JP4274390B2 - Color filter printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of color filter manufacturing methods.
[0002]
[Prior art]
The color filter manufacturing process consists of a process of depositing chromium on a glass substrate using a vacuum film formation method, etc., and applying a photoresist and placing a photomask to perform exposure, development, chromium etching, and photoresist stripping. A step of forming a black matrix composed of a stripe pattern or a lattice pattern, and after applying a coloring light-sensitive material on the black matrix, a photomask is placed, exposed and developed to form a colored pattern. A process of repeating a pattern for R, G, and B colors to form a plurality of colored layers, a process of forming a protective layer (overcoat layer) on these colored layers as needed, and a film of indium tin oxide And forming a transparent conductive layer (ITO).
[0003]
As described above, a photolithography method is used to form a high-definition colored pattern of a color filter. This method is manufactured through a number of processes, and requires a large-scale apparatus for mass production. Yes. On the other hand, a method of forming a pattern by printing is a method suitable for mass production, but there is a problem that a pattern obtained by printing is inferior to photolithography in accuracy.
[0004]
Conventionally, as a method for printing a high-definition pattern, for example, a gravure offset method disclosed in Japanese Patent Laid-Open No. 62-85202 is known. The plate shape was not accurately reproduced, and it was difficult to reproduce the plate shape at a level of several tens of μm.
[0005]
In order to solve this problem, the present inventor has proposed a high-definition printing method in which the ink in the intaglio is separately transferred to a printing substrate having a surface having a viscoelastic layer.
[0006]
[Problems to be solved by the invention]
Although the above-described high-definition printing method enables high-definition gravure printing, a new problem arises when applied to multicolor printing. Usually, in multicolor printing by the gravure printing method, a method of performing multicolor printing by arranging a plurality of printing units along a printing line is performed.
[0007]
However, for multi-color printing in the gravure printing method, it is necessary to precisely control the alignment mark detection, printing substrate tension control, position correction, etc. There is a limit in registration, and it was difficult to make it below ± 100 mμ.
[0008]
An object of the present invention is to solve the above-described conventional problems, and to provide a color filter printing apparatus that can easily print a high-definition colored pattern.
[0009]
[Means for Solving the Problems]
For this purpose, the color filter printing apparatus of the present invention is arranged on the downstream side of the color printing units C1, C2, and C3 arranged along the printing line L of the printing substrate 7 and the color printing units C1 to C3. and a setting transcription unit, on the outer peripheral surface of the plate cylinder 4, 25 of each of the color printing units C1 to C3, wherein the stripe-shaped endless pattern 5 are formed a number. In addition, the number added to the said structure contrasts with drawing in order to make an understanding of this invention easy, and this invention is not limited at all by this.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a diagram for explaining the gravure printing method employed in the present invention.
[0011]
In the printing apparatus 1, the ink 2 is uniformly attached to the rotating finisher roller 3, and then the ink is filled into the printing pattern 5 formed on the rotating gravure cylinder 4 in contact with the finishing roller 3. Further, the ink surface of the printing pattern 5 is shaped by the doctor 6. Next, the printing substrate 7 is continuously supplied to the surface of the gravure cylinder 4 and pressed by the impression cylinder 8 rotating from the surface opposite to the gravure cylinder 4, and the printing pattern of the gravure cylinder 4 is formed on the surface of the printing substrate 7. The ink pattern 9 filled in 5 is transferred.
[0012]
FIG. 4 is a diagram illustrating a process in which ink is transferred from the gravure cylinder to the printing substrate in FIG. 3. In FIG. 4A, the printing substrate 7 is brought into close contact with the surface of the gravure cylinder 4 by a pressure drum 8 by a predetermined pressure. However, the printing substrate 7 is pressed from the back by the impression cylinder 8 to gravure cylinder 4. Is brought into contact with the pattern non-forming part 10, the tack layer 12 formed on the surface of the support 11 of the printing substrate 7 is in close contact with the pattern non-forming part 10.
[0013]
The tack layer 12 moves while changing the contact portion as the gravure cylinder 4 rotates. As shown in FIG. 4A, at the stage where the surface of the printing substrate 7 comes into contact with the printing pattern 5 and the transfer of ink to the printing substrate 7 side starts, printing is performed in the vicinity 13 of the printing pattern forming portion. The tack layer 12 on the surface of the substrate 7 is still in close contact with the non-pattern forming portion 10 of the gravure cylinder 4. As shown in FIG. 4B, the printing substrate 7 that has moved along with the rotation is transferred in a state where a part of the printing substrate 7 is in contact with the pattern non-forming portion 14 in the vicinity of the printing pattern 5, so that the positioning is accurately performed. The transfer is completed in the performed state.
[0014]
The substrate 11 of the printing substrate 7 has a thickness of 10 to 50 μm, and is a synthetic resin film such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyphenylene sulfide, polyamide, polyimide, polyamideimide, aromatic polyamide, etc. A synthetic resin film having a large strength such as a large Young's modulus is suitable. The tack layer 12 has a thickness of 20 to 50 μm and has viscoelasticity or tackiness. Specifically, it has adhesiveness to a gravure cylinder, and ink thickening properties due to absorption of a solvent during ink transfer. In addition, a material having a peeling property that can be easily peeled off from a support by heating, for example, dimethylpolysiloxane, butyl acrylate, 2-ethylhexyl acrylate, butyl methacrylate, 2-isocyanatoethyl, methacrylate, or dimethylpolysiloxane or methyl Phenyl polysiloxane or methyl fluoropolysiloxane is preferred. The tack layer 12 is characterized in that the shape of the transferred ink pattern is accurately reproduced due to the viscoelasticity or tackiness of the surface at the time of ink transfer.
[0015]
FIG. 5 is a view for explaining transfer of ink to the tack layer in FIG. A synthetic resin film having high strength is used for the support 11 of the printing substrate 7. Since these base materials do not penetrate the solvent in the ink, the transferred ink gradually volatilizes from the surface and the shape of the transfer ink pattern 15 is stabilized, but formed on the support 11. The tack layer 12 has a function of absorbing the solvent of the ink. Therefore, when the ink is transferred to the tack layer 12, the solvent 16 in the ink is absorbed into the tack layer 12, and the solvent in the ink pattern is absorbed. , The viscosity of the ink increases, and the pattern shape retainability is improved. Such characteristics are manifested from the beginning of the transfer to the tack layer, so that the shape of the ink pattern is accurately transferred onto the tack layer 12.
[0016]
Next, the ink pattern formed on the obtained printing substrate is transferred to a printing medium. FIG. 6 is a diagram for explaining a transfer method to a printing medium. The printing substrate 7 has a transfer ink pattern 15 on a support 11 and is sent to a transfer roll 18 together with a printing medium 17. The pressure roll of the transfer roll 18 is pressurized and heated to a predetermined pressure and temperature, and the transfer ink pattern 15 is transferred from the tack layer to the printing medium 17.
[0017]
1A and 1B show an embodiment of a color filter printing apparatus according to the present invention. FIG. 1A is a cross-sectional view, FIG. 1B is a perspective view of a gravure cylinder 4 of FIG. C) is a plan view of the colored pattern transferred to the printing substrate, and FIG. 1D is a plan view of the colored pattern transferred to the printing medium.
[0018]
In FIG. 1A, along the printing line L, three sets of color printing units C1, C2, and C3 for printing red, green, and blue coloring patterns are arranged. Each of the color printing units C1 to C3 includes the ink 2, the finisher roller 3, the gravure cylinder 4, and the doctor 6 described in FIG. The printing substrate 7 wound around the supply roll 20 is wound around the winding roll 22 via the tension roll 21, the peripheral surface of each impression cylinder 8, the buffer roll 23 and the transfer device 24. As shown in FIG. 1 (B), on the outer circumferential surface of each of the gravure cylinder 4, the endless pattern 5 made of stripe-shaped grooves are formed a number.
[0019]
The operation of the color filter printing apparatus of the present invention having the above-described configuration will be described. Furnishing Tsu Shah roller 3 and the gravure cylinder 4 of each of the color printing units C1~C3 is driven in synchronism with rotation of the impression cylinder 8, on the printing substrate 7, as shown in FIG. 1 (C), striped 1 is transferred to the printing substrate (glass substrate) 17 by the transfer mold 24a of the transfer device 24, and the printed substrate 7 is transferred to the printed substrate 7 having the printed pattern transferred thereon, as shown in FIG. As described above, the colored pattern 15a having a predetermined shape is transferred onto the printing material 17, and a color filter is manufactured by a known method.
[0020]
In this example, one colored pattern 15a is transferred to one sheet of printing material, but a plurality of colored patterns may be transferred. The transfer mold 24a may have any shape as long as it has a transfer mold in which the pattern shape of the color filter is formed when the print pattern is transferred to the print medium. Transfer type having one solid shape to which the color pattern of one color filter (one surface) is transferred, and two color patterns of two (two surfaces) color filters are transferred to one printing medium transfer mold having a solid shape, transfer type, etc. of the stripe shape may be mentioned as to transfer the more selectively colored patterns.
[0021]
FIG. 2 is a diagram showing another embodiment of the color filter printing apparatus of the present invention. While the embodiment of FIG. 1 is a gravure printing method, this embodiment employs a flexographic printing method. That is, the ink 2 is uniformly attached to the mesh formed on the anix roll 26, and then the ink is supplied to the pattern 5 made of a resin relief plate formed on the plate cylinder 25 that rotates in contact with the anix roll 26, Next, the printing substrate 7 is continuously supplied to the surface of the plate cylinder 25 and pressed by the impression cylinder 8 rotating from the surface opposite to the plate cylinder 25, and the printing pattern of the plate cylinder 25 is formed on the surface of the printing substrate 7. In this method, the ink pattern 9 supplied to 5 is transferred.
[0022]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to provide a color filter printing apparatus capable of easily printing a high-definition colored pattern.
[Brief description of the drawings]
1A and 1B show a color filter printing apparatus according to an embodiment of the present invention, in which FIG. 1A is a cross-sectional view, FIG. 1B is a perspective view of a gravure cylinder 4 of FIG. C) is a plan view of the colored pattern transferred to the printing substrate, and FIG. 1D is a plan view of the colored pattern transferred to the printing medium.
FIG. 2 is a diagram showing another embodiment of the color filter printing apparatus of the present invention.
FIG. 3 is a diagram for explaining a gravure printing method employed in the present invention.
FIG. 4 is a diagram showing a process of transferring ink from a gravure cylinder to a printing substrate in FIG. 3;
FIG. 5 is a diagram for explaining transfer of ink to a tack layer in FIG. 4;
FIG. 6 is a diagram for explaining a transfer method to a printing medium.
[Explanation of symbols]
C1~C3 ... color printing unit L ... printing line 4, 25 ... plate cylinder 5 ... stripe-like endless pattern 57 ... printing substrate
more than

Claims (2)

A plurality of color printing units arranged along the printing line of the printing substrate and a transfer device arranged downstream of the color printing unit. A printing apparatus for a color filter, wherein a large number of end-like patterns are formed. 2. The color filter printing apparatus according to claim 1, wherein the transfer device has a transfer mold having a color filter pattern shape corresponding to a size to be transferred to a printing medium.

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