JPH11334033A - Printer for color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply print a highly definite colored pattern by forming a number of stripe-like endless patterns on outer peripheries of gravure plate cylinders of respective color printing units. SOLUTION: Three sets of color printing units C1, C2 and C3 for printing red, green and blue colored patterns are arranged along a printing line L, and many endless patterns 5 made of stripe-like grooves are respectively formed on outer peripheries of gravure plate cylinders 4 of these units C1, C2 and C3. Furnisher rollers 3 and the cylinder 4 of the respective units C1 to C3 are driven synchronously with a rotation of an impression cylinder 8, stripe-like colored patterns 15 are transferred on a printing base material 7, pressed on a material 17 to be printed by a transfer mold 24a of a transfer unit 24, and heated to transfer colored pattern 15a of a predetermined shape onto the material 17, thereby manufacturing the color filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of a method for manufacturing a color filter.

[0002]

2. Description of the Related Art A color filter manufacturing process includes a process of forming a chromium film on a glass substrate by using a vacuum film forming method or the like;
Apply a photoresist, arrange a photomask and expose,
Development, chromium etching, photoresist stripping to form a black matrix consisting of a stripe pattern or grid pattern, and applying a color sensitive material from above the black matrix, then arranging a photomask and exposing and developing To form a colored pattern, repeating this colored pattern for R, G and B colors to form a plurality of colored layers, and forming a protective layer (overcoat layer) on these colored layers as necessary And a step of forming indium tin oxide to form a transparent conductive layer (ITO).

As described above, a photolithography method is used to form a high-definition colored pattern of a color filter. However, this method is manufactured through a number of steps, and requires a large-scale apparatus for mass production. In need.
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.

Conventionally, as a method of printing a high-definition pattern, a gravure offset method disclosed in, for example, Japanese Patent Application Laid-Open No. 62-85202 is known, but transfer of a transfer from a blanket (intermediate cylinder) to a printing substrate is known. At that time, a change in shape occurred, and the plate shape was not accurately reproduced, and it was difficult to reproduce the plate shape at a level of several tens of μm.

To solve this problem, the present inventor has
Separately, a high-definition printing method for transferring the ink in the intaglio to a printing substrate having a viscoelastic layer on the surface has been proposed.

[0006]

Although the above high-definition printing method has enabled high-resolution gravure printing, a new problem arises when applied to multicolor printing. Normally, in multicolor printing by the gravure printing method, a method of arranging a plurality of printing units along a printing line and performing multicolor printing is performed.

However, registration in multi-color printing by the gravure printing method is performed by detecting an alignment mark,
It is necessary to perform precise control by tension control, position correction, etc. of the printing base material. With this, even in a high-definition printing pattern, there is a limit in registration and ± 100 m
It was difficult to make it less than μ.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a printing apparatus for a color filter which can easily print a high-definition colored pattern.

[0009]

For this purpose, a printing apparatus for a color filter according to the present invention is provided with a printing line L on a printing substrate 7.
Color printing units C1 and C
2 and C3, and a transfer device disposed downstream of the color printing units C1 to C3.
A large number of stripe-like endless patterns 5 are formed on the outer peripheral surfaces of the plate cylinders 1 and C1 to C3. Note that the numbers added to the above configuration are compared with the drawings for easy understanding of the present invention, and the present invention is not limited thereto.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a diagram for explaining a gravure printing method employed in the present invention.

In the printing apparatus 1, the ink 2 is uniformly adhered to the rotating furnisher roller 3, and then the gravure cylinder 4 rotates in contact with the furnisher roller 3.
The printing pattern 5 formed above is filled with ink, and the 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 printed on the surface of the printing substrate 7. The ink pattern 9 filled in 5 is transferred.

FIG. 4 is a view showing a process of transferring ink from the gravure cylinder to the printing substrate in FIG. FIG.
In (A), the printing substrate 7 is brought into close contact with the surface of the gravure cylinder 4 by the impression cylinder 8 with a predetermined pressure.
When the printing base material 7 is pressed from the back side by the impression cylinder 8 and is brought into contact with the pattern non-formation part 10 of the gravure cylinder 4, the tack layer 12 formed on the surface of the support 11 of the printing base material 7 becomes non-patterned. It adheres closely to the forming part 10.

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 base material 7 comes into contact with the printing pattern 5 and the transfer of the ink to the printing base material 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 pattern non-formed portion 10 of the gravure cylinder 4. As shown in FIG. 4 (B), the transfer of the printing base material 7 moved with the rotation proceeds in a state where a part of the printing base material 7 is in contact with the pattern non-forming portion 14 near the printing pattern 5, so that accurate positioning can be achieved. The transfer is completed in the state where the transfer has been performed.

The support 11 of the printing substrate 7 has a thickness of 1
A synthetic resin film having a large strength and a large Young's modulus, such as a synthetic resin film of polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, polyphenylene sulfide, polyamide, polyimide, polyamide imide, aromatic polyamide, etc. Is preferred. The tack layer 12 has a thickness of 20 to
50 μm, having viscoelasticity or tackiness, specifically, adhesiveness to gravure cylinder, thickening property of ink by absorption of solvent at the time of transfer of ink, and peeling off easily from support by heating Materials having properties, for example, dimethylpolysiloxane, butyl acrylate, 2-ethylhexyl acrylate, butyl methacrylate, 2-isocyanatoethyl, methacrylate, or dimethyl polysiloxane, methylphenyl polysiloxane, or methyl fluoropolysiloxane are preferably used as the silicone copolymer. The tack layer 12 has a feature that the shape of the transferred ink pattern is accurately reproduced due to the viscoelasticity or tackiness of the surface when the ink is transferred.

FIG. 5 is a diagram for explaining the transfer of ink to the tack layer in FIG. As the support 11 of the printing base material 7, a synthetic resin film having high strength is used. Since these substrates do not allow the solvent in the ink to penetrate, the transferred ink gradually evaporates from the surface and the shape of the transfer ink pattern 15 becomes stable. Since the tack layer 12 has the function of absorbing the solvent of the ink, when the ink is transferred to the tack layer 12, the solvent 16 in the ink is absorbed by the tack layer 12, and the solvent in the ink pattern is absorbed. Decreases,
The ink increases the viscosity, and the retention of the pattern shape is improved. Since such characteristics are developed from the start of transfer to the tack layer, the shape of the ink pattern is accurately transferred onto the tack layer 12.

Next, the ink pattern formed on the obtained printing base material is transferred to a printing medium. FIG. 6 is a diagram for explaining a transfer method to a printing medium. Printing base material 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 pressing 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.

FIG. 1 shows an embodiment of a color filter printing apparatus according to the present invention, and FIG.
1B is a perspective view of the gravure cylinder 4 shown in FIG.
(C) is a plan view of the colored pattern transferred to the printing substrate,
FIG. 1D is a plan view of the coloring pattern transferred to the printing medium.

In FIG. 1A, three sets of color printing units C1, C2 and C3 for printing red, green and blue coloring patterns are provided along a printing line L. Each of the color printing units C1 to C3 includes the ink 2, the furnisher roller 3, the gravure cylinder 4, and the doctor 6 described with reference to FIG. The printing substrate 7 wound around the supply roll 20 is wound around a winding roll 22 via a tension roll 21, a peripheral surface of each impression cylinder 8, a buffer roll 23 and a transfer device 24. As shown in FIG. 1B, on the outer peripheral surface of each gravure cylinder 4, a large number of endless patterns 5 each composed of a groove in the form of a stripe are formed.

The operation of the printing apparatus for a color filter according to the present invention having the above configuration will be described. The furnisher roller 3 and the gravure cylinder 4 of each of the color printing units C1 to C3 are driven in synchronization with the rotation of the impression cylinder 8, and
As shown in FIG. 1 (C), the striped colored pattern 15 is transferred thereon, and the printing base material 7 to which the printing pattern is transferred is transferred to a printing medium (glass substrate) by the transfer die 24a of the transfer device 24. 1), heated, and as shown in FIG. 1 (D), a colored pattern 15a having a predetermined shape is transferred onto the printing medium 17, and a color filter is manufactured by a well-known method.

In this embodiment, one colored pattern 15a is transferred to one printing medium, 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 that forms a pattern shape of a color filter when a print pattern is transferred to a printing medium.
Transfer mold having one solid shape in which a color pattern of one color filter (one surface) is transferred to one print medium, 1
A transfer type having two solid shapes in which the color patterns of two (two sides) color filters are transferred to a printing medium, and a stripe type transfer type for selectively transferring the color patterns. can give.

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, the present 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 supplies the ink to the pattern 5 made of the resin relief plate formed on the plate cylinder 25 which 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, so that the printing cylinder 25
In this method, the ink pattern 9 supplied to the print pattern 5 is transferred.

[0022]

As is apparent from the above description, according to the present invention, it is possible to provide a printing apparatus for a color filter which can easily print a high-definition colored pattern.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a color filter printing apparatus according to the present invention, FIG. 1 (A) is a sectional view, and FIG. 1 (B) is FIG.
1A is a perspective view of the gravure cylinder 4, FIG. 1C is a plan view of a coloring pattern transferred to a printing substrate, and FIG. 1D is a plan view of the coloring pattern transferred to a printing medium. .

FIG. 2 is a view 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.

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 to C3: color printing unit L: printing line 4, 25: plate cylinder 5: stripe-like endless pattern 57: printing substrate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Sonehara 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Mio Makino 1-chome, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd.

Claims (2)

[Claims] 1. A color printing unit comprising: a plurality of color printing units provided along a printing line of a printing substrate; and a transfer device provided downstream of the color printing units. A printing device for a color filter, wherein a large number of stripe-like endless patterns are formed on a surface. 2. The color filter printing apparatus according to claim 1, wherein the transfer device has a transfer die having a pattern shape of a color filter corresponding to a size to be transferred to a printing medium.