JPH11188975A - Blanket for printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blanket for printing which has proper nerve (degree of rigidity) and recovery as well and which can be used in a printing machine for business form. SOLUTION: In the blanket 1 for printing, a rigidity imparted layer 3 comprising at least one cloth selected from the group consisting of a polyester synthetic fiber cloth, vinyl synthetic fiber cloth, aramid fiber cloth, and high-density polyethylene fiber cloth is formed on one side of a compressive layer 2, or a rigidity imparted layer 3 having Young's modulus of 50-250 g/d is formed on the layer 2, so that a surface rubber layer 4 is formed on the layer 2 through the layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing blanket, and more particularly to a printing blanket usable for a business form printing machine.

[0002]

2. Description of the Related Art Offset printing, which is one of printing methods, has been widely used as a method capable of high quality printing. In offset printing, dampening water and ink are generally supplied to a blanket cylinder equipped with a blanket, and then the ink on the blanket is transferred to the printing material supplied between the blanket cylinder and the impression cylinder to perform printing. Yes, the blanket plays a very important role. Therefore, it is necessary to use an optimal blanket according to the use, purpose, printing conditions, and the like of the printed matter.

[0003] On the other hand, business forms such as slips, continuous forms, output paper, etc. are often printed with ruled lines, solid portions, optically readable characters, etc., and are different from ordinary color prints. Printed using an offset printing press. The blanket used in this business form printing machine has a stiffness (rigidity) for facilitating mounting work on the blanket cylinder, and restores to compression for good printing. It is required to be as thin as about 1 mm in order to be mounted on a blanket cylinder having a small cylinder diameter.

[0004]

A blanket is generally a laminated structure in which a surface rubber layer is formed on a compressible layer. In order to impart the required properties to the blanket, for example, a nonwoven fabric is used for the compressible layer. A blanket (Japanese Utility Model Application Laid-Open No. 63-30165, etc.) and a blanket using a rubber sponge for a compressible layer (Japanese Patent Application Laid-Open No. 2-235696) are disclosed.

[0005] However, no conventional printing blanket used in a business form printing press has both the above-mentioned stiffness (high rigidity) and resilience.

The present invention has been made in view of the above-mentioned circumstances, and has a suitable waist strength (rigidity) and resilience, and can be used in a printing press for business forms. The purpose is to provide.

[0007]

In order to achieve the above object, a printing blanket of the present invention has a surface rubber layer on one surface of a compressible layer via a stiffening layer. The layer had a structure composed of at least one of polyester-based synthetic fiber cloth, vinyl-based synthetic fiber cloth, aramid fiber cloth, and high-density polyethylene fiber cloth.

The printing blanket of the present invention has a structure in which a surface rubber layer is provided on one surface of the compressible layer via a stiffening layer having a Young's modulus in the range of 50 to 250 g / d. .

In the above printing blanket, the stiffness-imparting layer is formed by heat-sealing, and the compressible layer is formed of at least one of a double or multilayer woven fabric, nonwoven fabric and rubber sponge. The configuration was as follows.

[0010] Further, the printing blanket of the present invention comprises:
An adhesive layer was provided on the other surface of the compressible layer, and a release sheet was provided on the adhesive layer.

In the present invention as described above, the rigidity-imparting layer imparts stiffness (rigidity) for facilitating the mounting work on the blanket cylinder, and the compressive layer has a good compressive layer. The resilience necessary for performing a proper printing is provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.

FIG. 1 is a schematic sectional view showing an embodiment of the printing blanket of the present invention. In FIG. 1, a printing blanket 1 of the present invention includes a surface rubber layer 4 on one surface of a compressible layer 2 with a stiffening layer 3 interposed therebetween, and is separated from an adhesive layer 5 on the other surface of the compressible layer 2. And a mold sheet 6.

The compressible layer 2 is a layer for providing the printing blanket 1 with resilience necessary for performing good printing, and is made of at least one of a double or multi-layer woven fabric, non-woven fabric and rubber sponge. Can be configured.

The double or multilayer fabric is a floating fabric having a structure in which a plurality of layers such as a satin fabric and a twill fabric are integrally woven by a weft (warp), and has a thickness of 0.1 to 0.1 mm.
It is about 0.8 mm. As specific examples of the double woven fabric and the multi-layer woven fabric, a four-strand five-sheet satin fabric, a three-strand four-sheet satin fabric, and the like can be used. In this case, the thickness of the weft is 10 to 25.
The number and the thickness of the warp are preferably about 30 to 40. Also,
The number of warp yarns per 25.4 mm is 70 to 10
It is preferable that the number of warp yarns per 0 mm and 25.4 mm is about 250 to 400. Such double or multi-layer woven fabrics can be those made using synthetic fibers.In this case, heat-fusing treatment is performed using the heat fusibility of the synthetic fibers to fix the weft and the warp. May be performed.

Further, as the nonwoven fabric, for example, a polyester nonwoven fabric having a thickness of about 0.1 to 0.5 mm can be used.

Further, as the rubber sponge, for example, nitrile butadiene rubber (NBR) having a thickness of about 0.1 to 0.5 mm, ethylene propylene non-conjugated diene rubber (E
PDM) can be used.

The rigidity providing layer 3 constituting the blanket 1
Is a layer for imparting waist strength (rigidity) for facilitating mounting work on a blanket cylinder, and is a polyester-based synthetic fiber cloth, a vinyl-based synthetic fiber cloth,
It consists of at least one of aramid fiber cloth and high density polyethylene fiber cloth. Examples of the polyester-based synthetic fiber cloth include Tetron (trade name) cloth, and examples of the vinyl-based synthetic fiber cloth include vinylon (trade name) cloth. As the aramid fiber cloth, Kevlar (trade name) cloth can be cited. The thickness of such a stiffness imparting layer 3 is preferably about 0.05 to 0.5 mm.

The stiffening layer 3 constituting the blanket 1 may have a Young's modulus in the range of 50 to 250 g / d, preferably in the range of 75 to 150 g / d. If the Young's modulus is less than 50 g / d, the shape stability of the blanket is poor, and it is difficult to attach the blanket to the blanket cylinder. May not be preferable.

Surface rubber layer 4 constituting blanket 1
Can be formed using a conventionally known blanket rubber material. Specifically, nitrile butadiene rubber (NBR), ethylene propylene non-conjugated diene rubber (EPDM), nitrile butadiene isoprene rubber (N
BIR), butadiene rubber (BR), and the like, or a mixture of two or more of these. The thickness of the surface rubber layer 4 can be set in a range of about 0.1 to 0.5 mm.

The adhesive layer 5 simplifies the operation of attaching a blanket to a small-diameter blanket cylinder unique to a business form printing machine, and includes a conventionally known acrylic (polybutyl acrylate, polydiethylhexyl acrylate, etc.) or the like. Is applied to a thickness of about 30 to 200 μm.

As the release sheet 6, a conventionally known release sheet, for example, a sheet obtained by subjecting a paper to a release treatment, a resin film having a release property with respect to an adhesive, or the like can be used.

The thickness of the blanket 1 from the surface rubber layer 4 to the compressible layer 2 is about 0.7 to 1.5 mm, preferably about 0.95 to 1.05 mm.

The blanket of the present invention as described above can be easily mounted on the blanket cylinder by the stiffness (rigidity) provided by the stiffness-imparting layer 3, and the compressible layer 2 Good printing becomes possible by the resilience given by (1).

When the blanket is mounted by mechanically fixing the end of the blanket in the groove of the blanket cylinder, the adhesive layer 5 and the release sheet 6 are not required.

[0026]

Next, the present invention will be described in more detail with reference to examples. Example 1 A satin woven fabric having a thickness of about 0.50 mm was prepared as a compressible layer, and a thickness of about 0.20 m was placed on the compressible layer.
m, a polyester-based synthetic fiber cloth having a Young's modulus of 100 g / d was laminated to form a rigidity-imparting layer. After that, a surface rubber layer (thickness 0.30 mm) made of NBR was formed on the rigidity-imparting layer.

Next, a release sheet having an adhesive layer made of polybutyl acrylate and having a thickness of 80 μm was attached to the other surface of the compressible layer to obtain a blanket as shown in FIG. (Example 2) A blanket was produced in the same manner as in Example 1 except that a polyester synthetic fiber cloth subjected to a heat fusion treatment (160 ° C, 1 minute) was used. (Example 3) Example 1 was repeated except that the rigidity-imparting layer was formed using a polyester synthetic fiber cloth having a Young's modulus of 55 g / d.
A blanket was produced in the same manner as described above. (Example 4) Polyester nonwoven fabric having a thickness of about 0.35 mm (H-821 manufactured by Japan Vilene Co., Ltd.) as a compressible layer
A blanket was produced in the same manner as in Example 1 except that 3) was used. (Example 5) NBR having a thickness of about 0.3 mm as a compressible layer
A blanket was prepared in the same manner as in Example 1 except that a rubber sponge was used. (Comparative Example 1) A blanket was produced in the same manner as in Example 1 except that a rigidity-imparting layer was formed using a cotton cloth having a Young's modulus of 30 g / d. Comparative Example 2 A blanket was prepared in the same manner as in Example 1 except that a compressible layer was formed using a plain-woven cotton cloth. (Comparative Example 3) A blanket was produced in the same manner as in Example 1 except that a satin woven fabric having a thickness of about 0.5 mm was used as a compressible layer, and no rigidity-imparting layer was formed.

Waist strength (rigidity) of each blanket (Examples 1 to 5 and Comparative Examples 1 to 3) produced as described above.
Was evaluated by the following feeling measurement, and the resilience was evaluated by the following measurement. The results are shown in Table 1 below.

Hand feeling measurement method A test piece of 3 × 15 cm is prepared, one end is fixed to the surface plate, and the other end is projected 13 cm horizontally from the surface plate, and a weight of 20 g is attached to the tip, and a test from a horizontal surface is performed. The bend angle of the piece is measured to determine the hand. The range of the hand that facilitates the work of attaching to the blanket cylinder is 30 to 50 ° with the release sheet, and 60 to 8 without the release sheet.
The range is 0 °.

Restorability measurement method A blanket was placed on a measuring table with the surface rubber layer facing upward, the compression area was 3.0 cm ² (circular anvil), the initial load was 3.0 kg, and the compression speed was 1.0 ± 0. At 0.1 mm / min (the final 0.005 mm compression rate is 0.3 mm / min), the blanket is compressed 0.10 mm with the initial load being 0, and the stress after a holding time of 1.0 second is measured. The resilience that enables good printing is that the stress is 50 to 70 (kgf / 3 cm).
² ) range.

[0031]

[Table 1] As shown in Table 1, the blanket of the present invention (Examples 1 to 5) has a feeling of 30 to 50 ° (with a release sheet) and 60 to 80 ° (without a release sheet). )
And the resilience is 50 to 70 (kgf / c
m ² ), it was confirmed that the work for mounting on the blanket cylinder was easy and good printing was possible.

On the other hand, a blanket (Comparative Example 1,
In 2), the stiffness (height of rigidity) provided by the rigidity-imparting layer was insufficient, and the workability of mounting on the blanket cylinder was low. In addition, blanket (comparative sample 3)
Had lower waist strength (rigidity), and had poor workability for mounting on a blanket cylinder.

[0033]

As described in detail above, according to the present invention, at least one of polyester-based synthetic fiber cloth, vinyl-based synthetic fiber cloth, aramid fiber cloth and high-density polyethylene fiber cloth is provided on one surface of the compressible layer. Blanket for printing by forming a stiffening layer composed of a seed, or forming a stiffening layer having a Young's modulus in the range of 50 to 250 g / d, and forming a surface rubber layer via the stiffening layer. Therefore, the work of attaching to the blanket cylinder becomes easy by the stiffness (height of rigidity) given by the stiffness-imparting layer, and good printing is achieved by the restorability given by the compressible layer. This makes it possible to exhibit excellent workability and printability when used in a business form printing press.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a printing blanket of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Blanket 2 ... Compressible layer 3 ... Stiffness imparting layer 4 ... Surface rubber layer 5 ... Adhesive layer 6 ... Release sheet

Claims (5)

[Claims] 1. A compressive layer having a surface rubber layer on one side of a compressive layer via a rigidity-imparting layer, wherein the rigidity-imparting layer is a polyester-based synthetic fiber cloth, a vinyl-based synthetic fiber cloth, an aramid fiber cloth, and a high-density polyethylene fiber. A printing blanket comprising at least one kind of cloth. 2. One surface of the compressible layer has a Young's modulus of 50 to 50.
A printing blanket comprising a surface rubber layer via a stiffening layer in the range of 250 g / d. 3. The printing blanket according to claim 1, wherein the rigidity-imparting layer has been subjected to a heat fusion treatment. 4. The compressible layer is a double or multilayer fabric,
The printing blanket according to any one of claims 1 to 3, comprising at least one of a nonwoven fabric and a rubber sponge. 5. The pressure-sensitive adhesive layer according to claim 1, further comprising an adhesive layer on the other surface of the compressible layer, and a release sheet on the adhesive layer.
A printing blanket according to any one of claims 1 to 4.