened, causing the problem of occurrence of pinholes.

  In general, the surface roughness of the rubber blanket is preferably as small as possible within the range that can be processed in thin line patterning so far, but it is technically difficult to control the surface roughness to be small, and the surface roughness is reduced. If it tries to do so, other various members required for manufacture of a rubber blanket will become expensive, and it will cause a cost increase, such as a complicated manufacturing process. Also, if the surface roughness of the rubber blanket is too small, depending on the printing conditions, the adhesive force between the printing plate or substrate and the rubber blanket will increase, conversely reducing the transfer rate or reducing the print quality. It is also known that it can cause problems.

  Until now, various proposals have been made on the surface roughness of rubber blankets used for fine line patterning and the manufacturing method thereof. For example, it is proposed to use a rubber blanket having a surface rubber with an arithmetic average roughness Ra of 0.1 nm to less than 20 nm and a ten-point average roughness Rz of 0.1 nm to less than 100 nm for PDP electrode substrate printing. (For example, Patent Document 1). Also, a rubber blanket having a surface rubber layer with a ten-point average roughness Rz of 2 μm or less and an arithmetic average roughness Ra of 0.2 nm or less is preferred for printing a polymer electroluminescent material (for example, a patent Literature 2.). Also, a rubber blanket manufacturing method has been proposed in which a base material and a smooth member are arranged in parallel in a mold, a rubber raw material is injected and cured therein, and a smooth rubber is peeled off to form a surface rubber ( For example, Patent Document 3). In addition, a rubber blanket manufacturing method has been proposed in which surface rubber molding is performed by bringing a base material into close contact with a horizontal base, pouring a liquid rubber material onto the base material, and self-leveling and curing as it is (for example, patents) Reference 4.).

Japanese Patent Laying-Open No. 2005-190969 (Claim 1) JP-A-2005-310411 (Claim 1) JP-A-8-112981 (Claim 1) JP 2003-136856 A (Claim 1)

  However, although the technology of Patent Document 1 defines the surface properties of the blanket for printing, the arithmetic average roughness Ra of the surface is 0.1 to 20 nm and the ten-point average roughness Rz is 0.1 to 100 nm. Even if a blanket for printing is used, if even smoothness is required depending on the surface properties of the substrate, blankets with surface properties in this range may not be sufficiently smooth, but depending on the substrate, A blanket with a higher surface roughness may be required.

  Similarly, since the technique of Patent Document 2 does not prescribe any relationship between the surface property of the printing medium and the rubber blanket, the smoothness of the surface property necessary and sufficient for the surface property of the printing material also in this case It is not a surface property having

  The technique of Patent Document 3 is formed by injecting and molding a surface rubber layer material between a base material and a releasable sheet having a surface roughness of 1 μm or less arranged so as to be opposed to and separated from a base material in a mold, Then, this surface sheet is peeled off, but this also does not prescribe any relationship between the surface properties of the printed material and the rubber blanket as in the prior art, and in this case also the surface properties of the material to be printed Therefore, the surface properties are not necessary and sufficient. Moreover, although the technique of patent document 4 makes liquid rubber self-leveling and hardens | cures, the surface property related to the surface property of a to-be-printed body also in this case is not.

  As described above, the conventional technology defines the surface roughness of the rubber blanket regardless of the surface roughness of the printing material, and the manufacturing method does not discuss the relationship with the surface roughness of the printing material. Absent. In practice, printed materials have various surface roughness depending on their use, and rubber blankets also have to have an optimum surface roughness according to them. Conventionally, the surface roughness of printed materials and rubber blankets has been required. The current situation is that the relationship between the rubber and the method of manufacturing the rubber blanket is not known.

  According to the present invention, in a rubber blanket for fine line patterning, the surface roughness of the surface rubber of the rubber blanket can be printed in a predetermined range with respect to the surface roughness of the surface of the substrate to be printed. The present invention has been found and further clarified a method for producing a rubber blanket having a predetermined surface roughness.

The present invention relates to a rubber blanket used for fine line patterning in which the printing medium is a glass substrate or a plastic film, and the arithmetic average roughness of the rubber blanket surface rubber is the arithmetic average roughness Ra of the printing medium surface. a Gomuburanke' bets with 0.05 × R a or al 4.5 × roughness values of R a against.

  According to this invention, it is possible to print a good pattern by optimizing the arithmetic average roughness of the surface of the rubber blanket necessary for fine line patterning with respect to the printing medium. Further, the blanket is manufactured by transferring the surface shape of the printed material itself or a member having a surface roughness within a predetermined range onto the rubber surface of the rubber blanket, so that development costs can be kept low and inexpensive. A rubber blanket can be manufactured.

Rubber blanket of the invention is a rubber blanket having an arithmetic mean roughness of 0.05 × R a or al 4.5 × R a against the arithmetical mean roughness R a of the printing surface. The inventor has found that the shape of the image line is improved by optimizing the surface roughness of the rubber blanket used for fine line patterning in relation to the printing medium. The surface roughness of the rubber blanket in that case, not limited to the same surface roughness of the printing material, against the arithmetic mean roughness R a of the surface of the printing material, 0.05 × R a or al 4. It is preferable to use a rubber blanket having an arithmetic average roughness Ra in the range of 5 × Ra.

To the arithmetic mean roughness Ra of the surface of the printing material, the 0.05 × R a non Mitsurude may lead to defective transfer by the printing conditions (partial streaking disturbance). Moreover, against the arithmetic mean roughness R a of the printing surface, 4.5 × case of using a rubber blanket having a larger arithmetic mean roughness exceeds the value of R a, large surface roughness of the surface rubber view The line is disturbed. In addition, the adhesion between the ink and the rubber blanket is increased, and defects such as pinholes may occur. When the inventors have repeated experiments, against the arithmetic mean roughness R a of the printing surface, using the rubber blanket having an arithmetic average roughness of 0.05 × R a or al 4.5 × R a When printed on the substrate, the line shape can be improved and defects such as pinholes can be eliminated.

Further, as a method for producing the rubber blanket, the member having an arithmetic mean roughness in the range of for the arithmetic mean roughness R a 0.1 × R a or al 3 × R a printing material, a rubber blanket It has been found that the surface roughness of the surface rubber can be obtained by curing the raw rubber of the surface rubber in contact with the surface rubber, and then removing the surface rubber after it is cured.

Further, as a method of manufacturing a blanket for obtaining a surface roughness, members having the arithmetic mean roughness of 0.1 × for the arithmetic mean roughness R a R a or al 3 × R a printing material (type) to, cured while in contact with the raw material of the surface rubber of the rubber blanket, then when performing molding surface rubber by peeling it, the arithmetic mean roughness of the rubber blanket 0.05 × R a or al be a 4.5 × R a revealed.

For the rubber blanket and the rubber blanket producing member (mold), especially against the arithmetical mean roughness R a of the printing surface, having an arithmetic mean roughness of 0.1 × R a or al 3 × R a it is preferred to use members, more preferably a member having an arithmetic average roughness value of 0.2 × R a or al 2 × R a.

How to transfer the surface roughness of the printing material to the surface rubber of the rubber blanket, × 0.1 against the arithmetical mean roughness R a of the printing surface on a horizontal pedestal R a or al 3 × R a surface of A rough member (mold material) is adhered horizontally, and a liquid rubber raw material is coated thereon by various methods and cured, and then an adhesive is applied to the rubber surface to bond a blanket substrate. There is a method of manufacturing a rubber blanket by transferring the surface shape by peeling off the mold from the mold material. In addition to this, a blanket base material and a substrate to be printed (mold material) are placed in parallel in a mold, a liquid rubber raw material is injected between the blanket base material and the mold material, and then cured and peeled off from the mold material. A blanket can also be manufactured. The former method using a horizontal frame without using a metal mold is preferable in that it can be manufactured regardless of the type of printing medium (mold material).

  FIG. 1 shows a rubber blanket as an example of the present invention, which is composed of 11 surface rubbers and a base material 12 underneath. The substrate 12 is composed of a polyethylene terephthalate film (hereinafter referred to as PET film) 121 directly under the surface rubber 11, a compression layer 122, and a polyester cloth 123 as the lowermost layer below the compression layer 122. The base material may be a known woven fabric such as cotton fabric, polyester fabric, nylon fabric, or various plastic films such as PET film, polyethylene naphthalate film (hereinafter referred to as PEN film), polyimide film, or these woven fabric or plastic film. And a composite material such as a rubber material. It is preferable to dispose a compressed layer containing closed or open cells in the layer of the base material portion. By introducing this compressed layer into the substrate, it is possible to prevent the occurrence of bulges during printing and to expect an improvement in the dimensional accuracy of the printed matter.

  For the surface rubber layer, existing rubber raw materials such as acrylonitrile-butadiene rubber, ethylene propylene rubber, natural rubber, and silicone rubber can be used. Among these, silicone rubber has an excellent ink transfer rate on the rubber surface. As the silicone rubber, it is preferable to use a liquid raw material that can easily transfer and process the surface shape of the printing body (mold).

  The thickness of the surface rubber layer is preferably 0.1 to 1 mm, more preferably 0.3 to 0.8 mm. When the thickness of the surface rubber layer is less than 0.1 mm, the influence of the lower layer base material is also reflected on the surface rubber, causing a problem in surface flatness. When the thickness of the surface rubber is larger than 1 mm, the volume change of the surface rubber layer due to the solvent swelling to the surface rubber layer when using the rubber blanket becomes large, resulting in a problem of deterioration in printing accuracy.

  The substrate to be printed is not particularly limited. Glass substrates are used for LCD CF or PDP electrodes, and are most widely studied as applications for fine line patterning. Various plastic films are also subject to circuit patterning. In addition to existing films such as PET film, PEN film, and polyimide film, these plastic films are coated with acrylic resin or polyester resin to smooth the surface. A thing with improved ink adhesion or the like is used.

  As the mold material used in the blanket manufacturing, the printing body itself is desirable, but a material having a surface roughness equivalent to that of the printing body can be applied instead of the printing body itself. When these mold materials are used for the production of rubber blankets, it is preferable to perform a mold release treatment in order to increase the number of times they can be used. As the material used for the mold release treatment, a fluorine-containing material, a material that is a liquid raw material of a silicon-containing material, or the like is used, and it is uniformly applied on the mold material by a method such as dipping, wiping, or spraying. By forming the rubber blanket surface rubber as described above using this mold material, it is possible to easily produce a rubber blanket having a surface roughness required for a substrate to be printed at low cost.

  FIG. 2 shows a rubber blanket according to another embodiment, 21 is a surface rubber TSE3453T (a product of Momentive Performance Materials Japan GK, two-pack silicone rubber), and the thickness is 0.4 mm. The base material 22 is obtained by bonding a 0.1 mm PET film S-10 (Toray Industries, Inc.) 221 to a 0.5 mm flexible polyurethane foam 222 with an adhesive.

  The concept of a letterpress printing press using this blanket is shown in FIG. 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 from the slit die 33. A solid film of ink is formed on the rubber blanket 31. A necessary image pattern remaining on the rubber blanket 31 after the ink in the non-image area is removed by the printing plate 34 is transferred to the printing medium 35.

Example 1
A CF grade glass substrate for LCD was used as the substrate. The arithmetic average roughness of this glass substrate was 0.5 nm. This glass substrate is brought into close contact with a horizontal base, a surface rubber raw material (liquid silicone rubber) is poured onto it and cured as it is, an adhesive is applied onto the cured rubber, and a rubber blanket base material is pasted thereon. Combined. After the rubber was cured, the rubber was peeled off from the glass substrate to obtain a rubber blanket having a rubber layer on the surface. The arithmetic average roughness of this rubber blanket was 0.5 nm. A predetermined image line was printed on the glass substrate using the rubber blanket. The quality of the line shape of the printed matter was judged by using silver paste as the ink and the line pattern as a stripe pattern having a line width of 25 μm on the printing plate design value. In addition, the presence or absence of pinhole defects in the image line was examined. As a result, a good line shape was obtained and no pinholes were generated.

Example 2
A CF grade glass substrate for LCD was used as the substrate. The arithmetic average roughness of the glass substrate was 0.5 nm. On the other hand, a PET film whose surface was coated with an acrylic resin to improve smoothness was prepared. The arithmetic average roughness 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 horizontal base, and a rubber blanket surface rubber material was poured thereon. A rubber blanket base material was bonded on top of it. 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 of this rubber blanket was 2.0 nm. When a predetermined image line was printed on the glass substrate using this rubber blanket in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Example 3
A polyimide film was used for the substrate. The arithmetic average roughness of this polyimide film was 4.8 nm. Meanwhile, a CF grade glass substrate for LCD was prepared as a mold material for blanket molding. The arithmetic average roughness of this glass substrate was 0.5 nm. This glass substrate was placed in a predetermined mold in parallel with the blanket base material, and a surface rubber raw material was injected between the base material and the glass substrate. After the rubber was cured, the glass substrate integrated with the base material was taken out from the mold, and the glass substrate was peeled off from the base material to obtain a printing rubber blanket. The arithmetic average roughness of this rubber blanket was 0.3 nm. When this rubber blanket was used to print a predetermined line on the polyimide film in the same manner as in Example 1, a good line shape was obtained and no pinholes were generated.

Example 4
A polyimide film was used for the substrate. The arithmetic average roughness of this polyimide film was 4.8 nm. On the other hand, in order to improve the smoothness of the surface, a PET film having a polyester resin coated on the surface was prepared as a mold material. The arithmetic average roughness of this PET film was 1.6 nm. In the same manner as in Example 1, this PET film was brought into intimate contact with a horizontal frame, a rubber blanket surface rubber material was poured thereon, and a rubber blanket base material was bonded thereto. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket for printing. The arithmetic average roughness of this rubber blanket was 0.9 nm. When a predetermined image line was printed on the polyimide film using this rubber blanket in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Example 5
A polyimide film was used for the substrate. The arithmetic average roughness of this polyimide film was 4.8 nm. This polyimide film was brought into intimate contact with a horizontal frame, and a rubber blanket surface rubber raw material was poured onto the polyimide film. After the rubber was cured, an adhesive was applied and the substrates were bonded together. After the rubber was cured, the polyimide film was peeled off to obtain a rubber blanket for printing. The arithmetic average roughness of this rubber blanket was 6.5 nm. When a predetermined image line was printed on the polyimide film using this rubber blanket in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Example 6
A polyimide film was used for the substrate. The arithmetic average roughness of this polyimide film was 4.8 nm. On the other hand, an ultra-high transparency grade PET film was prepared as a mold material. The arithmetic average roughness of this PET film was 13.8 nm. In the same manner as in Example 1, this PET film was brought into intimate contact with a horizontal frame, a rubber blanket surface rubber material was poured thereon, and a rubber blanket base material was bonded thereto. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket for printing. The arithmetic average roughness of this rubber blanket was 20.4 nm. When a predetermined image line was printed on the polyimide film using this rubber blanket in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Example 7
An ultra-high transparency grade PET film was used as the substrate. The arithmetic average roughness of this ultra-high transparency grade PET film was 13.8 nm. On the other hand, a PET film whose surface was coated with an acrylic resin was prepared as a mold material. The arithmetic average roughness 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 horizontal frame, and the rubber blanket surface rubber material was poured onto it to cure the rubber while being in contact with the PET film, and the rubber was cured. Later, an adhesive was applied, the base material of the blanket was bonded, the acrylic resin-coated PET film was peeled off, and a rubber blanket was obtained. The arithmetic average roughness of this rubber blanket was 0.7 nm. Using this rubber blanket, a predetermined image line was printed on the ultra-high transparency grade PET film in the same manner as in Example 1. As a result, a good image line shape was obtained and no pinholes were generated.

Example 8
An ultra-high transparency grade PET film was used as the substrate. The arithmetic average roughness of this ultra-high transparency grade PET film was 13.8 nm. On the other hand, a highly transparent grade PET film was prepared as a mold material. The arithmetic average roughness of the latter highly transparent grade PET film was 15.2 nm. This PET film was placed in parallel with the blanket substrate in the mold in the same manner as in Example 3, the blanket surface rubber material was injected between the substrate and the PET film, cured, and then removed from the mold, and the PET film was removed. A peel rubber blanket was obtained. The arithmetic average roughness of this rubber blanket was 9.1 nm. Using this rubber blanket, a predetermined image line was printed on the ultra-high transparency grade PET film in the same manner as in Example 1. As a result, a good image line shape was obtained and no pinholes were generated.

Example 9
An ultra-high transparency grade PET film was used as the substrate. The arithmetic average roughness of this ultra-high transparency grade PET film was 13.8 nm. On the other hand, a transparent grade PET film was prepared as a mold material. The arithmetic average roughness of this latter PET film was 40.8 nm. This PET film was placed in parallel with the blanket substrate in the mold in the same manner as in Example 3, the blanket surface rubber material was injected between the substrate and the PET film, cured, and then removed from the mold, and the PET film was removed. A peel rubber blanket was obtained. The arithmetic average roughness of this rubber blanket was 60.9 nm. Using this rubber blanket, a predetermined image line was printed on the ultra-high transparency grade PET film in the same manner as in Example 1. As a result, a good image line shape was obtained and no pinholes were generated.

Example 10
A highly transparent grade PET film was used as the substrate. The arithmetic average roughness of this highly transparent grade PET film was 15.2 nm. On the other hand, a PET film having a polyester resin coated on the surface was prepared as a mold material. The arithmetic average roughness of this latter polyester resin coated PET film was 1.6 nm. This PET film was placed in parallel with the blanket substrate in the mold in the same manner as in Example 3, the blanket surface rubber material was injected between the substrate and the PET film, cured, and then removed from the mold, and the PET film was removed. A peel rubber blanket was obtained. The arithmetic average roughness of this rubber blanket was 0.8 nm. When this rubber blanket was used to print a predetermined image line on the highly transparent grade PET film in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Example 11
A highly transparent grade PET film was used as the substrate. The arithmetic average roughness of this highly transparent grade PET film was 15.2 nm. On the other hand, an ultra-high transparency grade PET film was prepared as a mold material. The arithmetic average roughness of this PET film was 13.8 nm. In the same manner as in Example 1, this ultra-high transparency grade PET film was brought into close contact with a horizontal frame, and a rubber blanket surface rubber material was injected thereon, and a rubber blanket base material was bonded thereto. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket for printing. The arithmetic average roughness of this rubber blanket was 20.4 nm. When a predetermined image line was printed on the highly transparent grade PET film using this rubber blanket in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Example 12
A highly transparent grade PET film was used as the substrate. The arithmetic average roughness of this highly transparent grade PET film was 15.2 nm. On the other hand, a transparent grade PET film was prepared as a mold material. The arithmetic average roughness of this PET film was 45.0 nm. In the same manner as in Example 1, this PET film was brought into intimate contact with a horizontal frame, a rubber blanket surface rubber material was poured thereon, and a rubber blanket base material was bonded thereto. After the rubber was cured, the PET film was peeled off to obtain a rubber blanket for printing. The arithmetic average roughness of this rubber blanket was 67.3 nm. When a predetermined image line was printed on the highly transparent grade PET film using this rubber blanket in the same manner as in Example 1, a good image line shape was obtained and no pinholes were generated.

Comparative Example 1
A CF grade glass substrate for LCD was used as the substrate. The surface roughness of the glass substrate was 0.5 nm. On the other hand, a PET film whose surface was coated with a polyester resin was prepared. The arithmetic average roughness of this PET film was 1.6 nm. This PET film was brought into close contact with a horizontal frame, and a rubber blanket surface rubber raw material was poured onto the PET film. A rubber blanket base material was bonded on top of it. 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 of this rubber blanket was 2.4 nm. When a predetermined image line was printed on the glass substrate by using this rubber blanket, the image line was completely disturbed and some pinholes were also confirmed.

Comparative Example 2
A PET film having an acrylic resin coated on the surface was used as the printing material. The arithmetic average roughness of this PET film was 1.4 nm. On the other hand, a polyimide film was prepared as a mold material. The arithmetic average roughness of this polyimide film was 4.8 nm. In the same manner as in Example 1, this PET film was brought into intimate contact with a horizontal frame, a rubber blanket surface rubber material was poured thereon, and a rubber blanket base material was bonded thereto. 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 of this rubber blanket was 6.5 nm. When a predetermined image line was printed on the PET film coated with the above acrylic resin using this rubber blanket in the same manner as in Example 1, disorder of the image line was confirmed on the entire printed surface. There were no pinholes.

Comparative Example 3
A PET film having an acrylic resin coated on the surface was used as the printing material. The arithmetic average roughness of this PET film was 1.4 nm. Meanwhile, an ultra-high transparency grade PET film was prepared as a mold material. The arithmetic average roughness of this PET film was 13.8 nm. In the same manner as in Example 1, this ultra-high transparency grade PET film was brought into close contact with a horizontal frame, and a rubber blanket surface rubber material was poured thereon, and a rubber blanket base material was bonded thereto. 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 of this rubber blanket was 10.4 nm. When a predetermined image line was printed on the PET film having the acrylic resin coated on the surface using this rubber blanket in the same manner as in Example 1, disorder of the image line was confirmed as a whole. Pinholes were also observed.

Comparative Example 4
A polyimide film was prepared as a substrate to be printed. The arithmetic average roughness of this polyimide film was 4.8 nm. On the other hand, a glass substrate whose surface was precisely polished was prepared as a mold material. The arithmetic average roughness of this glass substrate was 0.4 nm. The glass substrate was brought into close contact with a horizontal frame, and a rubber blanket surface rubber material was poured onto the glass substrate. A rubber blanket base material was bonded 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 of this rubber blanket was 0.2 nm. When this rubber blanket was used to print a predetermined image line on the polyimide film in the same manner as in Example 1, no pinholes were generated, but the image line was locally disturbed.

Comparative Example 5
A polyimide film was prepared as a substrate to be printed. The arithmetic average roughness of this polyimide film was 4.8 nm. On the other hand, a highly transparent grade PET film was prepared as a mold material. The surface roughness of this PET film was 15.2 nm. The PET film was placed in the mold in parallel with the blanket substrate in the same manner as in Example 3, the blanket surface rubber raw material was injected between the substrate and the PET film, cured, and then taken out from the mold. Was removed to obtain a rubber blanket. The arithmetic average roughness of this rubber blanket was 22.2 nm. When a predetermined image line was printed on the polyimide film using this rubber blanket in the same manner as in Example 1, no pinholes were generated, but the image line was confirmed to be disordered.

Comparative Example 6
An ultra-high transparency grade PET film was used as the substrate. The arithmetic average roughness of this ultra-high transparency grade PET film was 13.8 nm. On the other hand, a glass substrate was prepared as a mold material. The arithmetic average roughness of this glass substrate was 0.5 nm. This glass substrate was placed in parallel with the blanket base material in the mold in the same manner as in Example 3, and a blanket surface rubber raw material was injected between the base material and the glass substrate, cured, and then removed from the mold. The surface rubber was peeled from the glass substrate to obtain a rubber blanket. The arithmetic average roughness of this rubber blanket was 0.5 nm. When this rubber blanket was used to print a predetermined image line on the ultra-high transparency grade PET film in the same manner as in Example 1, no occurrence of pinholes was confirmed, but the image line was partially disturbed. confirmed.

Comparative Example 7
An ultra-high transparency grade PET film was used as the substrate. The arithmetic average roughness of this ultra-high transparency grade PET film was 13.8 nm. On the other hand, a general-purpose PP film was prepared as a mold material. The arithmetic average roughness of this PP film was 45.0 nm. This PP film is placed in parallel with the blanket base material in the mold in the same manner as in Example 3, and the rubber material of blanket surface rubber is injected between the base material and the PP film, cured, and then taken out from the mold. The PP film was peeled off to obtain a rubber blanket. The arithmetic average roughness of this rubber blanket was 67.3 nm. Using this rubber blanket, a predetermined image line was printed on the ultra-high transparency grade PET film in the same manner as in Example 1. As a result, disturbance of the image line was confirmed on the entire printed surface and generation of pinholes was also observed.

Comparative Example 8
A highly transparent grade PET film was used as the substrate. The arithmetic average roughness of this PET film was 15.2 nm. On the other hand, a glass substrate was prepared as a mold material. The arithmetic average roughness of this glass substrate was 0.5 nm. The glass substrate was brought into intimate contact with a horizontal base, and a rubber blanket base material was bonded thereon. 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 of this rubber blanket was 0.5 nm. Using this rubber blanket, a predetermined image line was printed on the above-mentioned highly transparent grade PET film in the same manner as in Example 1. As a result, overall image line disturbance was confirmed, but the occurrence of pinholes was confirmed. There wasn't.

Comparative Example 9
A highly transparent grade PET film was prepared as a substrate. The arithmetic average roughness of this PET film was 15.2 nm. On the other hand, a PET film coated on the acrylic resin surface was prepared as a mold material. The arithmetic average roughness of this PET film was 1.4 nm. In the same manner as in Example 3, this PET film was placed in parallel with the blanket substrate in the mold, the blanket surface rubber material was injected between the substrate and the PET film, cured, and then taken out from the mold. And a rubber blanket was obtained. The arithmetic average roughness of this rubber blanket was 0.7 nm. When this blanket was used to print a predetermined image line on the highly transparent grade PET film in the same manner as in Example 1, there was no occurrence of pinholes, but local disturbance of the image line was confirmed.

Comparative Example 10
A highly transparent grade PET film was prepared as a printing medium. The arithmetic average roughness of this PET film was 15.2 nm. On the other hand, a translucent grade PET film was prepared as a mold material. The arithmetic average roughness of this translucent PET film was 48.0 nm. This PET film was brought into close contact with a horizontal frame, and a rubber blanket surface rubber raw material was poured onto the PET film. A rubber blanket base material was bonded onto the rubber blanket, 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 of this rubber blanket was 69.6 nm. When this blanket was used to print a predetermined image line on the high transparency grade PET film in the same manner as in Example 1, it was confirmed that the entire image line was disordered and local pinholes were generated. The results of these examples and comparative examples are shown in Table 1.

As described above, against the arithmetic mean roughness R a of the printing substrate has a surface rubber cured in contact with the member (mold) having a surface roughness of 0.1 × R a or al 3 × R a All of the rubber blankets of the examples can form a fine line pattern. On the other hand, fine line patterning using a rubber blanket of a comparative example having a surface rubber molded with a mold out of this range cannot form a good image line or a pinhole is generated. It turns out that it becomes inferior goods.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] A rubber blanket used for fine line patterning, wherein the arithmetic average roughness of the rubber blanket surface rubber is 0.05 × Ra to 4.5 × Ra with respect to the arithmetic average roughness Ra of the surface of the printing medium. Rubber blanket for printing with arithmetic mean roughness of value.
[2] A method of manufacturing a rubber blanket used for fine line patterning, wherein the rubber blanket surface rubber is formed within a range of 0.1 × Ra to 3 × Ra with respect to the arithmetic average roughness Ra of the printed material. A rubber blanket for printing, in which a rubber raw material on the surface of the rubber blanket is brought into contact with a member having an arithmetic average roughness and cured, and then the surface rubber is cured and then the surface rubber is peeled off from the member to form a rubber blanket surface rubber. Production method.
[3] The rubber blanket for printing according to [1], wherein the raw material for the surface rubber layer is silicone rubber.

FIG. 1 is a sectional view of a rubber blanket according to the present invention. FIG. 2 is a sectional view of a rubber blanket according to another embodiment of the present invention. FIG. 3 is an explanatory view conceptually showing a state in which an image line pattern is printed on a printing medium using the rubber blanket of the present invention.

Explanation of symbols

  11, 21 ... Surface rubber, 12, 22 Base material layer, 31 Blanket, 32 Blanket cylinder, 33 Slit die, 34 Printing plate.

Claims (2)

A rubber blanket printing material is used fine line patterning a glass substrate or a plastic film, the arithmetic average roughness of the blanket surface rubber, against the arithmetic mean roughness R a of the surface of the printing material 0 .05 × R a or al 4.5 × the rubber printing blanket having an arithmetic mean roughness value of R a.   The rubber blanket for printing according to claim 1, wherein the raw material of the surface rubber layer is silicone rubber.

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