KR101211748B1 - Blancket with improved slippage of cushion layer and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a blanket for printing and improved manufacturing method of the slip properties of the cushion layer, the cushion layer; A support layer laminated on the cushion layer; And a printing layer laminated on top of the support layer, wherein the cushion layer is formed with concavities and convexities at a lower portion thereof, thereby improving slip property of the silicone blanket cushion layer, and when mounted on a printing roll. Not only the tension can be easily adjusted, but also the friction during printing can be improved, so that the dispersion of stress can be improved, thereby improving the print quality of the final fine pattern.

Cushion layer, slip, blanket, friction, irregularities

Description

BLANKET WITH IMPROVED SLIPPAGE OF CUSHION LAYER AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a blanket for printing and improved manufacturing method of the slip layer of the cushion layer, and more particularly to a blanket manufacturing method for forming irregularities in the lower portion of the cushion layer in order to improve the slip properties of the cushion layer of the printing blanket. .

Slip of the cushion layer is required to maintain the proper tension on the main roll during reverse offset and gravure printing, and is required for the blanket. Due to the tacky of polydimethylsiloxane (PDMS), it causes uneven contact with the roll, which lowers the overall thickness uniformity of the blanket structure of the laminated structure, and deforms the fine pattern in the final printing so that good printing cannot be performed.

The present invention is to solve the above problems, by improving the slip properties of the silicone blanket cushion layer, not only easy to adjust the tension when mounted on the printing roll, but also less friction during printing to improve the dispersion of the stress to improve the final print quality It is an object to provide this improved blanket.

The present invention is to achieve the above object, a cushion layer; A support layer laminated on the cushion layer; And a printing layer laminated on the support layer, wherein the cushion layer provides a printing blanket, wherein irregularities are formed at a lower portion thereof.

In addition, the cushion layer is characterized in that the silicone rubber made of polydimethylsiloxane (PDMS, polydimethylsiloxane) as a base material.

In addition, it is characterized in that the foam particles in the form of hollow microspheres to form a porous layer on the cushion layer.

In addition, the support layer is characterized in that the polymer film selected from the group consisting of polyethylene terephthalate (PET) and polycarbonate (PC), or a metal sheet material selected from the group consisting of aluminum (aluminium) and stainless steel (stainless).

In addition, the printed layer is characterized in that the silicone rubber made of polydimethylsiloxane (PDMS, polydimethylsiloxane) as a base material.

In addition, the overall thickness of the blanket is characterized in that 0.5 ~ 2.0mm.

In addition, the present invention provides a method for producing a blanket for printing, wherein the cushion layer of the blanket for printing is coated on a master mold having surface irregularities and is cured, thereby forming irregularities in the cushion layer.

In addition, the degree of the unevenness is characterized in that the 10-point average roughness (Rz) value of 3 ~ 25㎛.

According to the present invention, by using the master mold having the surface irregularities formed on the cushion layer, the PDMS is coated and cured at room temperature, thereby improving the slip property through mold release to facilitate mounting of the blanket on the printing roll and improving the printing quality. You can.

The present invention cushion layer; A support layer laminated on the cushion layer; And a printing layer laminated on top of the support layer, wherein the cushion layer relates to a printing blanket, wherein irregularities are formed at a lower portion thereof.

Hereinafter, the present invention will be described in detail.

1 is a view showing the structure of a general printing blanket. The blanket used for micropattern printing generally consists of an outermost PDMS printed layer having a micropattern, a support layer serving to support it, and a cushion layer having a pressure distribution role to alleviate nip pressure.

The cushion layer used in the present invention uses a silicone rubber based on polydimethylsiloxane (PDMS, polydimethylsiloxane). In the present invention, to form the irregularities in the lower portion of the cushion layer to improve the slip property of the blanket, the method of forming the irregularities using wet etching (wet etching) or sandblasting (sandblasting).

The degree of unevenness may vary depending on the degree of glass etching, but the degree of unevenness is 3 to 25 μm as a 10-point average roughness (Rz) value. Here, the 10-point average roughness (Rz) value means the difference between the average height of the five highest peaks and the five deepest valleys in the cross-sectional curve. If the degree of concavities and convexities is less than 3 μm with a 10-point average roughness (Rz), it is not easy to work when the roll is mounted due to lack of slip property.

The cushion layer may be added to the foam particles in order to increase the feeling of cushioning, the foam particles are used that the inner hole is formed in the shell of the thermoplastic resin, the size of the particles is not particularly limited, but the effect of adjusting the pressure is good In order to exhibit, it is preferable to use 50-150 micrometers. By adding such foamed particles to the cushion layer, the in-pressure margin area of the blanket during printing, that is, the in-pressure range of uniform pattern printing, is further expanded and the durability of the surface printed layer of the blanket is also improved.

The support layer serves to improve printing accuracy by suppressing non-uniform stretching of the surface printing layer or cushion layer in the printing blanket, and is not particularly limited in the case where the elasticity is small and can be bent enough to be mounted on a roll. In the present invention, the support layer is a polymer film such as polyethylene terephthalate (PET) or polycarbonate (PC) or a metal thin plate such as aluminum or stainless steel, and a preferred example thereof is polyethylene terephthalate (PET) to be.

The printing layer serves to bury and transfer ink onto the surface of the blanket for printing, and examples of the printing layer may not be limited when only the uniform coating of the table surface and the conditions for transferring to the substrate are satisfied. What is used is silicone rubber based on PDMS, and it is preferable to use the 2-liquid type room temperature hardening type (RTV) liquid silicone rubber which does not generate gas at the time of hardening.

The overall thickness of the blanket with the above configuration is in the range of 0.5 to 2.0 mm. If the thickness of the blanket is less than 0.5mm, since the application amount of the liquid silicone rubber is small, the leveling property at the time of curing is not good, and the thickness uniformity is deteriorated.If the thickness of the blanket is more than 2mm, the blanket does not bend properly when the blanket is wound on the main roll. It is not desirable because there is concern .

The present invention also provides a method for producing a blanket for printing, wherein the cushion layer is coated on a master mold having surface irregularities and is cured, thereby forming irregularities in the cushion layer.

A method of forming irregularities in the cushion layer is shown in FIG. When the cushion layer is coated as shown in FIG. 2, liquid silicone rubber is poured on the surface using a master mold having surface irregularities to cure at room temperature, thereby replicating and forming fine irregularities.

Hereinafter, the present invention will be described using examples. The following examples are provided to illustrate the present invention, and the scope of the present invention includes the inventions described in the following claims and their substitutions and modifications within the equivalent ranges, and are not limited to the scope of the present examples. .

[Example]

Example 1

After coating and mixing liquid silicone rubber and foamed particles (1% or less) with the cushioning layer on the master mold having irregularities, the total blanket thickness is 1650 ± 10µm for 24 hours and the Rz of the uneven surface A blanket having a value (Mitutoyo Surftest SJ-301) of 5 ± 1 μm was obtained.

[Example 2]

After coating and mixing liquid silicone rubber and foamed particles (1% or less) with a cushion layer on a master mold having irregularities, the total blanket thickness is 1650 ± 10µm for 24 hours, and the Rz value of the uneven surface (Mitutoyo Co., Ltd. Surftest SJ-301) obtained a blanket of 15 ± 2 μm.

[Comparative Example]

A blanket was prepared in the same manner as in Example 1 except that no irregularities were formed in the cushion layer. The overall blanket thickness was 1650 ± 10 μm and the bottom surface Rz value (Mitutoyo Surftest SJ-301) showed 0.2 μm.

[Experimental Example]

Friose tester of Toyoseiki (JIS K7125, -P8147, ISO 8295) to measure the friction of the cushion layer is shown in Table 1 below. The sled used in the measurement was 1.96 N (200 g), and the friction coefficient μ was divided into the static friction coefficient (uS) and the motion friction coefficient (uD).

f = μN (f: friction, μ: friction coefficient, N: vertical drag)

uS uD Example 1 1.25 1.03 Example 2 0.72 0.67 Comparative example Not measurable Not measurable

As can be seen from Table 1, according to the embodiment of the present invention, it can be seen that the unevenness is improved by the friction coefficient lowered, thereby making it easier to mount the blanket on the printing roll and the printing quality is uniform.

1 is a view showing the structure of a general printing blanket.

2 is a schematic view showing a method of forming irregularities in a cushion layer.

Claims (8)

Cushion layer; A support layer laminated on the cushion layer; And In the blanket for printing comprising a printed layer laminated on top of the support layer, The cushion layer is made of a silicone rubber material based on polydimethylsiloxane (PDMS, polydimethylsiloxane), The cushion layer is formed by coating the silicone rubber material on a master mold having surface irregularities formed thereon, thereby forming irregularities in the lower portion of the cushion layer. A blanket for printing, characterized in that the degree of irregularities is 3 to 25 µm at a ten-point average roughness (Rz) value. delete delete The method of claim 1, Blanket for printing, characterized in that for mixing the foam layer in the form of hollow microspheres to form a porous layer on the cushion layer. The method of claim 1, The support layer is a blanket for printing, characterized in that the polymer film selected from the group consisting of polyethylene terephthalate (PET) and polycarbonate (PC), or a metal thin plate material selected from the group consisting of aluminum and stainless. The method of claim 1, The printing layer is a blanket for printing, characterized in that made of a silicone rubber material based on polydimethylsiloxane (PDMS, polydimethylsiloxane). The method of claim 1, The thickness of the blanket is a blanket for printing, characterized in that 0.5 ~ 2mm. delete

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