JP2005125666A - Manufacturing method for blanket for printing and blanket for printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a thickness unevenness of a blanket surface. <P>SOLUTION: A manufacturing method for the blanket 15 for printing having a print layer 14 provided on a substrate layer 13 includes a step of integrating the substrate layer 13 with the print layer 14, and then a step of polishing a rear surface of the substrate layer 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a printing blanket having excellent flatness, and a printing blanket obtained by the manufacturing method.

  Generally, a printing blanket is formed of a base material layer composed of a multilayer of a base fabric and a compressible layer, and a printing layer formed on the base material layer. In manufacturing such a blanket, a method is generally adopted in which the thickness variation of the blanket is reduced by polishing the surface of the printing layer after forming the base material layer and the printing layer.

  In addition, as a method of manufacturing a blanket having an unpolished surface, the printing layer is formed without cross-linking the rubber or resin of the printing layer while keeping the release paper in close contact with the surface of the printing layer, and polishing the surface of the printing layer. Methods are also known. However, with this method, the thickness variation of the release paper and the contact method of the release paper tend to be uneven, and it is difficult to manufacture a blanket with a small thickness variation. That is, it is very useful to polish the surface of the printing layer in order to reduce the thickness variation of the blanket.

  On the other hand, in recent years, high definition of printed matter has been desired. For example, the photolithography method is currently applied as a method for forming a metal or resin with a high-definition pattern shape such as a straight line, curve, or lattice pattern with a film thickness of several μm or less and a width of several tens of μm on a flat plate. It is generally done. However, the photolithography method has a drawback that the number of steps is very large and the manufacturing cost cannot be reduced. Therefore, an attempt has been made to form a high-definition pattern on a flat plate at a low cost by a printing method.

  By the way, as a blanket for printing a high-definition pattern shape, a blanket in which the print layer surface is mirror-finished has been proposed. Here, as a method of mirroring the surface of the printing layer, for example, a method of forming a printing layer in a state where a smooth film is adhered, or a method of forming a liquid raw material on a base material layer using various coaters. Proposed.

  Generally, it is desirable that the printing blanket has a small thickness unevenness, and preferably the thickness variation within the blanket surface is 20 μm or less. The reason for this is that if the thickness variation in the blanket plane exceeds 20 μm, the contact pressure between the blanket, the plate, and the substrate becomes non-uniform, and the printing pattern is disturbed.

  Patent Document 1 discloses that a blanket is manufactured using a mold when, for example, it is required that the printing layer surface of the blanket is a mirror surface. However, according to this technique, as the size of the blanket increases, a large blanket mold is required, which causes an accuracy limit. Moreover, when actually manufacturing a blanket, a large number of molds are required, which may increase the cost.

  Patent Document 2 describes a printing blanket structure in which a blanket having a base layer and a surface layer laminated on one side thereof, the opposite surface of the base layer being in a substantially non-woven processed state, and a substantially non-woven processed state Therefore, it is described that the outer surface of the woven fabric of the base layer is subjected to abrasion treatment and the base layer is covered with a synthetic resin or the like.

However, in the blanket structure described in Patent Document 1, the point where the warp and weft of the fabric on the back of the blanket intersect with each other rubs the cylinder to cause metal peeling of the cylinder. By covering the surface, the back surface is smoothed and the pressure applied to the blanket is distributed over the entire surface, which is different from the purpose of the present application. In addition, only the method described in Patent Document 2 cannot provide a blanket with a thickness variation as small as possible in order to form a high-definition image, which is an object of the present application.
JP-A-8-112981 (paragraph [0016] etc.) JP-A-2-269095 (Claims etc.)

  The present invention has been made in consideration of such circumstances, and by integrating the base material layer and the printing layer and polishing the back surface of the base material layer, the thickness variation in the blanket surface is reduced compared to the conventional case. An object of the present invention is to provide a method for producing a printing blanket.

  Another object of the present invention is to provide a printing blanket with less variation in the thickness of the blanket surface compared to the prior art.

The printing blanket manufacturing method according to the present invention is a printing blanket manufacturing method in which a printing layer is provided on a substrate layer, and after the substrate layer and the printing layer are integrated, the back surface of the substrate layer is polished. It is characterized by doing.
It is preferable that the printing blanket according to the present invention is manufactured by the manufacturing method, and the surface of the printing layer is made of an unpolished silicone rubber.

  In this invention, it is preferable that the said base material layer consists of two or more layers, and the lowest layer is rubber | gum or its foam. In this case, the surface in contact with the lowest blanket cylinder is the back surface of the base material layer. Thereby, it becomes easy to polish the back surface of the base material layer, and a blanket with small thickness variation can be manufactured.

  According to the present invention, it is possible to obtain a printing blanket that can reduce the thickness variation in the blanket plane as compared with the prior art.

  Hereinafter, the present invention will be described in more detail.

  In the present invention, for example, rubber is used as the material of the printing layer. As the rubber, any rubber such as silicone rubber, acrylonitrile / butadiene rubber, ethylene propylene rubber, fluorine rubber, urethane rubber, chloroprene rubber, epichlorohydrin rubber, natural rubber and the like can be used. In a rubber blanket used for printing a precision pattern, silicone rubber or silicone resin and rubber containing them are desirable.

  In the present invention, examples of the substrate layer include a composite layered body composed of a compression layer disposed on the lower layer side and an elongation preventing layer provided on the compression layer. Here, as the material of the compression layer, for example, silicone rubber, acrylonitrile-butadiene rubber, ethylene propylene rubber, fluorine rubber, urethane rubber, chloroprene rubber, epichlorohydrin rubber, natural rubber, and foams thereof can be used.

  As the material of the stretch stop layer, various resin films such as polyethylene terephthalate, polybutylene terephthalate, polypropylene, polyimide, polycarbonate, etc., various metal films such as stainless steel, cloth made of various fibers, non-woven fabric, etc. are used. it can.

  As in the present invention, after the base material layer and the print layer are integrated, the back surface of the base material layer is polished to reduce the in-plane blanket thickness variation. In addition, when the lowermost layer of the base material layer has a structure made of rubber or a foam thereof, the back surface of the base material layer can be easily polished and a blanket having a small thickness variation can be manufactured. In the case of a blanket with a printed layer surface having a mirror surface, a blanket with a small thickness variation can be produced by the above. Furthermore, in the blanket which grind | polishes the printing layer surface, a blanket with small thickness variation can be manufactured by grind | polishing a base material layer after grinding | polishing the printing layer surface. Here, as a method of making the surface of the printing layer a mirror surface, a known technique such as a method of forming the printing layer in a state where a smooth film is in close contact with the surface of the printing layer as described above can be used.

  Next, a printing blanket according to an embodiment of the present invention and a printing blanket according to a comparative example will be described. In the following Examples and Comparative Examples, a printing blanket having a size of 1000 mm × 1000 mm was manufactured by the method described below.

(Example 1)
FIG. 1 shows a cross-sectional view of a printing blanket according to Embodiment 1 of the present invention. The first embodiment and other printing blankets are also originally used in an annular shape, but only a partial cross-sectional view is disclosed in FIG. 1 and other drawings for convenience. However, the printed layer described later is positioned on the front side, and the NBR foamed rubber layer (or polyurethane foamed rubber layer) described below is positioned on the back side.

  The code | symbol 13 in a figure shows the base material layer of thickness 1.2mm. The base material layer 13 is composed of an NBR foam rubber layer 12 having a thickness of 0.3 mm, which is the lowermost layer, and cotton cloths 11a, 11b, and 11c each having a thickness of 0.2 mm that are sequentially formed on the NBR foam rubber layer 12. And a laminate 11 having a thickness of 0.7 mm. An NBR layer (printing layer) 14 having a thickness of 0.7 mm is formed on the base material layer 13. In such a printing blanket, the back surface of the NBR foam rubber layer 12 as the lowermost layer is polished, and the surface of the printing layer 14 is mirror-finished.

Next, a method for producing such a printing blanket 15 will be described.
First, three cotton cloths 11a, 11b, and 11c are impregnated with rubber paste dissolved in toluene by adding a crosslinking agent and an adhesive to NBR, and bonded to each other to form a laminate of three cotton cloths with a thickness of 0.7 mm. The body 11 was molded. Next, an NBR rubber paste for a printing layer is molded to a thickness of 0.7 mm on one side of the laminate 11 and dried, and then an NBR rubber paste containing a foaming agent is 0.3 mm on the opposite surface of the laminate 11. The layer was molded and dried to form a printed layer 14 on one side of the laminate 11, and an NBR foam rubber layer 12 was formed on the opposite side of the laminate. Subsequently, a stainless steel film (thickness: 0.1 mm) having a smooth surface was brought into intimate contact with the printed layer 14 and subjected to pressure vulcanization at 155 ° C. for 2 hours. Thereafter, the stainless steel film is peeled to peel off the laminated body 11 composed of the cotton fabrics 11a, 11b, and 11c, and the NBR foam rubber layer that is provided on the back side of the laminated body 11 and constitutes the base material layer 13 together with the laminated body 11. 12 and a printed layer 14 formed on the front surface side of the laminate 11, the back surface of the NBR foam rubber layer 12 is polished, and the surface of the printed layer 14 is mirror-finished for a thickness of 1.7 mm. A blanket 15 was produced.

  As described above, in the printing blanket according to Example 1, the base material layer 11 is configured by the laminated body 11 including the cotton fabrics 11a, 11b, and 11c and the NBR foam rubber layer 12 whose back surface is polished. A printed layer 14 having a mirror-finished surface is provided thereon. Therefore, the first embodiment has the following effects.

  That is, by polishing the back surface of the base material layer 13, that is, the NBR foam rubber layer 12, the variation in the blanket in-plane thickness can be reduced. Moreover, by making the lowermost layer of the base material layer 13 an NBR foam rubber layer, the back surface of the base material layer 13 can be easily polished, and a blanket having a small thickness variation can be manufactured. Furthermore, since the surface of the printing layer 14 is mirror-finished, a blanket with a smaller thickness variation can be manufactured.

(Example 2)
FIG. 2 shows a cross-sectional view of a printing blanket according to Embodiment 2 of the present invention. However, the same members as those in FIG. The code | symbol 23 in a figure shows the base material layer of thickness 1.2mm. The base material layer 23 is a laminated layer having a thickness of 0.7 mm, which includes a polyurethane foam rubber layer 22 having a thickness of 0.5 mm, which is the lowermost layer, and cotton fabrics 11a, 11b, and 11c sequentially formed on the polyurethane foam rubber layer 22. It consists of a body 11. A silicone rubber layer (printing layer) 24 having a thickness of 0.5 mm is formed on the base material layer 23. In such a printing blanket, the back surface of the polyurethane foam rubber layer 22 as the lowermost layer is polished, and the surface of the printing layer 24 is mirror-finished.

Next, a method for producing such a printing blanket 15 will be described.
First, a polyurethane foam rubber layer 22 having a thickness of 0.6 mm was attached to the above-described laminate 11 through a primer (not shown). Next, a one-component liquid addition type silicone rubber (trade name: TSE322, manufactured by GE Toshiba Silicones Co., Ltd.) serving as a printing layer was formed on the opposite surface of the laminate 11 with a knife coater to a thickness of 0.5 mm. . Subsequently, silicone rubber was crosslinked at 120 ° C. for 1 hour to form a silicone rubber layer (printing layer) 24 having a mirror surface. Subsequently, one surface of the polyurethane foam rubber layer 22 was polished to produce a printing blanket having a thickness of 1.7 mm.

  In the printing blanket according to Example 2, the base material layer 23 is configured by the laminate 11 composed of the cotton fabrics 11a, 11b, and 11c and the NBR foam rubber 212 whose back surface is polished, and the surface is formed on the surface of the base material layer 23. A mirrored printing layer 24 is provided. Therefore, the second embodiment has the following effects.

  That is, by polishing the back surface of the base material layer 23, that is, the NBR foam rubber layer 22, variation in the blanket in-plane thickness can be reduced. Further, by forming the polyurethane foam rubber layer 22 as the lowermost layer of the base material layer 23, the back surface of the base material layer 23 can be easily polished and a blanket having a small thickness variation can be manufactured. Furthermore, since the surface of the printing layer 24 is mirror-finished, a blanket with a smaller thickness variation can be manufactured.

(Comparative Example 1)
The printing blanket 3 according to Comparative Example 1 is as shown in FIG. Reference numeral 1 in the drawing indicates a laminate (base material layer) 1 having a thickness of 0.7 mm made of cotton cloth 1a, 1b, 1c. An NBR layer (printing layer) 2 having a thickness of 0.7 mm and having a mirror-finished surface is provided on one surface of the base material layer 1 to constitute a printing blanket 3.

The manufacturing method of the printing blanket of FIG. 3 is as follows.
First, three cotton cloths 1a, 1b, and 1c are impregnated with rubber paste dissolved in toluene by adding a crosslinking agent and an adhesive to NBR, and bonded to each other to form a base material having a thickness of 0.7 mm made of three cotton cloths. Material layer 1 was formed. Next, a rubber composition in which a crosslinking agent and a reinforcing agent were added to NBR was prepared, dissolved in methyl ethyl ketone, applied on the base material layer 1 to a thickness of 0.7 mm, and dried. Subsequently, the printing layer 2 surface smooth stainless film (thickness 0.1 mm) on is adhered, 0.99 ° C., after press vulcanization at a pressure 3 kg / cm ^2, printing layer was peeled stainless film 2 A blanket 3 for printing having a thickness of 1.4 mm was prepared.

(Comparative Example 2)
The printing blanket 6 according to Comparative Example 2 is as shown in FIG. However, the same members as those of FIG. A silicone rubber layer (printing layer) 5 having a thickness of 0.5 mm and having a mirror-finished surface is provided on one side of the 0.7 mm-thick laminate 1 made of the cotton fabrics 1a, 1b, and 1c. A polyurethane foam rubber layer 4 having a thickness of 0.5 mm is provided on the opposite surface (lower surface) of the laminate 1, and constitutes a base material layer 7 together with the laminate 1. A printing blanket is constituted by the base material layer 7 and the printing layer 5 having a mirror-finished surface.

  The manufacturing method of the printing blanket of FIG. 4 is as follows.

First, a polyurethane foam rubber layer 4 having a thickness of 0.5 mm was attached to the laminate 1 having a thickness of 0.7 mm via a primer (not shown). Next, a one-component liquid addition type silicone rubber (trade name: TSE322, manufactured by GE Toshiba Silicones Co., Ltd.), which becomes a printing layer, is formed on the opposite surface of the laminate 1 with a knife coater to a thickness of 0.5 mm. did. Subsequently, the silicone rubber was crosslinked at 120 ° C. for 1 hour to form a printing layer 5 having a mirror surface, and the printing blanket 6 having a thickness of 1.7 mm in FIG. 4 was obtained.

(test)
In-plane thickness variations of each printing blanket having a size of 1000 mm × 1000 mm according to Examples 1 and 2 and Comparative Examples 1 and 2 manufactured as described above were compared. Moreover, the dot pattern which is a square of 200 micrometers x 200 micrometers was printed on the glass substrate using the flat plate lithographic printing machine, and the shift compared with the obtained printing pattern plate shape was measured. The results are as shown in Table 1 below.

However, in Table 1, the thickness in the blanket plane was measured at 100 points, and the difference between the maximum value and the minimum value was regarded as variation. The deviation of the printing pattern from the plate shape was determined to be “good” if it was 3 μm or less.
From Table 1 above, it is clear that the printing blanket of the present invention is excellent in both the in-plane thickness variation and the deviation from the plate shape as compared with the printing blanket of the comparative example. .

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

1 is a schematic cross-sectional view of a printing blanket according to Embodiment 1 of the present invention. FIG. 5 is a schematic cross-sectional view of a printing blanket according to Embodiment 2 of the present invention. FIG. 3 is a schematic cross-sectional view of a printing blanket according to Comparative Example 1. 4 is a schematic cross-sectional view of a printing blanket according to Comparative Example 2. FIG.

Explanation of symbols

11 ... Laminated body, 11a, 11b, 11c ... Cotton cloth,
12 ... NBR foam rubber layer, 13, 23 ... Base material layer,
14, 24 ... printed layer, 12 ... NBR foam rubber layer,
15, 25 ... Blanket for printing.

Claims (3)

  In the manufacturing method of the blanket for printing which provided the printing layer on the base material layer, after integrating the said base material layer and the printing layer, the back surface of a base material layer is grind | polished, The manufacturing method of the printing blanket characterized by the above-mentioned .   The method for producing a printing blanket according to claim 1, wherein the base material layer comprises a plurality of layers, and the lowermost layer thereof is rubber or a foam thereof.   A printing blanket manufactured by the manufacturing method according to claim 1, wherein the surface of the printing layer is made of an unpolished silicone rubber.

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