KR20120037319A - Blancket for printing - Google Patents

Abstract

PURPOSE: A printing blanket containing tacky materials is provided to minimize the defects of patterns and to form desired patterns by increasing the adhesive of the printing blanket to ink. CONSTITUTION: A printing blanket(114) containing tacky materials includes a cushion layer(114a), a supporting layer(114b), and a printing layer(114c). The cushion layer is based on silicon rubber. The supporting layer suppresses the non-uniform shrinkage of the cushion layer and improves the precision of printing by being stacked on the upper side of the cushion layer. The printing layer is stacked on the upper side of the supporting layer and includes tacky-fiber resin. The tacky-fiber resin is a silica-based resin material. The silica-based resin material includes trimethylated silica. The printing layer includes polydimethylsiloxane. The supporting layer is composed of the polymer film based on polyethylene terephthalate and polycarbonate, or the metallic thin film of aluminum and stainless.

Description

Blanket for Printing

The present invention relates to a blanket for printing, and more particularly, to a blanket for printing that can minimize pattern defects that may occur during printing.

In today's information society, display elements are more important than ever as visual information transfer media. Cathode ray tubes (CRT) or CRT tubes, which were once the mainstream, had problems with their weight and volume.

In order to solve this problem, liquid crystal display (LCD), field emission display (FED), organic light emitting diode display (OLED), etc. Most of these are commercially available and commercially available.

Among them, liquid crystal displays (LCDs) can satisfy the trend of light and thin and short, and mass production is improving, and thus, cathode ray tubes are rapidly replaced in many applications.

In general, a liquid crystal display (LCD) displays an image corresponding to the data signal on the liquid crystal display panel by adjusting the light transmittance of the liquid crystal cells arranged in a matrix form on the liquid crystal display panel. .

The liquid crystal display device includes a thin film transistor array substrate and a color filter array substrate that are bonded to each other with a liquid crystal layer interposed therebetween. Each component of the color filter array substrate or the thin film transistor array substrate is generally formed in various patterns through a mask process.

However, since the mask process for forming a pattern on a substrate includes many processes such as a thin film deposition process, a cleaning process, a photolithography process, an etching process, a photoresist stripping process, and an inspection process, the process is not only complicated but also manufactured. The disadvantage is that the unit price is high.

Accordingly, a reverse offset printing method, which is a kind of a roll printing method in which a pattern formed on a printing plate is formed on a photoresist applied to a roll and then transferred to a thin film transistor array substrate or a color filter array substrate on which a pattern is to be formed. ) Has been proposed.

The reverse offset printing method forms a pattern by coating ink on a blanket roll, removing unnecessary parts by a convex pattern of a printing plate, and then transferring the set to a substrate. In order to increase the viscosity of the coated ink in the reverse offset printing method to maintain a constant value, a method such as natural drying, blowing drying, hot air drying is used.

On the other hand, in the reverse offset method used in the conventional flat panel display device, the ink and the blanket is made of a material that does not include a tacky tacky characteristic. The ink is composed of a metal ink, and the blanket is composed of a cushion layer including polydimethylsiloxane (PDMS).

As a result, when the convex pattern of the printing plate is transferred to the substrate, unnecessary residual film is continuously generated or a part of the pattern moves to the printing plate, thereby causing a problem in that a desired pattern cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing blanket capable of minimizing a desired pattern defect and forming a desired pattern by attaching a material having a tacky property to a printing blanket.

The blanket for printing according to an embodiment of the present invention is a cushion layer made of silicone rubber, a support layer laminated on top of the cushion layer to suppress uneven stretching of the cushion layer and improving printing accuracy, and printing stacked on top of the support layer. And a printed layer comprising a sticky tackyfier resin material.

The blanket for printing according to the embodiment of the present invention may add a silica-based resin to improve its sticky tacky property to improve adhesion to ink, thereby minimizing pattern defects and forming a desired pattern.

1 is a view showing a pattern forming apparatus having a blanket for printing according to an embodiment of the present invention and a pattern forming method using the same.
FIG. 2 is a cross-sectional view of the blanket for printing of FIG. 1. FIG.
Figure 3 (A) is a graph showing the absorption rate of the ink coated on the conventional printing blanket over time, Figure 3 (B) is a graph showing the absorption rate of the ink coated on the printing blanket of the present invention over time. .

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing a pattern forming apparatus having a blanket for printing according to an embodiment of the present invention and a pattern forming method using the same.

As shown in FIG. 1, the pattern forming apparatus includes a blanket roll 110, a slit coater 120, a printing plate 140, and a transfer substrate 150.

The blanket roll 110 includes a rotatable roll frame 112 and a blanket 114 surrounding the roll frame 112 and providing an ink 102 coating surface according to the rotation of the roll frame 112. The roll frame 112 may be made of a metal material.

The slit coater 120 is a device for injecting the ink 102 to the blanket 114, is disposed spaced apart from the blanket 114 in consideration of the thickness of the ink. The slit coater 120 has a surface facing the blanket 114 has a predetermined area, and has a length extending in one direction. In addition, the nozzle of the slit coder 120 from which the ink 102 is sprayed is formed to have a slit shape having a fine width and long in one direction corresponding to the length of the slit coater 120.

Ink 102 ejected from the fine slits of the slit coater 120 is attached to the blanket 114 by the surface tension between each other to maintain a constant height without falling.

The ink 102 sprayed from the slit coater 120 includes a solvent for maintaining a viscosity at 2 to 10 cps during coating. The solvent serves to maintain the viscosity at 2 to 10cp during coating to enable nozzle coating if the solvent has a relatively low vaporization point. In addition, the ink 102 may be composed of a metal-based ink.

The printing plate 140 is for patterning the ink 102 coated on the surface of the blanket roll 110 with an appropriate viscosity for offset, and a plurality of convex portions 142a and a plurality of concave portions 142b. Equipped. The ink 102 coated on the surface of the blanket roll 110 is transferred to the plurality of convex portions 142a, while the ink 102 coated on the surface of the blanket roll 110 is transferred to the concave portion 142b. It doesn't work.

Due to this property, when the blanket roll 110 coated with the ink 102 on the printing plate 140 is rotated, the ink on the blanket roll 110 corresponding to the convex portion 142a of the printing plate 140 during the rotation process ( 102 is removed to be transferred to the convex portion 142a of the printing plate 140. On the other hand, the ink 102 on the blanket roll 110 corresponding to the recess 142b of the printing plate 140 remains on the blanket roll 110 to form a desired pattern 104.

The transfer substrate 150 is an object to be attached for transferring the ink pattern 104. When the blanket roll 110 on which the ink pattern 104 is formed on the transfer substrate 150 is rotated at a constant speed and pressure, the ink pattern 105 is transferred onto the transfer substrate 150.

The blanket 114 of the blanket roll 110 has a transparent material, and specifically, as shown in FIG. 2, a polydimethylsiloxane (PDMS, PDMS, hereinafter) PDMS layer coated with ink 102 is disposed on the top layer. Layer 114c, a support layer 114b for supporting the PDMS layer 114c, and a cushion layer 114a that relieves pressure and serves as a pressure distribution.

The cushion layer 114a may be made of silicone rubber, and foamed particles may be added to increase cushioning.

The support layer 114b is a PDMS layer 114c of the blanket 114 and may be made of a material having a small elasticity and bendable enough to be mounted on the roll frame 112. It is used as the support layer 114b is a polymer film such as polyethylene terephthalate (PET), polycarbonate (PC), or a metal thin plate such as aluminum, stainless steel (stainless), etc. Among them, preferred examples are polyethylene terephthalate ( PET).

The PDMS layer 114c serves to transfer ink onto the surface of the blanket 114 and transfer the ink. The PDMS layer 114c may mainly control physical properties among the cushion layer 114a and the support layer 114b.

Unit material Ingredient ratio Polymer 50 to 55% Resin 25 to 35% Tackyfier Resin 7 to 13% Catalyst 0.5 to 1.5% Cross-linker 2 to 7% Inhibitor <2%

As shown in Table 1, the PDMS layer 114c comprises 50-55% of the polymer, 25-35% of the resin, and 0.5-35% of the catalyst. 1.5%, cross-linker accounts for 2-7%, inhibitors account for less than 2%, and Tackyfier Resin accounts for 7-13%.

The Tackyfier Resin includes a silica resin-based material, and the silica resin series includes trimethylated silica.

As the Tackyfier Resin is added to the PDMS layer 114c, a polymer, which is a main component, may be reduced to improve absorption of the ink 102 coated on the PDMS layer 114c.

In addition, Tackyfier Resin attached to the PDMS layer 114c adds a tacky property to the PDMS layer 114c to provide adhesion between the blanket 114 and the ink 102 coated on the blanket 114. improve adhesion At this time, the component ratio of the Tackyfier Resin is adjusted such that the adhesion between the ink 102 and the blanket 114 is greater than the cohesion in the ink 102.

Accordingly, as the adhesion between the ink 102 and the blanket 114 is improved, the ink 102 coated on the blanket 114 is minimized by minimizing the influence of the cohesive force in the ink 102. When rotating the printing plate 140 may be patterned in a desired pattern on the printing plate 140.

Figure 3 (A) is a graph showing the absorption rate of the ink coated on the conventional printing blanket over time, Figure 3 (B) is a graph showing the absorption rate of the ink coated on the printing blanket of the present invention over time. .

As shown in Fig. 3A, the absorbance of the ink coated on the conventional printing blanket was measured to be 17.58% after 30 minutes. This absorption rate means that the ink does not penetrate into the PDMS layer of the conventional printing blanket, so that a dewetting phenomenon occurs. In this case, when the ink coated on the conventional printing blanket is transferred to the printing plate, unnecessary residual film may be generated on the blanket or the printing plate.

As shown in FIG. 3B, the absorption rate of the ink coated on the blanket to which Tackyfier Resin of silica resin series was added as in the present invention was measured to be 23.53% after 30 minutes. Therefore, the probability that the ink coated on the blanket penetrates into the PDMS layer of the printing blanket becomes higher than in the conventional case, so that the present invention can suppress the dewetting phenomenon. By suppressing this dewetting phenomenon, it is possible to minimize the generation of unnecessary residual film on the blanket or the printing plate when the ink coated on the printing blanket of the present invention is transferred to the printing plate.

102: Ink 104: Ink pattern
110: Blanket roll 112: Roll frame
114: Blanket 114a: Cushion layer
114b: support layer 114c: PDMS layer
120: slit coater 140: printing plate
142a: convex portion 142b: concave portion
150: blood transfer substrate

Claims (7)

A cushion layer made of silicone rubber;
A support layer laminated on the cushion layer to suppress uneven stretching of the cushion layer and improve printing accuracy; And
And a printed layer stacked on the support layer.
And said print layer comprises a sticky tackyfier resin material. The method according to claim 1,
The tackyfier resin is a blanket for printing, characterized in that the silica (silica) resin-based material. The method of claim 2,
The silica resin-based material is a printing blanket, characterized in that it comprises trimethylated silica (Trimethylated silica). The method of claim 2,
The silica resin-based material is a blanket for printing, characterized in that occupies about 7 to 13% of the components constituting the printing layer. The method according to claim 1,
The printing layer is a blanket for printing, characterized in that it comprises polydimethylsiloxane (PDMS, polydimethylsiloxane). The method of claim 5,
The PDMS is a blanket for printing, comprising a polymer, a resin, a catalyst, a cross-linker and an inhibitor. The method according to claim 1,
The support layer is a blanket for printing, characterized in that consisting of any one of a polymer film, such as polyethylene terephthalate (PET), polycarbonate (PC) or a thin metal plate of aluminum (aluminium), stainless steel (stainless).

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