JP2003054152A - Method for manufacturing printing blanket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a printing blanket by which the thickness variability can be prevented from occurring and the generation of print irregularities can be inhibited. SOLUTION: The method for manufacturing the printing blanket 10 comprises the steps to introduce a base cloth 13a with a surface printing layer 11 and base cloths (13b to 13d) with an adhesive layer into a continuous vulcanizing machine 20 equipped with a heating drum 21 and a conveying belt 22 and laminate/vulcanize the base cloths (13b to 13d) simultaneously. The base cloths (13b to 13d) with the adhesive layer are obtained by applying a gum for the adhesive layer over the surface of the base cloth or contact-bonding the gum for the adhesive layer molded in the form of a thin layer to the base cloth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a printing blanket, and more particularly, to a method for manufacturing a printing blanket having extremely small thickness variation.

[0002]

2. Description of the Related Art Conventionally, as a printing blanket used for offset printing, one in which a surface printing layer made of rubber is provided on a laminate (support layer) containing a plurality of base fabrics is often used. Further, in recent years, an air blanket having a porous compressive layer inside for the purpose of adjusting the pressure (printing pressure) during printing has become the mainstream. These printing blankets are required to have extremely strict thickness accuracy from the viewpoint of achieving extremely excellent printing quality. Specifically, generally, in offset printing, the printing pressure is 0.01
It is required to set the value in an extremely small order of mm, and therefore, the printing blanket is also required to have an extremely high degree of precision in which the thickness variation is suppressed to 0.01 mm or less. In offset printing, there are two steps: transfer of ink from the printing plate to the printing blanket and transfer of ink from the blanket to the printing material such as paper, so the variation in the thickness of the printing blanket causes halftone dots. This is because it greatly affects the final print quality, such as causing unevenness in size and ink receptivity.

[0003]

There are roughly two known methods for producing a conventional printing blanket.
One of them is a method in which the rubber for the adhesive layer, the rubber for the surface printing layer and the rubber for the compressible layer are used as a rubber paste dissolved in an organic solvent such as toluene or methyl ethyl ketone. In this method, as described in detail in Comparative Example 1 to be described later, the rubber paste is applied to the surface of the base cloth in advance or to the surface of the surface printing layer or the compressive layer provided on the base cloth. After the layers made of the rubber glue are pressure-bonded to each other to be laminated, the rubber glue is further applied to the surface of the laminate, and the rubber glue surfaces of the other base cloth and the like are pressure-bonded to each other, which is repeated. . That is, a printing blanket is formed by sequentially laminating a base cloth or a laminated body thereof on which rubber glue is applied.

Another method is to use a rubber for an adhesive layer by molding it into a thin layer. In this method, the thin layer rubber is preliminarily pressure-bonded to the surface of the base fabric or the surface of a surface printing layer or a compressible layer provided on the base fabric, and the thin layer rubbers are pressure-bonded to each other. After stacking,
Further, the operation of pressing the thin layer rubber on the surface of the laminated body and pressing the thin layer rubber with other base cloth and the like is repeated. That is, a printing blanket is formed by sequentially adhering a base cloth or a laminate thereof to which thin layer rubber is pressure-bonded to each other.

However, in the former method (using rubber glue), tensile stress and compressive stress are repeatedly applied to the base fabric by repeating the operations of gluing and pasting, and as a result, the stress causes the stress. The problem arises that the strain remains on the base fabric. Such distortion becomes unevenness after vulcanization of the rubber paste and remains in the inside of the support layer, which becomes a major factor of reducing the thickness accuracy of the printing blanket. In addition, the latter method (using thin layer rubber) does not consume a large amount of organic solvent as in the case of preparing a rubber paste, and has an environmental advantage. However, the thin rubber for the adhesive layer needs to be arranged on each joint surface of the two members to be bonded together, and the thickness of each adhesive rubber layer must be extremely thin, less than 0.1 mm. Therefore, there is a problem that rubber breakage is likely to occur when the layer is thinned.

By the way, in the manufacture of printing blankets in recent years, a method of producing a plurality of printing blankets at a time by using a continuous base cloth having a long overall length is adopted. In the case of using such a long-length base cloth, no matter which of the above-mentioned methods is used, for convenience of work, a rubber paste is applied to the base cloth, or a thin layer of rubber is pressure-bonded, After laminating the base fabric or the like, it is necessary to wind the base fabric or the laminated body on a roll each time.
Here, when the rubber paste is simply applied to one base fabric or the thin layer rubber is wound in the state of being wound, there is no risk of distortion due to the work, but the lamination When it is wound up after that, the strain remains in the laminate, which causes a problem that the accuracy of the thickness is lowered.

Each of the above methods includes a step of sequentially laminating a base cloth or a laminated body thereof with a rubber paste, or a base cloth or a laminated body of which a thin layer rubber is pressure-bonded. Therefore, it is unavoidable that the distortion remains inside the printing blanket and the thickness varies. Then, the objective of this invention is providing the manufacturing method of the blanket for printing which can prevent that variation in thickness arises and can suppress generation | occurrence | production of printing unevenness.

[0008]

Means for Solving the Problems and Effects of the Invention A method for manufacturing a printing blanket according to the present invention for solving the above problems includes a base cloth having a surface printing layer and a base cloth having an adhesive layer. It is characterized in that it is introduced into a vulcanizer to carry out the bonding and vulcanization of the base cloth at the same time. According to the method for producing a printing blanket according to the present invention, since the base fabric including the surface printing layer and the adhesive layer are simultaneously laminated and vulcanized, the conventional base fabric is laminated and glued. It is not necessary to repeat the winding process for each base fabric. Therefore, it is possible to avoid the repeated application of tensile stress or compressive stress to the base fabric, and it is possible to prevent variations in the thickness of the printing blanket or unevenness in printing. The quality can be improved.

Therefore, the method for producing a printing blanket according to the present invention is suitable as a method for producing a high quality printing blanket. Incidentally, JP-A-2000-4344
Japanese Patent Publication No. 2 discloses a printing blanket in which a laminate including a surface rubber layer, a compression layer containing microballoons, and at least two reinforcing layers is integrated by one vulcanization ( (See claim 1 column). However, in the publication, as is clear from the description in the [Example] column, a printing blanket is formed by sequentially laminating a base fabric and a compressible layer forming a support layer, and a surface printing layer. It is manufactured, and as described above, no consideration is given to the problem of distortion due to the repetition of the bonding process. Therefore, unlike the printing blanket obtained by the manufacturing method of the present invention, the printing blanket disclosed in the above publication cannot prevent variation in thickness and the occurrence of uneven printing.

In the method for manufacturing a printing blanket according to the present invention, the base cloth having the adhesive layer may be obtained by gluing a rubber paste for an adhesive layer on the surface of the base cloth,
The adhesive layer rubber formed in a thin layer may be pressure-bonded to the base cloth. Incidentally, also for the base fabric having the surface printing layer and the base fabric having the compressible layer, similarly to this,
The surface of the base cloth may be glued with a rubber paste for a surface printing layer or a compressible layer, and a rubber for a surface printing layer or a compressible layer formed in a thin layer may be used as a base material. It may be formed by pressing on a cloth.

In the present invention, the layer structure of the printing blanket is not particularly limited, and various conventionally known layer structures can be adopted. Specifically, the number of laminated base fabrics provided with an adhesive layer may be appropriately set according to the thickness and strength required for the printing blanket. In addition, normally, the number is set to about 2 to 5. Further, in the present invention, a base cloth having a compressive layer is arranged between a base cloth having the surface printing layer and a base cloth having the adhesive layer, or between base cloths having the adhesive layer. You may. In this case, the printing blanket can be of the so-called air type. The air-type printing blanket can lower the compressive stress in the nip deforming portion caused by the pressure contact with the printing plate, as compared with the so-called solid type that does not have a compressible layer, and it is accompanied by a change in strain amount. The fluctuation of the compressive stress can be reduced. Therefore, the printing blanket can be made to have excellent shock absorption, and printing defects such as bulging due to stress concentration on the nip deformed portion, misregistration, paper feeding failure, double-sided, and halftone dot pattern deformation can occur. It can be prevented from occurring.

In the method for producing a printing blanket according to the present invention, a vulcanizer for introducing a base cloth having a surface printing layer, a base cloth having an adhesive layer, or the like is a continuous vulcanizing machine having a heating drum and a conveyor belt. It is preferable to use a machine. By using such a continuous vulcanizer, it is possible to simultaneously and easily bond the base fabrics and vulcanize them, even when using a base fabric having a long overall length.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A method for manufacturing a printing blanket according to the present invention will be described in detail below with reference to the drawings. An example of a printing blanket obtained by the manufacturing method according to the present invention is shown in FIG. In the method for manufacturing a printing blanket according to the present invention, for example, as shown in FIG. 2, a base cloth 13a (adhesive layer 15a) including a surface printing layer 11 is provided.
Base fabric 13a having a surface printing layer 11 formed through
And a base cloth 13b having a compressible layer 14 (a base cloth 13b in which the compressible layer 14 is formed via an adhesive layer 15c),
Base cloth 13c, 13d provided with an adhesive layer (15d, 15e)
Are formed in advance, and these are wound on rolls 23, respectively. Then, these laminated bodies are introduced into the continuous vulcanizer 20 and passed between the thermal drum 21 and the conveyor belt 22, whereby the bonding and the vulcanization are simultaneously performed. 3 (a) to 3 (d) are enlarged views showing the layer structure of each of the base fabrics 13a to 13d shown in FIG.

The vulcanizing conditions in the continuous vulcanizer 20 are not particularly limited, and may be carried out according to a conventional method.
The printing blanket formed through the steps shown in FIG. 2 has the layer structure (laminated structure) shown in FIG. The laminated structure of the printing blanket according to the present invention is not limited to that shown in FIG. 1, and various design changes can be made according to the application of the blanket and the like.

(Base fabric 13a having surface printing layer 11) To form the base fabric 13a having the surface printing layer 11 shown in FIGS. 2 and 3 (a), for example, a continuous sheet-like base fabric 13a is used. Then, the adhesive for the adhesive layer may be glued, and then the adhesive for the surface printing layer may be glued to a predetermined thickness. Incidentally, FIG. 3A shows a laminated structure of the base cloth 13a, the surface printing layer 11 and the adhesive layer 15a at the position shown by the reference numeral (a) in FIG.

A laminate in which the surface printing layer 11 is formed on the base cloth 13a via the adhesive layer 15a (reference numeral (a) in FIG. 2).
) Together with the compressive layer 14 and the base fabrics 13b to 13d, which will be described later, are subjected to the steps of laminating and vulcanizing with the continuous vulcanizer 20 or the like. The rubber glue (rubber glue for the adhesive layer) used to form the adhesive layer 15a and the rubber glue (rubber glue for the surface printed layer) used to form the surface printing layer 11 are
A rubber composition suitable for each layer may be dissolved and swollen in an appropriate organic solvent such as toluene or methyl ethyl ketone (or a mixed solvent thereof).

The rubber composition for forming the surface printing layer is not particularly limited, but for example, acrylonitrile-
Butadiene rubber (NBR), chloroprene rubber (C
R), urethane rubber, polysulfide rubber and the like, so-called oil-resistant rubber which is less swelled by ink, and a conventionally known vulcanizing agent,
The vulcanization accelerator, the filler, the antiaging agent, the plasticizer, the reinforcing agent, the thickener and the like are appropriately mixed according to a conventional method. The rubber composition for forming the adhesive layer is not particularly limited, but, for example, a rubber material such as NBR, urethane rubber, CR, polysulfide rubber, etc., is added with a predetermined amount of a vulcanizing agent, a vulcanization accelerator, and a filling agent. Examples thereof include agents, plasticizers, etc., and, if necessary, a thickening agent, resin, etc., in order to impart tackiness.

The base cloth 13a is not limited to this, but from the viewpoint of minimizing the unevenness of the printing blanket, for example, a plain weave cloth made of cotton, polyester, rayon or a blended fiber thereof, or the like. A non-woven fabric made of the above material can be used. (Base Fabric 13b with Compressible Layer 14) FIGS. 2 and 3
In order to form the base cloth 13b including the compressible layer 14 shown in (b), for example, a continuous sheet-like base cloth 13b is glued with a rubber glue for an adhesive layer, and then the compressive layer is formed on the surface of the base cloth 13b. The rubber paste for use may be glued to a predetermined thickness and then vulcanized. Note that FIG. 3 (b) corresponds to the reference numeral (b) in FIG.
It shows a laminated structure of the base cloth 13b, the compressive layer 14, and the adhesive layers 15b and 15c at the location indicated by.

The laminate (reference numeral (b) in FIG. 2) in which the compressive layer 14 is formed on the base cloth 13b via the adhesive layer 15c and the adhesive layer 15b is further formed on the surface of the compressive layer 14 is described above. Together with the surface printing layer 11 and the base cloths 13c and 13d, the continuous vulcanizer 20 and the like are subjected to a bonding and vulcanizing step.
The rubber glue used to form the adhesive layers 15b and 15c may be the same as the rubber glue for the adhesive layer described above.

The same base cloth 13a as the above-mentioned base cloth 13a can be used for the base cloth 13b. The rubber paste (rubber paste for the compressible layer) used to form the compressible layer 14 is obtained by dissolving and stirring the rubber composition suitable for the compressible layer and the foam-forming particles in the above-mentioned organic solvent. There are some. Examples of the bubble-forming particles include water-soluble fine particles such as sodium chloride, starch, sugar, polyvinyl alcohol, gelatin, urea, cellulose, sodium sulfate, and potassium chloride; Microballoon "Expansel" series manufactured by Nobel Industries, Inc., Matsumoto So-called microcells (hollow fine particles), such as microcapsules manufactured by Yushi-Seiyaku Co., Ltd., shells made of thermosetting resin such as phenolic resin, and inorganic substances such as glass in which gas such as air is enclosed; azo Examples of the foaming agent include dicarbonamide, N, N'-dinitrosopentamethylenetetramine, p, p'-oxybisbenzenesulfonylhydrazide. The diameter of bubbles formed by the particles for forming bubbles is usually 10 to 100 μm.
It can be set within the range.

When water-soluble particles are used as the foam-forming particles (the water-soluble particles are mixed with the rubber paste for the compressible layer), the rubber paste for the compressible layer is vulcanized after sizing and then added to water. By immersing (eluting the water-soluble fine particles), bubbles are formed in the compressible layer 14. When using a foaming agent, microcells, etc. as the particles for forming bubbles (compounding the foaming agent, microcells, etc. with the rubber paste for the compressible layer), heat and vulcanize after gluing the rubber paste for the compressible layer. Thus, bubbles can be formed in the compressible layer 14, respectively.

The rubber composition for forming the compressible layer is not particularly limited, but for example, NBR, urethane rubber,
An oil resistant rubber such as CR or polysulfide rubber, which is appropriately blended with conventionally known vulcanizing agents, vulcanization accelerators, fillers, antioxidants, plasticizers, reinforcing agents, thickeners and the like according to a conventional method. Can be mentioned. (Base Fabric with Adhesive Layer) The base fabric 13c and the base fabric 13d shown in FIGS.
d, 15e. Adhesive layers 15d, 15e
In order to form the base fabrics 13c and 13d provided with, for example, a continuous sheet-shaped base fabrics 13c and 13d is glued with a rubber glue for an adhesive layer, or a rubber for an adhesive layer formed in advance in a thin layer is formed into a sheet form. It may be pressure-bonded to the base cloths 13c and 13d. 3 (c) and 3 (d) are the reference numerals in FIG.
It shows a laminated structure of the base cloths 13c and 13d and the adhesive layers 15d and 15e at the locations indicated by (c) and (d).

Adhesive layers 15d, 1 on the base cloths 13c, 13d
A laminate formed by forming 5e (reference numerals (c) and (d) in FIG. 2)
Is subjected to the step of laminating and vulcanizing with the continuous vulcanizer 20 and the like together with the surface printing layer 11 and the compressive layer 14 described above.

[0024]

EXAMPLES Next, the present invention will be described with reference to Examples and Comparative Examples. [Manufacture of Printing Blanket] The printing blanket 10 manufactured in the following Examples 1 and 2 and Comparative Example 1 is shown in FIG.
As shown in, the surface printing layer 11, the base cloth 13a, the compressive layer 14, the base cloth 13b, the base cloth 13c and the base cloth 13d are laminated in this order.

In the following examples and comparative examples, cotton woven cloth was used as the base cloth (13a to 13d). The composition of the rubber composition for the surface printing layer used in the following Examples and Comparative Examples is shown in Table 1, and the composition of the rubber composition for the compressible layer is shown in Table 2.
Table 3 shows the formulations of the adhesive layer rubber composition used for the adhesion between the respective layers.

[0026]

[Table 1]

[0027]

[Table 2]

[0028]

[Table 3]

The rubber composition for surface printing layer, the rubber composition for compressible layer, and the rubber composition for adhesive layer shown in Tables 1 to 3 were all prepared by mixing the rubber composition shown in the table with toluene at 1: 1:
The mixture was mixed at a weight ratio of 2 to obtain a rubber paste (rubber paste for surface printing layer, rubber paste for compressible layer, rubber paste for adhesive layer) and used. Of these, NBR1 for rubber glue for compressible layers
4 parts salt particles (average particles 20 μm) to 4
It was used after adding 0 parts by weight.

Example 1 (i) The surface of a cotton-made base cloth (thickness: 0.25 mm) was glued with the rubber glue for an adhesive layer to a thickness of 0.03 mm, and then the surface was covered with the above-mentioned surface. Rubber layer for printing layer 0.4m thick
By gluing so as to obtain m, an unvulcanized laminate in which the surface printing layer 11 was formed on the base cloth 13a via the adhesive layer 15a was obtained. This laminate (surface printing layer 11
The base fabric 13a) provided with was wound with a roller and stored [see reference numeral (a) in FIG. 2].

(Ii) The surface of a cotton base cloth (thickness: 0.30 mm) is glued with the rubber glue for the adhesive layer to a thickness of 0.03 mm, and then the surface is coated with the compressive layer. By gluing the rubber glue to a thickness of 0.35 mm,
An unvulcanized laminate in which the compressive layer 14 was formed on the base cloth 13b via the adhesive layer 15c was obtained. Next, this laminated body is vulcanized, and the vulcanized laminated body is immersed in water to elute the salt particles from the compressible layer 14 to form continuous pore-type voids in the compressible layer 14. Let After elution of the salt particles, the adhesive layer rubber paste is glued to the compressive layer 14 side of the laminate (base cloth 13b having the compressible layer 14) so that the adhesive layer 15b has a thickness of 0.05 mm. After forming, the film was wound with a roller and stored.

(Iii) Adhesive layer rubber paste is glued on the surface of a cotton base cloth (thickness: 0.30 mm) to a thickness of 0.15 mm to form a base cloth 13c having an adhesive layer 15d. After forming, it was wound with a roller and stored. (iv) After the adhesive layer rubber glue is glued on the surface of the cotton base fabric (thickness 0.38 mm) to a thickness of 0.15 mm to form the base fabric 13 d including the adhesive layer 15 e This was wound with a roller and stored.

Next, the base cloth 13a having the surface printing layer 11 obtained in the above (i) to (iv), the base cloth 13b having the compressive layer 14, and the base cloth 13c having the adhesive layer 15d. , The base cloth 13d provided with the adhesive layer 15e are arranged as shown in FIG. 2, and the thermal drum 21 of the continuous vulcanizer 20 and the conveyor belt 2 are arranged.
The base fabric was pasted and vulcanized at the same time by passing it between the two. After vulcanization, the surface of the surface printing layer 11 was polished to obtain a printing blanket 10 (total thickness 1.95 mm) having the layer structure shown in FIG.

Example 2 On the surface of a cotton base cloth (thickness: 0.30 mm), a rubber for an adhesive layer (thickness: 0.20 mm), which had been thinned by a roller head extruder, was overlaid and pressure-bonded. Then, after forming the base cloth 13c having the adhesive layer 15d, this was wound with a roller and stored. Cotton base cloth (thickness 0.38
mm) on the surface of the adhesive layer rubber (thickness: 0.20 m) that has been thinned in advance by a roller head extruder.
m) were overlaid and pressure-bonded to form a base cloth 13d having an adhesive layer 15e, which was then wound with a roller and stored.

Next, the base cloth 13a having the surface printing layer 11 obtained in the same manner as in (i) of Example 1 and (i of Example 1)
Base fabric 13 provided with a compressible layer 14 obtained in the same manner as in i)
b, the base cloth 13c having the adhesive layer 15d, and the base cloth 13d having the adhesive layer 15e are arranged as shown in FIG. 2, and the thermal drum 21 of the continuous vulcanizer 20 and the conveyor belt 2 are arranged.
The base fabric was pasted and vulcanized at the same time by passing it between the two.

After vulcanization, the surface of the surface printing layer 11 is polished to give a printing blanket 10 having the layer structure shown in FIG.
(Total thickness 1.95 mm) was obtained. Comparative Example 1 (Conventional production method) A printing blanket was produced according to the following procedures (a) to (k). (a) 0.03 mm thickness of the adhesive rubber glue on the base cloth 13b
After gluing so that
(c) above, the rubber paste for the compressible layer is sized and vulcanized to a thickness of 0.35 mm, and after vulcanization, salt particles contained in the rubber composition for the compressible layer are extracted with water. By doing so, a compressible layer 14 was obtained. After forming the compressible layer 14, the adhesive rubber paste was glued on the surface so that the thickness was 0.03 mm (adhesive rubber 15b ″).

(B) The base rubber 13a is glued with the above-mentioned adhesive rubber paste to a thickness of 0.03 mm (the adhesive rubber 15
b '), wound up with a roller. (c) The adhesive rubber 15b ″ formed on the compressible layer 14 in (a) above and the adhesive rubber 15b ′ formed on the base cloth 13a in (b) above are overlapped to form a pair. The two were stuck together by passing them between the rolls. [See FIG. 4 (a)] (d) The surface of the base cloth 13b is coated with the adhesive rubber paste to a thickness of 0.0
Glue to 7 mm (Adhesive rubber 15
d ′), rolled up with a roller.

(E) Adhesive rubber paste is applied to the base cloth 13c to a thickness of 0.07 mm (adhesive rubber 15
d ″), wound up with a roller. (f) Adhesive rubber 1 on the base cloth 13b formed in (d) above
5d 'and the adhesive rubber 15d''formed in (e) above were superposed and passed through a pair of rolls to bond them. [Refer to FIG. 4 (b)] (g) The surface of the base cloth 13c is coated with the adhesive rubber paste to a thickness of 0.0
Glue to 7 mm (Adhesive rubber 15
e ′), wound up with a roller.

(H) The base cloth 13d is glued with the adhesive rubber glue so that the thickness thereof becomes 0.07 mm (the adhesive rubber 15
e ″), wound up with a roller. (i) Adhesive rubber 1 on the base cloth 13c formed in (g) above
5e ′ and the adhesive rubber 15e ″ formed in (h) above were superposed and passed through a pair of rolls to bond them. [Refer to Fig. 4 (c)] (j) Adhesive rubber glue is applied to the surface of the base cloth 13a to a thickness of 0.03 m.
Then, the surface printing layer was rubbed with the rubber paste for the surface printing layer to a thickness of 0.40 mm.

(K) The laminate thus obtained was set in a continuous vulcanizer and vulcanized by passing it between a heating drum and a belt. Further, the surface printing layer 11 was polished to obtain a printing blanket (total thickness 1.95 mm) having the same layer structure as shown in FIG. [Evaluation of Printing Unevenness] A printing test was carried out using the printing blankets obtained in Examples 1 and 2 and Comparative Example 1 to evaluate the degree of occurrence of printing unevenness.

In the printing test, a printing machine (model number "560") manufactured by Ryobi Co., Ltd. was used to repeatedly print 50% halftone dot images on coated paper. Printing speed is 10,000 per hour
It was a piece. The printing pressure during printing is 0.15m.
m, 0.10 mm, and 0.05 mm were adjusted in three stages, and the test was performed for each printing pressure. After printing 10,000 sheets, the unevenness of halftone dots of the printed matter was visually confirmed, and evaluated according to the following criteria. A: No print unevenness was observed. A ⁻ : Printing quality was good, although slight printing unevenness was observed. B: Printing unevenness was observed, and the print quality was not practically sufficient. C: Printing unevenness was remarkable, and it could be determined that the printing was defective.

[0042]

[Table 4]

As is clear from Table 4, the steps of laminating the base fabrics or the laminating of the base fabrics with the surface printing layer and the like are carried out at the same time, and the vulcanization process of the laminate obtained by the process is carried out in the laminating process. According to the printing blankets of Examples 1 and 2 which were continuously performed successively, when the printing pressure was high (0.15 mm) or when the printing pressure was extremely low (0.05 m).
In each case of m), good quality printing could be performed without causing print unevenness. From these results, it was found that the printing blankets of Examples 1 and 2 had extremely high thickness accuracy.

On the other hand, in the printing blanket of Comparative Example 1 manufactured by sequentially laminating a plurality of base fabrics, surface printing layers and the like, the printing unevenness was remarkable when the printing was low. From these results, it was found that the thickness accuracy of the printing blanket of Comparative Example 1 was practically insufficient.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a printing blanket.

FIG. 2 is a schematic diagram showing a step of laminating and vulcanizing layers forming a printing blanket.

3 (a) is a cross-sectional view showing the layer structure at the portion indicated by reference numeral (a) in FIG. 2, and (b) is a cross-sectional view showing the layer structure at the portion indicated by reference numeral (b) in FIG. 2C is a cross-sectional view showing the layer structure at the portion indicated by the reference numeral (c) in FIG. 2, and (d) is a cross-sectional view showing the layer structure at the portion indicated by the reference numeral (d) in FIG. is there.

FIG. 4 is a schematic cross-sectional view showing a manufacturing process of a printing blanket in Comparative Example 1.

[Explanation of symbols]

10 printing blanket, 11 surface printing layer, 1
3a base cloth, 13b base cloth, 13c base cloth, 13d
Base cloth, 14 compressible layer, 15a adhesive layer, 15
b adhesive layer, 15c adhesive layer, 15d adhesive layer,
15e Adhesive layer, 20 Continuous vulcanizer.

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Claims (5)

[Claims] 1. A printing method, characterized in that a base cloth having a surface printing layer and a base cloth having an adhesive layer are introduced into a vulcanizing machine to simultaneously bond and vulcanize the base cloth. Blanket manufacturing method. 2. The method for producing a printing blanket according to claim 1, wherein the base cloth having the adhesive layer is obtained by gluing a rubber adhesive for an adhesive layer on the surface of the base cloth. 3. The method for producing a printing blanket according to claim 1, wherein the base cloth provided with the adhesive layer is obtained by press-bonding a rubber for an adhesive layer formed into a thin layer onto the base cloth. 4. A base fabric having a compressible layer is arranged between a base fabric having the surface printing layer and a base fabric having the adhesive layer, or between base fabrics having the adhesive layer. Item 1
4. The method for manufacturing a printing blanket according to any one of 3 to 3. 5. The method for manufacturing a printing blanket according to claim 1, wherein the vulcanizer is a continuous vulcanizer including a thermal drum and a conveyor belt.