KR20110004739A - Blanket for reverse off-set printing, and method of manufacturing the same - Google Patents

Abstract

PURPOSE: A blanket for reverse off-set printing, and a method of manufacturing the same are provided to save cost and improve the manufacturing speed but requires the good quality of blanket for obtaining precise pattern. CONSTITUTION: A blanket for reverse off-set printing, and a method of manufacturing the same includes a surface printing layer, a support layer and a cushioning layer. The surface printing layer has a thickness uniformity under 30μm and has hardness over 35 based on shore A. Silicon oil of low molecular weight is included. The coating pressure margin of a printing blanket is over 50μm.

Description

BLANKET FOR REVERSE OFF-SET PRINTING, AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a reverse offset printing blanket and a method of manufacturing the same.

In general, electronic devices such as liquid crystal display devices and semiconductor devices are fabricated by forming a pattern of numerous layers on a substrate. In order to form such a pattern, a photolithography process has been mainly used until now.

However, the photolithography process has to produce a predetermined pattern mask, and the chemical etching and stripping processes have to be repeated, thus making the manufacturing process complicated and generating a large amount of chemical waste harmful to the environment. This, in turn, leads to an increase in manufacturing costs, which reduces the competitiveness of the product.

A roll printing method using a printing roll has been proposed as a new pattern forming method for solving the disadvantages of the photolithography process.

There are various methods of roll printing, but it can be roughly divided into two types, gravure printing and reverse offset printing.

Gravure printing is a printing method that scrapes excess ink by printing ink on a concave plate and prints it. It is known as a method suitable for printing in various fields such as publishing, packaging, cellophane, vinyl, polyethylene, and the like. Research has been made to apply the gravure printing method to the fabrication of the active element or circuit pattern to be applied.

Since gravure printing transfers ink onto a substrate using a transfer roll, by using a transfer roll corresponding to the area of a desired display element, a pattern can be formed by one transfer even in a large-area display element. Will be. Such gravure printing not only forms an ink pattern for resist on a substrate, but also various patterns of the display device, for example, a TFT for gate lines and data lines, pixel electrodes, and capacitors connected to the TFT as well as a liquid crystal display device. It can be used to pattern metal patterns.

However, the blanket used for gravure printing is generally manufactured by casting a silicone-based resin into a rigid master mold. Thus, the blanket thus prepared is not only limited in manufacturing a uniform thickness, but also difficult to mass-produce on a pilot scale. have.

Thus, a reverse offset printing method is mainly employed for precise fine pattern formation.

For the prior art related to the reverse offset printing method and the printing apparatus, reference may be made to those of Documents 1 to 3, which are filed and published by the applicant of the present invention.

Document 1 is a printing roll; And a linear motor for moving in the front-rear direction while rotating the printing roll. The apparatus, by using a linear motor as a motor for driving printing rolls for coating and transfer, can minimize vibrations from the existing motors and provide a clean pattern without stains caused by vibrations.

Document 2 discloses a printing roll for a roll printing apparatus, and relates to a printing roll for a roll printing apparatus, characterized in that the cross-sectional area is reduced from the central region to both end regions.

Document 3 is a substrate; A substrate transfer device on which the substrate is mounted and which moves the substrate in one linear direction; A cliché disposed to face the plate surface of the substrate transfer device and having a pattern portion; A cliché on which the cliché is mounted so that the pattern portion of the cliché faces the plate surface of the substrate transfer device and moves the cliché in a straight line opposite the substrate transfer direction; A printing roll installed between the cliché feeder and the substrate feeder so as to be rotatable in the same direction as the cliché feed direction; And a coater for coating a coating on the printing roll, wherein the distance from the leading end of each of the substrate and the cliché to the central axis of the printing roll perpendicular to the linear direction is different from each other. In the initial positions of the substrate and the cliché spaced on both sides around the roll, the substrate and the cliché are linearly moved in opposite directions toward the printing roll on both sides of the printing roll at the same time as the printing roll is rotated. The coating is coated on the printing roll by the coater, and as the cliché passes over the rotating printing roll, the coating of the printing roll is transferred to the pattern portion of the cliché, and the printing roll is rotating on the printing roll. The process of transferring the coating pattern remaining on the printing roll to the substrate as the substrate passes by It discloses that on the roll printing device according to claim.

Document 1 KR 10-2008-0090890 (published) 2008.10.09.

Document 2 KR 10-2009-0020076 (published) 2009.02.26.

Document 3 KR 10-2009-0003883 (published) 2009.01.12.

All of the contents of the specification of Documents 1 to 3 are incorporated into the specification of the present invention as a description of the prior art of the present invention.

Fig. 1 shows a structural cross section of a blanket used for reverse offset printing. As shown in Figure 1, a conventional blanket is composed of a surface printing layer, a support layer, a cushion layer, may be further provided with a primer layer to secure the adhesion between the layers. The surface print layer is a layer in which ink is directly buried and is transferred, and is mainly made of poly-di-methyl-siloxane (PDMS). The support layer serves to support the surface print layer and the cushion layer, and is mainly a PET film. Is produced by. In addition, the cushion layer, when the surface of the surface printing layer is not uniform, serves to compensate for such a thickness difference, and is mainly made of PDMS like the surface printing layer.

On the other hand, the prior art for producing a blanket for printing used in the reverse offset process will be described. 2A to 2B are diagrams schematically showing a conventional process of manufacturing a blanket for printing, which will be described with reference to this.

Figure 2a schematically shows a conventional blanket manufacturing process of the simplest form. As shown in FIG. 2A, a mold 50 having a recess 55 having a predetermined shape is prepared, the resin material 35 for the blanket is filled in the recess 55 of the mold 50, and then the pressurizing device 60 is provided. Press to make a blanket.

However, when the blanket is manufactured using the mold 50 and the pressurizing device 60 as described above, the precision of the recess 55 may be reduced or the pressure uniformity of the pressurizing device 60 may be degraded when the mold 50 is manufactured. In this case, there is a problem that the blanket is not manufactured precisely in the desired shape. If the blanket is not manufactured precisely as described above, there is a fear that an unwanted pattern is formed in the process of transferring the to-be-printed material on the blanket.

2B is a diagram schematically illustrating a process of manufacturing another conventional blanket. The process shown in FIG. 2B is invented to solve the problems of the technique shown in FIG. 2A and has been registered with the Korean Patent Office (registered KR 10-0617042). ).

As shown in FIG. 2B, a conventional blanket manufacturing apparatus includes a container 100, a preheating equipment 200, a rotary roll 300, and a curing equipment 400. The container 100 receives the blanket material 350 and serves to drop the received blanket material 350. The container 100 includes a body part 120 and a nozzle part 140, and includes a blanket material. An accommodating groove for accommodating the 350 is formed in the body portion 120, and a slit for connecting the accommodating groove to drop the blanket material 350 is formed in the nozzle portion 140.

According to the prior art of Figure 2b, by forming the blanket while dropping the blanket material in the container there is an advantage that a uniform blanket can be produced without being affected by the precision of the mold as shown in Figure 2a or the pressure uniformity of the pressure device.

However, in the prior art of FIG. 2, when the viscosity of the blanket material is too high, the flowability is not good to secure thickness uniformity. On the contrary, when the viscosity is low, the flowability is too good to drop down the roll. As a result, it may not be excellent in terms of improving uniformity.

Reverse offset printing is a very popular technique in terms of cost reduction and production speed in pattern formation, but a high quality blanket is required to obtain a precise pattern. That is, manufacturing a high quality blanket for printing is a very important technical problem in that the quality of the pattern may depend on the characteristics of the blanket.

In order to produce a blanket of good quality, the problem is a) the uniformity of the thickness of the blanket, b) the hardness of the surface printing layer, c) the presence of foreign matter (bubbles, dust, etc.) in the blanket, d) the base layer (substrate film). E) adhesion between the layer and other layers, e) the content of the low molecular weight silicone oil contained in the surface printing layer.

In particular, since the reverse offset process is a micro process that must transfer a sub-micrometer size pattern over a large area, the blanket used therein is more required to be uniform over a large area. That is, the blanket for fine pattern printing should have a uniform thickness throughout the entire printing area to enable similar pattern printing in all areas. If thickness uniformity is not maintained during reverse off-set printing, the wet thickness of the ink coated from the slot die becomes uneven and the drying time of the ink due to the difference in the wet thickness is different. When the cliché is off, the unnecessary portion of the entire area cannot be removed evenly. In addition, a region in which the pattern is not transferred may also occur in a set process in which the pattern is transferred from the blanket.

Accordingly, the present invention is to provide a printing blanket manufacturing method capable of forming an excellent pattern with excellent thickness uniformity but no residue. That is, ① the surface printing layer is cured at room temperature to minimize the loss of the content of low molecular weight silicone oil, ② the high viscosity silicone resin is used to improve the thickness uniformity of the surface printing layer, ③ the curing agent in the composition to form the surface printing layer By adding an appropriate amount or thermosetting the surface printed layer within the limit temperature range to improve the hardness of the surface printed layer, to provide a high quality printing blanket and a method thereof.

The present invention has been made to solve the above problems of the prior art,

A printing blanket comprising a surface printing layer, a support layer, and a cushion layer, wherein the surface printing layer has a thickness uniformity of less than 30 µm, a hardness of 35 or more on a shore A basis, and contains a low molecular weight silicone oil. It provides a printing blanket, characterized in that.

In the present invention, the printing blanket provides a printing blanket, characterized in that the pressure margin is 50 ㎛ or more.

In addition, in the printing blanket manufacturing method comprising a surface printing layer, a support layer, and a cushion layer,

Forming a cushion layer on one surface of the base film as the support layer; And

Forming a surface printing layer on one surface opposite to the base film,

Forming the surface printed layer provides a printing blanket manufacturing method, characterized in that to cure the silicone resin at 90 ℃ or less.

In addition, in the manufacturing method of the present invention, the step of forming the surface printing layer provides a printing blanket manufacturing method, characterized in that to cure the silicone resin at room temperature.

In addition, in the production method of the present invention, the curing time provides a printing blanket manufacturing method, characterized in that 12 hours or more.

In addition, in the manufacturing method of the present invention, the silicone resin provides a printing blanket manufacturing method, characterized in that the viscosity is within the range of 20,000 ~ 120,000 cP.

In addition, in the manufacturing method of the present invention, the silicone resin provides a printing blanket manufacturing method characterized in that it comprises a curing agent within the range of 3 to 25 parts by weight relative to 100 parts by weight of the silicone monomer.

In addition, in the manufacturing method of the present invention, the step of forming the surface printing layer, provides a printing blanket manufacturing method, characterized in that after the thermosetting of the silicone resin, and further heat curing it again.

In addition, in the manufacturing method of the present invention, the forming of the surface printing layer provides a printing blanket manufacturing method, characterized in that after the step of forming the cushion layer.

The blanket produced by the method of the present invention is excellent in thickness uniformity and can give a high pull pressure margin, and has the effect of obtaining a clean pattern free of residue during printing.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention,

A printing blanket comprising a surface printing layer, a support layer, and a cushion layer, wherein the surface printing layer has a thickness uniformity of less than 30 µm, a hardness of 35 or more on a shore A basis, and contains a low molecular weight silicone oil. It relates to a printing blanket, characterized in that.

First, the terms used in the present invention are defined.

The thickness uniformity means a thickness deviation between the maximum thickness value and the minimum thickness value.

In addition, "shore A" mainly refers to the method and unit for measuring the hardness, which is obvious to those skilled in the art.

In addition, the low molecular weight silicone oil is a silicone oil having a molecular weight of 1000 or less, examples of such silicone oil, [SiO (CH ₃ ) ₂ ] ₅ , Si ₅ O ₄ (CH ₃ ) ₁₂ , [SiO (CH ₃ ) ₂ ] ₆ , [SiO (CH ₃ ) ₂ ] ₇ , Si ₈ O ₇ (CH ₃ ) ₁₈ , [SiO (CH ₃ ) ₂ ] ₈ , [SiO (CH ₃ ) ₂ ] ₉ , [SiO (CH ₃ ) ₂ ] ₁₀ and the like.

The printing blanket of the present invention described above,

In the printing blanket manufacturing method comprising a surface printing layer, a support layer, and a cushion layer,

Forming a cushion layer on one surface of the base film as the support layer; And

Forming a surface printing layer on one surface opposite to the base film,

Forming the surface printed layer may be prepared by a printing blanket manufacturing method, characterized in that to cure the silicone resin at 90 ℃ or less.

In the present invention, the term 'silicone resin' does not mean pure silicon monomer, but generally includes various components (eg, silicone oil) that may be included in the silicone resin. However, of course, the silicon monomer should be the main component (the meaning of the 'main component' refers to one component that occupies the highest content among various mixed components).

In the present invention, the step of forming the surface printing layer is characterized in that the silicone resin is cured at 90 ℃ or less. In particular, the silicone resin is more preferably at room temperature. Referring to the advantages obtained by curing the surface printed layer at room temperature as follows.

Typically, the silicone resin contains a small amount of silicone oil in addition to the silicone monomer component to be polymerized. When the silicone oil is contained in an appropriate amount, the wettability with the ink is improved and the drying speed of the ink is controlled. There is. Initially, the silicone oil is partially contained in the silicone resin, but the silicone oil has a high volatility, so that it may not exist in the silicone resin when exposed to heat for a long time.

Table 1 below analyzes the composition and content of the volatile volatilized when the printing blanket cured by the purge & trap GC mass method according to the temperature and time.

As shown in Table 1, it can be seen that the higher the curing temperature, the higher the volatilization amount of the low molecular weight silicone oil.

When the silicone oil is volatilized, the absorption speed of the ink is increased in the actual roll printing process, and thus the swelling speed of the blanket is also increased, and the drying speed of the ink is also increased. In this case, even when coated with the same wet thickness, the offset (off-set) in the printing process is less than that in the presence of silicone oil. In addition, when the wet thickness of the ink is increased, the unnecessary parts may not be neatly removed at the time of the cliché off, and the residue may remain as an impurity to obtain a desired pattern.

Accordingly, when the composition is cured at a relatively low temperature of 90 ° C. or less, it is possible to minimize volatilization of the silicone oil and to secure an excellent surface printing layer. From this point of view, it is more preferable to cure the composition at room temperature.

In particular, in the present invention, the silicone resin preferably has a viscosity within the range of 20,000 ~ 120,000 cP.

The thickness uniformity of the printing blanket is an important factor in determining the performance of the printing blanket. In the present invention, in order to secure the thickness uniformity of the blanket, a high viscosity resin having a viscosity of 20,000 to 120,000 centiposie (cP) in the silicone resin coating is used. This is to minimize the flow of resin that may occur during curing after coating. In particular, the silicone resin preferably used in the present invention is a thermosetting type (silicone resin can be divided into ultraviolet curing type, thermosetting type, room temperature curing type, etc., depending on the curing method, the silicone resin of the present invention is not limited to all of these When the thermosetting silicone resin is cured at room temperature for at least 12 hours, the resin may run out while curing the low viscosity silicone resin, thereby making it difficult to match the thickness uniformity. .

In the present invention, the silicone resin preferably contains a curing agent within the range of 3 to 25 parts by weight with respect to 100 parts by weight of the silicone monomer. When the curing agent is added in an amount less than 3 parts by weight, the hardness value of the surface printed layer may be lowered, and at the same time, a problem may occur that the stickiness of the surface of the printed layer is increased due to the low degree of curing (that is, the surface may be gel). To form a phase-like surface).

This is because the surface print layer of the printing blanket should have a hardness of about 35 or more on the shore A basis so that the sharpness and bottom contact of the printing pattern may be alleviated during printing. In general, the higher the hardness, the better the printing characteristics. (In this respect, the curing agent is not particularly limited, but it is preferable to use one having a high degree of crosslinking at the time of curing).

However, the higher the content of the curing agent has the advantage that the hardness value can be increased at a shorter time and at a lower temperature, but due to the faster curing speed as the content of the curing agent increases, the fine bubbles generated during the mixing of high-viscosity silicone resin cannot be lifted to the surface. There exists a possibility that the problem which hardens | cures is left as it is in a blanket inside. Therefore, it is preferable that the content of the curing agent does not exceed 25 parts by weight.

In order to improve the hardness of the surface printed layer, after curing the silicone resin at room temperature, the step of thermosetting it may be further added. When the silicone resin is thermally cured, the hardness is higher than that at room temperature. However, since the thermosetting step may volatilize the silicone oil, it is preferable to perform the temperature within 90 ° C. or less, and more preferably within the temperature of 70 ° C. or less.

In the present invention, the step of forming the cushion layer is preferably made before the step of forming the surface printing layer. The blanket can also be fabricated by forming the surface print layer first and then the cushion layer later, but if the cushion layer is formed first, the cushion layer is located on the lower surface when the surface print layer is formed later. Since there is an effect of alleviating the thickness variation of the, as a result there is an advantage that can help to improve the thickness uniformity of the surface printed layer.

Hereinafter, the manufacturing method of the present invention will be described in more detail in the step of forming each layer of the blanket of the present invention.

First, a base film to be used for the printing blanket is prepared. As the base film, it is preferable to use a film having a small stretch in order to suppress the stretching of the surface printing layer and the cushion layer and to improve the accuracy of printing. In particular, a film of a resin having a tensile modulus of at least 1000 MPa at room temperature, particularly 2000 to 5000 MPa, is suitable. Examples of such films include polyester films such as polyethylene terephthalate (PET), polycarbonate films, and the like.

Although the thickness of a base film is not restrict | limited, It is suitable that it is 0.1-0.5 mm, and 0.2-0.45 mm is preferable. When the thickness of the base film is less than the above range, the effect of reinforcing and supporting the cushion layer or the surface printed layer by the base material may be insufficient. In addition, as the thickness of the film is thinner, the adhesion with the surface plate becomes more difficult, and is more susceptible to wrinkles caused by the film itself, and thus there is a problem that it is difficult to improve the thickness uniformity.

On the contrary, when the thickness of the base film exceeds the above range, the thickness of the blanket itself layer becomes too thick, and when the blanket is wound on the printing roll, there is a problem that the adhesion with the printing roll may be degraded.

Next, a liquid mixture for forming a cushion layer provided on one side of the substrate is prepared. The mixture is prepared by blending the liquid silicone resin and the hollow microspheres, and mixing the hollow microspheres to be uniformly dispersed in the liquid silicone resin.

The hollow microspheres are not particularly limited and may be those disclosed in US Pat. No. 4,770,928 or the like. In particular, when considering the swelling prevention by ink, homopolymers of polymerizable monomers such as polymerizable monomers such as vinylidene chloride, (meth) acrylonitrile, or monomers thereof Hollow microspheres in which the shell is formed of a copolymer containing two or more kinds are preferable.

The hollow microspheres are filled with gas such as iso-octane, iso-pentane, and iso-butane and are empty even at room temperature, and maintain the spherical shape to act as a cushion. What can be used was used.

Although the particle size of a hollow microsphere is not specifically limited, In order to exhibit the effect of adjusting the phosphorus pressure by a cushion layer favorably, it is preferable that the average particle diameter is 20-200 micrometers, especially 40-150 micrometers.

The hollow microspheres are suitably blended in an amount of 1 to 30 parts by weight based on 100 parts by weight of the liquid silicone resin. If the blending ratio of the hollow microspheres is less than this range, the effect of adjusting the pressure by the cushion layer is not obtained. In addition, when the blending ratio of the hollow microspheres exceeds this range, the cushioning layer becomes soft, the printing accuracy is lowered, and the viscosity of the mixture is high, which makes it impossible to uniformly apply the mixture to a desired thickness.

Next, at the same time, the mixture is applied to one surface of the substrate, and the mixture containing the silicone resin and the hollow microspheres is cured at room temperature to form a cushion layer while the substrate is kept horizontal. In this way, when curing at room temperature, the mixture is uniformly formed and cured by its own weight, and at the same time, the hollow microspheres have a gradient in the thickness direction.

In order to apply the mixture to one surface of the substrate, a roll coater, bar coater, flow coater, gravure coater, spray, applicator, or the like may be used. In addition, the substrate is preferably in a state where the horizontal is completely maintained, it is preferable that the substrate film is in close contact with the horizontal object.

The silicone resin may be thermosetting, room temperature curing, catalytic curing, or the like. After the mixture is applied, the mixture is allowed to stand for a certain period of time under heating (23 ± 3 ° C.) without heating and cured.

The thickness of the cushion layer is not particularly limited, but is preferably 0.05 to 2 mm, more preferably 0.3 to 1 mm. If the thickness of the cushion layer is less than this range, there may be a possibility that the pressure control effect of the cushion layer may not be sufficiently obtained. If the thickness of the cushion layer is exceeded, the thickness of the base film may be relatively small. There is concern.

Next, the base film is inverted in order to form a surface print layer on the other side of the base film.

The surface printing layer is a non-porous layer unlike the cushion layer. Such a surface printing layer can be formed by applying liquid silicone resin to the opposite surface of the substrate and curing the liquid silicone resin at room temperature while keeping the substrate horizontal.

Although the thickness of the said surface printing layer is not limited to this, 0.01-1.2 mm is preferable and it is more preferable that it is 0.1-1 mm. In order to form the surface printed layer having a thickness less than this range, the application amount of the liquid silicone resin must be made in a very small amount, which is undesirable because there is a possibility that the leveling property is lowered and the uniformity of the thickness of the surface printed layer may be impaired. . Moreover, when thickness exceeds this range, there exists a possibility that the effect of adjusting the pressure by a cushion layer may not fully be acquired.

It is preferable that the total thickness of the printing blanket which has each said layer is 0.7-3 mm, and it is more preferable that it is 0.9-2 mm. It is because it is necessary to match the total thickness of a blanket, in order to match the precision of a printing pattern, and to fully adhere to a printing roll without the tension of a blanket. When the total thickness of the blanket including the printing layer or the cushion layer is thicker than the thickness within the above range, the size and positional accuracy of the pattern are inferior, and adhesion to the printing roll is poor, so that precise printing is difficult. On the contrary, when it is thinner than the thickness within the above range, it is difficult to compensate for the thickness variation of the blanket (particularly when the cushion layer is thin) and it is difficult to control the swelling property of the ink (particularly when the thickness of the printing layer is thin).

A primer layer may be formed between the substrate and the layers to increase adhesion and integrity between the substrate and the layers. The primer layer may be formed in any thickness to suit the purpose without limitation. The material of a primer layer can be used as what contains a silane coupling agent with favorable affinity with silicone resin. In the case of forming the cushion layer and the surface printing layer without the primer layer, the surface of the substrate is physically or chemically treated to give affinity for the silicone resin and to apply the mixture to one side of the substrate to secure the adhesion to the substrate. It is preferable.

The printing blanket manufactured according to the manufacturing method of the present invention can be used for reverse offset printing. The printing blanket manufactured by the manufacturing method of this invention has uniform thickness uniformity (less than 30 micrometers), a pressure margin of 50 micrometers or more is possible, and hardness is high and it is possible to perform favorable printing.

Hereinafter, the present invention will be described in more detail with reference to Examples. Embodiments herein are for the purpose of describing the invention only and are not intended to limit the scope of the invention.

Example

100 parts by weight of liquid silicone resin (KE1606, viscosity 50,000 cP manufactured by Shin-Etsu Silicone Co., Ltd.), 1 part by weight of hollow microspheres (920 DET 80 d20, manufactured by EXPANCEL), mixed and uniformly dispersed, and then 10 parts by weight of a curing agent are further added to the cushion layer. The formation mixture was prepared.

Next, a tensile force was applied to the polyethylene terephthalate (PET) substrate film having a thickness of about 0.35 mm on the surface plate maintained in a horizontal manner, and then the tensile force was applied to the surface plate.

Before forming a cushion layer on the PET base film, a primer was coated. Primer was used X-33-312 of shinetsu, the coating wet thickness (wet thickness) was less than about 15 ㎛, the primer solvent was volatilized for 30 minutes or more at room temperature.

Thereafter, the cushion layer forming mixture was evenly applied to one surface of the substrate surface using an applicator in an area of about 120 cm × 150 cm. This was cured at room temperature (23 ± 3 ° C.) for about 3 days to form a cushion layer having a thickness of 0.9 mm.

Next, while maintaining the state in which the base film is in close contact with the surface of the surface plate, the slip coating liquid was bar-coated on the surface of the cushion layer to form a slip coating layer. The slip coating solution was prepared by mixing silicone resin, silicone oil, low molecular weight siloxane substituted terminal hydrogen, and silica particles.

The slip coating liquid was applied using a spray and dried at room temperature for 1 hour to form a slip coating layer having a thickness of about 5 μm.

Subsequently, the base film was inverted and one side of the opposite side of the base film was placed upward, and then a tensile force was applied to the base film by the same method as described above, and then completely adhered to the surface plate.

100 weight part of liquid silicone resin (KE1606 by a Shin-Etsu Silicone company, viscosity 50,000cP), and 10 weight part of hardening | curing agents were mixed and uniformly disperse | distributed, and the surface printing layer formation mixture was prepared.

Thereafter, the surface printing layer-forming mixture was evenly applied to the remaining surface of the substrate surface using an applicator in an area of about 120 cm × 150 cm. This was cured at room temperature (23 ± 3 ° C.) for about 3 days to form a surface printed layer with a thickness of 0.4 mm to finally complete the printing blanket.

Comparative example

In the step of forming the surface printed layer, except that the silicone resin was cured at high temperature (100 ± 3 ° C.) without curing at room temperature, all of the printing blankets were prepared under the same conditions as in the above examples.

Thickness uniformity measurement

Thickness uniformity was measured by LVDT (linear variable differential transformer, manufactured by Dongdo Tech Co., Ltd.). Using the LVDT touch probe, the thickness uniformity was measured by the connection method. The distance detected by the probe was 5 cm × 7 cm and the error deviation was 5 μm.

When the blanket of 1000 mm x 1000 mm size was manufactured in FIG. 3, the thickness uniformity measurement result of the printed layer of an Example is shown.

As shown in FIG. 3, it can be seen that the thickness uniformity is greatly improved to 20 to 30 μm by having a very precise thickness range of 785 to 815 μm.

[Pattern Shape Measurement]

As a result of observing the pattern shape of the embodiment, it was confirmed that there were no poor printing phenomena such as bottom contact phenomenon, pattern aggregation phenomenon in which the line width of the pattern became thinner than the cliché, and tail curl phenomenon in which the tail portion of the pattern was curled to lengthen longer than the cliché. Can be.

In addition, as a result of observing the pattern shape of the comparative example, residues remained on the surface of the pattern, which was not a neat printing pattern. The bad result of the pattern result shown in the comparative example is that, due to the volatilization of low molecular weight oils during thermal curing, the wettability of the ink of the blanket becomes low, and the drying time after the ink coating is also shortened, so that the cliché off It is presumed to have occurred because the (cliche off) process and the glass (set) process did not occur properly.

1 is a structural cross-sectional view of a blanket used for reverse offset printing.

2A to 2B are schematic diagrams showing a step of manufacturing a conventional blanket.

Figure 3 shows the result of measuring the thickness uniformity of the printed layer of the embodiment.

Claims (9)

A printing blanket comprising a surface printing layer, a support layer, and a cushion layer, wherein the surface printing layer has a thickness uniformity of less than 30 µm, a hardness of 35 or more on a shore A basis, and contains a low molecular weight silicone oil. Printing blanket. The printing blanket of claim 1 wherein the pressure margin of the printing blanket is at least 50 μm. In the printing blanket manufacturing method comprising a surface printing layer, a support layer, and a cushion layer, Forming a cushion layer on one surface of the base film as the support layer; And Forming a surface printing layer on one surface opposite to the base film, Forming the surface printed layer is a printing blanket manufacturing method, characterized in that for curing the silicone resin at 90 ℃ or less. The method of claim 3, wherein the forming of the surface printing layer comprises curing the silicone resin at room temperature. The method of claim 3, wherein the curing time is 12 hours or more. The method of claim 3, wherein the silicone resin has a viscosity in the range of 20,000 to 120,000 cP. The method of claim 3, wherein the silicone resin comprises a curing agent within the range of 3 to 25 parts by weight based on 100 parts by weight of the silicone monomer. The method of claim 3, wherein the forming of the surface printed layer comprises curing the silicone resin at room temperature and then further thermosetting the silicone resin. The method of claim 3, wherein the forming of the surface printing layer is performed after the forming of the cushion layer.

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