JPH06219078A - Printing blanket - Google Patents

Abstract

PURPOSE:To provide a good printing blanket which is capable of thinning reinforcing fabric without spoiling tensile strength of reinforcing fabric. CONSTITUTION:In a printing blanket wherein a compressed layer 52 is provided arbitrarily on the upper part of reinforcing fabric 54 and a surface layer 53 is laminated, the reinforcing layer is multi-layer textile 54. Since the multi-layer textile is used as the reinforcing fabric, it becomes possible that a strength manifesting layer (reinforcing layer) can be thinned, through which this blanket has an advantage that a quantity of expansion of a gap part becomes small.

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 an offset printing blanket having a small bulge in a gap when mounted on a blanket cylinder.

[0002]

BACKGROUND OF THE INVENTION An offset printing machine includes a plate cylinder 1 around which a plate as an original is wound, a blanket cylinder 2 rotating in conjunction with the plate cylinder 1 and the blanket cylinder 2 as shown in FIG. It basically comprises an impression cylinder 4 that holds the printing paper 3 under pressure. A printing blanket 5 is wound around the blanket cylinder 2.

Ink is adhered to the plate wound around the plate cylinder 1, the image formed by the ink is once transferred to the printing blanket 5 of the blanket cylinder 2, and the transfer image is brought into contact with the printing paper 3. Is to be printed on.

When the printing blanket 5 as described above is mounted on the blanket cylinder 2, as shown in FIG. 4, both ends of the printing blanket 5 are provided on the blanket cylinder 2 after the printing blanket 5 is wound around the blanket cylinder 2. It is adapted to be inserted into the mounting gap 21 and wound and mounted by the winding tool 6.

As shown in FIG. 5, a printing blanket 5 used in such a printing machine is generally made of an elastic material on a surface layer cloth 51 in which three to four cotton plain weave cloths are laminated with glue. The compression layer 52 is formed and the compression layer 5 is formed.
2 is further provided with a second reinforcing cloth 53, and then a rubber surface layer 54 is formed.

The surface layer fabric 51 obtained by laminating 3 to 4 plain weave fabrics and adhering to each other as described above has an advantage that it has good tensile strength, but since it becomes inevitably thick, the printing blanket 5 is attached to the blanket cylinder 2. When mounted, the gap 21 portion rises, and there is a drawback that problems such as double exposure of double dots due to shock generated at the time of printing and shock eyes in which the pattern of the surface layer fabric 51 is raised easily occur.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a good printing blanket capable of thinning a reinforcing cloth without impairing the tensile strength of the reinforcing cloth. .

[0008]

In order to solve the above-mentioned problems, the printing blanket according to the present invention is a printing blanket in which a compression layer is optionally provided on the upper part of a reinforcing cloth, and a surface layer is laminated. The reinforcing cloth is a multi-layered woven fabric.

According to the present invention, since the multi-layer woven fabric is used as the reinforcing fabric, it is not necessary to stack a plurality of plain weave fabrics, and it is possible to maintain sufficient tensile strength even with one layer. Therefore, it is possible to reduce the thickness of the printing blanket as a whole, which brings about an advantage that swelling in the gap portion can be suppressed to a minimum.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in more detail.

FIG. 1 is a partial cross-sectional view of an example of the structure according to the present invention. As is apparent from this figure, the printing blanket according to the present invention has a multilayered reinforcing cloth 54 and a compression layer 52.
And the surface layer 53 is formed after the ordinary surface layer cloth 51 is further provided. The multilayer fabric is a fabric having a structure in which a plurality of layers are integrally woven by warp yarns (warps).

FIG. 2 is a development view of the structure showing an example of the multi-layered woven fabric according to the present invention, which has a satin weave structure, but various weaves such as twill weave can be adopted. In FIG. 2, the pattern that appears in the longitudinal direction on the surface of the multi-layer woven fabric of wefts 8 is shown in black. As is clear from this figure, in this structural example, the multilayer fabric is a satin weave having a two-layer structure. That is, as shown in FIGS. 1 and 2, two layers of warp yarns 7, 7 and wefts 8 are formed in one unit, and the weft yarns 8 are woven so as to integrate the two layers of warp yarns 7, 7. It has a different structure. In this example, when looking at the third warp thread 81 from the right, for example, the warp thread 8 is woven from below at the lower side of the cloth in the first step, and the warp thread 8 is at the outermost surface of the cloth at the second step and downward at the third step. After appearing on the outermost surface in the 4th step, 5,
In the 6th and 7th layers, the lower part of the cloth, the 8th layer is the outermost surface, the 9th layer is the lower surface, the 10th layer is the outermost surface, the 11th layer is lower, the 12th layer is the outermost surface, and the 13th layer is lower. After going down, 14, 15,
It is woven so that it can be seen on the outermost surface at the 16th step.

The thickness of such a weft yarn 8 is preferably 2
The number is preferably 0 to 60, and it is preferable to twist 1 to 4 of these yarns into warp yarns. If the thickness of the yarn is less than 60, there is a possibility of causing a problem in strength, while if it exceeds 20, there is a possibility that the weave becomes large and the reinforcing cloth becomes thick.

On the other hand, the thickness of the warp yarn 7 is preferably 20 to
No. 60, and the number of twists is preferably 1 to 4. If the thickness of the yarn is less than 60, there is a possibility of causing a problem in strength, while if it exceeds 20, there is a possibility that the weave becomes large and the reinforcing cloth becomes thick.

The number of warp threads 8 per 2.54 cm is preferably 60 to 200. If the number is less than 60, the weaving becomes rough and the strength is insufficient.

Further, the number of the warp yarns 7 per 2.54 cm is preferably 60 to 200. If the number is less than 60, the weaving becomes rough and the strength is insufficient.

[0017]

【Example】

A printing blanket as shown in FIG.
It was manufactured using the multilayer fabric shown in FIG.

The structure of the multilayer fabric was as follows:

Warp yarn ・ ・ ・ Three 45th twisted warp ・ ・ ・ 30th 1 warp number ・ ・ ・ 84 / 2.54cm Warp number ・ ・ ・ 84 ・ 2.54cm

As a result of the tensile test of this multilayer fabric,
The tensile strength was 7750 kg / m and the elongation was 17%. This corresponds to the strength of two to three conventional plain-woven fabrics. This was stretched and stretched to 4% to obtain a reinforcing cloth 54.

After laminating a compression layer on one piece of this reinforcing cloth,
One conventional plain weave reinforcing cloth was laminated, and finally a surface layer was formed to obtain a printing blanket.

The printing blanket as described above was placed on a printing machine and the swelling of the gap was measured.
It was 1 mm, and the amount of expansion could be significantly reduced as compared with the conventional printing blanket.

[0024]

As is apparent from the above description, according to the printing blanket of the present invention, since the multilayer fabric is used as the reinforcing cloth, the strength developing layer (reinforcing layer) of the printing blanket is thinned. Therefore, there is an advantage that the amount of expansion of the gap portion is reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a configuration example of the present invention.

FIG. 2 is a structural development view of an example of a multi-layer fabric.

FIG. 3 is an explanatory diagram of a printing machine.

FIG. 4 is a partial cross-sectional view of a conventional printing blanket.

FIG. 5 is a conceptual diagram of a method of mounting a printing blanket on a blanket cylinder.

[Explanation of symbols]

 2 blanket cylinder 21 gap part 5 blanket 51 for printing 51 surface cloth 52 compression layer 53 surface layer 54 multilayer woven fabric reinforcing cloth layer

[Procedure amendment]

[Submission date] March 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

FIG. 1 is a partial cross-sectional view of an example of the structure according to the present invention. As is apparent from this figure, the printing blanket according to the present invention has a multilayered reinforcing cloth 54 and a compression layer 52.
And the surface layer 53 is formed after the ordinary surface layer cloth 51 is further provided. A multi-layer woven fabric is a woven fabric having a structure in which a plurality of layers are integrally woven by warp yarns ( weft yarns).

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

FIG. 2 is a development view of the structure showing an example of the multi-layered woven fabric according to the present invention, which has a satin weave structure, but various weaves such as twill weave can be adopted. In FIG. 2, a pattern in which the warp yarns 8 appear on the surface of the multilayer fabric in the longitudinal direction is shown in black. As is clear from this figure, in this structural example, the multilayer fabric is a satin weave having a two-layer structure. That is, as shown in FIGS. 1 and 2, two layers of weft yarns 7, 7 and warp yarns 8 are formed in one unit, and the warp yarns 8 integrate the two layers of weft yarns 7, 7. It has a woven structure. In this example, for example, looking at the third warp yarn 81 from the right, the warp yarn 8 is woven from the lower side to the lower side of the cloth in the first stage, and
On the outermost surface of the cloth at the 3rd step, downward at the 3rd step, at the 4th step to the outermost surface, then at the bottom of the cloth at the 5th, 6th, 7th steps, at the 8th step to the outermost surface Weave to go downward with the 10th step, uppermost with the 11th step, lower with the 12th step, lower with the 13th step, and then to the outermost surface with the 14th, 15th and 16th steps. Has been.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The thickness of such warp yarns 8 is preferably 20 to 60, and it is preferable to twist 1 to 4 of these yarns into warp yarns. If the thickness of the yarn is less than 60, there is a possibility of causing a problem in strength, while if it exceeds 20, there is a possibility that the weave becomes large and the reinforcing cloth becomes thick.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

On the other hand, the thickness of the weft thread 7 is preferably 20
No. 60 to 60, and the number of twists is preferably 1 to 4. If the thickness of the yarn is less than 60, there is a possibility of causing a problem in strength, while if it exceeds 20, there is a possibility that the weave becomes large and the reinforcing cloth becomes thick.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

The number of warp threads 8 per 2.54 cm is preferably 60 to 200. If the number is less than 60, the weaving becomes rough and the strength is insufficient.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Further, the number of the weft threads 7 per 2.54 cm is preferably 60 to 200. If the number is less than 60, the weaving becomes rough and the strength is insufficient.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

Warp yarn ・ ・ ・ Three 45th strands Weft yarn ・ ・ ・ 30th 1 yarn Vertical yarn driving number ・ ・ ・ 84 / 2.54cm Horizontal yarn driving number ・ ・ ・ 84/2 .54 cm

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Claims] 1. A compression layer is optionally provided on the upper part of the reinforcing cloth,
A printing blanket in which a surface layer is laminated, wherein the reinforcing cloth is a multi-layer woven fabric.