JP4661198B2 - Blanket for printing and manufacturing method thereof - Google Patents

Description

  The present invention relates to a printing blanket, and more particularly to a printing blanket suitable for high-definition printing.

  In recent years, the production of electronic parts using printing has been actively performed, but the demand for higher-definition printing is increasing. As a result, the demand for printing blankets is increasing. When a blanket is used and the blanket swells, the printing state changes, but conventionally, the setting of the printing press has been adjusted each time. However, when printing high-definition electronic components using a blanket, even a slight change in the blanket condition has a large effect on print quality, and it is difficult to continue printing under certain conditions. There was an important problem with sex.

As a method for solving such a problem, a method of performing a blanket drying operation at any time during printing has been proposed. However, it is difficult to determine the drying conditions to keep the blanket state constant, and even if the appropriate drying conditions are known, the influence of dimensional changes due to thermal expansion of the blanket and other members, and the surface tension changes due to heat, This causes problems such as changes in printability. Furthermore, if the treatment is not completed within a sufficiently short drying time, there is a problem in that it takes time and productivity is poor.
JP 2003-305821 A

  The present invention provides a printing blanket that improves blanket stability during printing by suppressing the amount of swelling of the blanket, and in particular, can improve productivity without degrading quality in high-definition printing. Let it be an issue.

According to the first aspect of the present invention, in the printing blanket in which the silicon rubber is arranged on the surface layer, a solvent barrier layer is provided under the surface layer silicon rubber, and the same rubber as the surface layer silicon rubber is further provided under the solvent barrier layer. A lower rubber layer having hardness is disposed, a base substrate is disposed under the lower rubber layer, and a cushion layer is further disposed under the base substrate ,
A printing blanket characterized in that the surface silicon rubber has a thickness of 0.2 mm or less, and the solvent barrier layer is a plastic film having a thickness of 100 μm or less .

The invention of claim 2 of the present invention is a printing blanket of claim 1, rubber hardness range of the surface layer silicone rubber is characterized in that 30 to 70.

The invention of claim 3 of the present invention is a printing blanket according to any one of claims 1-2, wherein the plastic film is characterized in that it is a PET film.

The invention of claim 4 of the present invention, the printing according to the surface layer of silicone rubber and preformed in a solvent barrier layer, any one of claims 1-3, characterized in that subsequently bonded to a lower rubber layer Blanket.

The invention of claim 5 of the present invention is the method for producing a printing blanket according to any one of claims 1 to 4 , wherein a surface layer silicon rubber is previously formed on the solvent barrier layer, Thereafter, the printing blanket is bonded to the lower rubber layer.

  The present invention is a printing blanket in which a solvent barrier layer is provided under the surface silicon rubber, and a lower layer rubber having a hardness within the rubber hardness range of the surface silicon rubber is disposed under the solvent barrier layer. The amount is suppressed, and the blanket stability during printing is improved. In particular, the printing blanket enables high-definition printing to improve productivity without degrading quality.

  In addition, the present invention is a manufacturing method in which surface silicon rubber is formed in advance on the solvent barrier layer and then bonded to the lower rubber layer, so that the printing blanket having a uniform film thickness can be easily manufactured. It becomes.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a cross-sectional view of one embodiment of a printing blanket according to the present invention. As shown in FIG. 1, in this printing blanket, a lower rubber layer 3, a solvent barrier layer 2, and a surface silicon rubber 1 are provided on one side of a base substrate 4, and a cushion layer 5 is provided on the other side. Is.

  The surface layer silicon rubber 1 in the present invention uses RTV type addition polymerization type silicone rubber mainly for suppressing thermal shrinkage during rubber processing. In general, the silicone rubber used for the blanket is mainly a mold-taking grade among the above-mentioned silicone rubbers, but is not particularly limited as long as it is printable.

  The hardness of the surface silicon rubber is preferably in the rubber hardness range of 30 to 70. If the rubber hardness is less than 30, it is too soft, so that scratches and the like are easily generated, and there is a problem in printing durability. This is because when the rubber hardness is 70 or more, it becomes too hard, and the print quality is inferior without being able to absorb the film thickness difference of the blanket and other factors leading to nip variation.

  The film thickness of the surface silicon rubber is preferably 0.2 mm or less. If the thickness is 0.2 mm or more, the change in film thickness due to swelling becomes large, so the printing quality is not stable during continuous printing.

  The printing blanket of the present invention requires the solvent barrier layer 2 under the surface silicon rubber 1 in order to prevent further penetration of the solvent. If the solvent soaks into the lower layer, for example, swelling of the lower rubber layer 3 or deterioration due to the solvent occurs, the printing quality is not stable, and not only the quality deteriorates but also the printing durability is deteriorated. It is to connect.

Further, the solvent barrier layer is required to have smoothness that does not affect the surface silicon rubber, and at the same time, needs a certain degree of softness in order to take advantage of the characteristics of the lower rubber layer below the solvent barrier layer. From this point, a plastic film having solvent resistance is preferable.
This is because when the solvent barrier layer is formed of a metal or an inorganic material, the solvent barrier layer is too hard or brittle, so that the solvent barrier layer cannot take advantage of the elasticity of the lower rubber layer.

  The thickness of the plastic film is preferably 100 μm or less. When the thickness is larger than 100 μm, the absolute value of the film thickness variation of the plastic film increases according to the thickness, and thus the film thickness variation of the blanket increases, which is not preferable. Furthermore, the solvent barrier layer becomes dominant with respect to the elasticity in the thickness direction of the blanket, and it becomes difficult to absorb the nip by the elasticity of the rubber layer provided in the lower layer. As a result, there is also a drawback that it becomes impossible to absorb variations during ink transfer.

  The solvent barrier layer is preferably a PET film having a thickness of 100 μm or less because it has smoothness and has few defects such as fish eyes and is excellent in solvent resistance.

  The lower rubber layer 3 is provided under the solvent barrier layer 2 in order to compensate for the fact that the surface silicon rubber 1 alone is not a sufficient elasticity because it is a thin film. The hardness of the lower rubber layer is preferably in the rubber hardness range of 30 to 70 as with the surface silicon rubber. The material of the lower rubber layer is not particularly limited as long as it is selected considering printing suitability, but in one embodiment, the same silicon rubber as the surface silicon rubber is used.

  By providing the cushion layer 5 on the blanket, further improvement in printing quality can be expected. In general blankets, those obtained by laminating canvas impregnated with rubber are used. However, in the present invention, urethane sponge, polyolefin sponge, or other sponge-like material can be used as a cushion layer. If a canvas used in a general blanket is used, the cloth mesh will affect the smoothness of the blanket surface, which is not preferable.

The cushion layer may be integrated with the blanket. However, as a configuration at this time, the cushion layer 5 may come after the surface silicon rubber 1 / solvent barrier layer 2 / lower rubber layer 3, or the lower rubber layer. There may be one or more layers between 3 and the cushion layer 5. There is no problem even if any layer is formed below the cushion layer.
An advantage of integrating the cushion layer as a blanket is that if the cushion layer is present in the outermost layer, the thickness of the blanket can be improved by polishing the cushion layer. Even in the case of being positioned in the middle, the film thickness uniformity can be improved by performing polishing at that stage. In addition, since it is simple at the time of wearing and does not accidentally attach another cushion layer, it is an effective configuration in consideration of usability.

The method for making the printing blanket of the present invention is preferably the following method because it has good film thickness uniformity and is easy to make, but is not limited thereto.
First, 1) surface silicon rubber 1 / solvent barrier layer 2 is first prepared, then 2) lower rubber layer 3 and below are separately prepared, and then 1) surface silicon rubber 1 / solvent barrier layer 2 And 2) a method in which the lower rubber layer 3 and lower layers are bonded together.
On the other hand, in the method of laminating sequentially, as the number of layers increases, uniform formation of rubber becomes difficult, and as a result, there is a high possibility that film thickness variation will increase. Although variations in film thickness can be reduced by adding a polishing step, basically, improvement in film thickness uniformity for each layer leads to improvement in printing quality, so it is not preferable to rely only on the polishing step.

  As described above, the blanket for printing according to the present invention has been devised for the characteristics and configuration of the blanket, and can easily provide a blanket that is excellent in print quality and capable of improving productivity at low cost. Can do.

The present invention will be specifically described with reference to the following examples.
<Example 1>
First, as a rubber for the surface silicon rubber and the lower rubber layer, 100 parts by weight of GE Toshiba Silicone Co., Ltd .: TSE3457T and 10 parts by weight of TSE3457 (C) are mixed, stirred, defoamed, and silicon rubber Formulation was performed.

  Next, using a PET film (manufactured by Teijin Ltd .: Melinex 746 50 μm) as the solvent barrier layer 2, GE Toshiba Silicone Co., Ltd. product: ME153 is used as a primer for silicon rubber on one surface. Was applied using a wire bar coater so as to be about 1 μm.

  The silicone rubber prepared as described above was applied to the primer-treated solvent barrier layer so as to have a thickness of 0.1 mm using an applicator to form a surface silicon rubber. At this time, the surface roughness of the surface silicon rubber surface after curing was Ra = 2.1 μm.

  Subsequently, Teijin Limited: Melnex S250 μm was prepared as the base substrate 4, and the same primer treatment as that of the surface silicon rubber was applied to the surface, and the thickness of the lower rubber layer 3 was 0.3 mm using an applicator. The lower rubber layer was formed by performing application.

  The primer is applied to the surface of the surface silicon rubber / solvent barrier layer on the solvent barrier layer side under the same conditions, and then the primer-treated layer and the base rubber layer surface of the base substrate are bonded together at 150 ° C./0.5 The sheets were integrated by thermocompression bonding over time.

  Finally, as the cushion layer 5, Fujibow Atago Co., Ltd .: W-PAD-1200 (1.4) was prepared, and the surface silicon rubber / solvent barrier layer / lower rubber layer / PET film obtained above with a double-sided tape A cushion layer was bonded to the surface.

<Comparative Example 1>
A blanket was prepared in the same manner as in Example 1 except that the thickness of the surface silicon rubber was adjusted to 0.3 mm.

<Comparative example 2>
It was prepared in the same manner as in Example 1 except that Teijin Limited: Melinex S250 μm was used as the solvent barrier layer.

  The evaluation results of Example 1, Comparative Example 1, and Comparative Example 2 are shown in Table 1.

It is sectional drawing of the printing blanket in one Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Surface silicon rubber 2 ... Solvent barrier layer 3 ... Lower rubber layer 4 ... Base base material 5 ... Cushion layer

Claims (5)

In the printing blanket in which silicon rubber is arranged on the surface layer, a solvent barrier layer is provided under the surface layer silicon rubber, and further, a lower rubber layer having the same rubber hardness as the surface layer silicon rubber is arranged under the solvent barrier layer, A base substrate is disposed under the lower rubber layer, and a cushion layer is further disposed under the base substrate .
A blanket for printing, wherein the surface silicon rubber has a thickness of 0.2 mm or less, and the solvent barrier layer is a plastic film having a thickness of 100 μm or less . The blanket for printing according to claim 1, wherein the surface silicon rubber has a rubber hardness range of 30 to 70. The blanket for printing according to claim 1, wherein the plastic film is a PET film. The printing blanket according to any one of claims 1 to 3 , wherein a surface layer silicon rubber is formed in advance on the solvent barrier layer and then bonded to the lower rubber layer. It is a manufacturing method of the blanket for printing of any one of Claims 1-4 , Comprising: Surface silicon rubber is previously formed in the said solvent barrier layer, Then, it bonds together with a lower-layer rubber layer, It is characterized by the above-mentioned. A method of manufacturing a printing blanket.

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