Printing rubber blanket

Abstract

A printing blanket is designed to have less sink-down, less variation in thickness along with time, less susceptible to temperature or moisture, and which employs woven fabric having excellent measurement stability, thereby having a sufficient durability against variation in thickness in high-speed printing. The printing rubber blanket includes a surface rubber layer, and at least two fabric layers, in which at least one of the fabric layers other than that located adjacent to the surface rubber layer is woven fabric made of a yarn of No. 10 count or less but No. 6 count or more used for warps of the woven fabric, and a yarn of No. 30 count or less but No. 20 count or more used for wefts of the woven fabric, and the woven fabric is subjected to a stretching process in which the woven fabric is expanded in the warp direction.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

FIG. 1 is a diagram showing a cross section of a part of a rubber blanket according to an embodiment of the present invention;

FIG. 2 is a diagram showing a cross section of a part of a rubber blanket according to the present invention, when it is placed on a cylinder;

FIG. 3 is a diagram showing a cross section of a part of a rubber blanket according to the conventional technique, when it is placed on a cylinder;

FIG. 4 is a diagram showing a cross section, in a woof direction, of a textile stuff of woven fabric used in a fabric layer of a rubber blanket according to the conventional technique;

FIG. 5 is a diagram showing a cross section, in a woof direction, of a textile stuff of woven fabric used in a fabric layer of the rubber blanket of the present invention;

FIG. 6 is a diagram showing a cross section, in a woof direction, of woven fabric used in the fabric layer of the rubber blanket of the present invention, which was stretched in its warp direction;

FIG. 7 is an explanatory diagram showing the woven fabric of the fabric layer of the rubber blanket while it is being calendered; and

FIG. 8 is a chart illustrating the relationship between the residual ductility (%) after the woven fabric is subjected to stretching and the tensile strength (kg) of the rubber blanket that employs the fabric layer of this woven fabric.

Claims

1. A printing rubber blanket comprising: a surface rubber layer;a compression layer provided below the surface rubber layer; andtwo or more fabric layers provided below the surface rubber layer;wherein at least one of the two or more fabric layers is woven fabric made of a yarn of No. 10 count or less but No. 6 count or more used for warps of the woven fabric, and a yarn of No. 30 count or less but No. 20 count or more used for wefts of the woven fabric, and the woven fabric is subjected to a stretching process in which the woven fabric is expanded in the warp direction.

2. A printing rubber blanket comprising: a surface rubber layer;a first fabric layer provided on a lower surface of the surface rubber layer;a compression layer provided on a lower surface of the first fabric layer; andone or more fabric layers provided on a lower surface of the compression layer;wherein at least one of the one or more fabric layers provided on the lower surface of the compression layer is woven fabric made of a yarn of No. 10 count or less but No. 6 count or more used for warps of the woven fabric, and a yarn of No. 30 count or less but No. 20 count or more used for wefts of the woven fabric, and the woven fabric is subjected to a stretching process in which the woven fabric is expanded in the warp direction.

3. The printing rubber blanket according to claim 1, wherein the number of warps of the woven fabric of the fabric layer subjected to the stretching process per 1 inch of textile stuff is 55 to 75 and the number of warps per 1 inch is 1.1 times or more than that of wefts.

4. The printing rubber blanket according to claim 1, wherein the woven fabric of the fabric layer subjected to the stretching process has a residual ductility of 3.5 to 6.5% after being stretched.

5. The printing rubber blanket according to claim 4, wherein the woven fabric of the fabric layer subjected to the stretching process employs a yarn of No. 9 count or less but No. 7 count or more used for warps, and a yarn of No. 30 count or less but No. 25 count or more used for wefts.

6. The printing rubber blanket according to claim 4, wherein either one of or both of warp and weft comprises one of cotton fiber, polynosic fiber, nylon fiber, polyester fiber, polyvinylalcohol fiber, polyolefin fiber, acryl fiber, rayon fiber and cotton cloth fiber, or a blended yarn of these fibers.

7. A printing rubber blanket comprising: a surface rubber layer;a compression layer provided on a lower surface of the surface rubber layer; andone or more fabric layers provided on a lower surface of the compression layer;wherein at least one of the one or more fabric layers is woven fabric made of a yarn of No. 10 count or less but No. 6 count or more used for warps of the woven fabric, and a yarn of No. 30 count or less but No. 20 count or more used for wefts of the woven fabric, and the woven fabric is subjected to a stretching process in which the woven fabric is expanded in the warp direction.

8. The printing rubber blanket according to claim 7, wherein the number of warps of the woven fabric of the fabric layer subjected to the stretching process per 1 inch of textile stuff is 55 to 75 and the number of warps per 1 inch is 1.1 times or more than that of wefts.

9. The printing rubber blanket according to claim 7, wherein the woven fabric of the fabric layer subjected to the stretching process has a residual ductility of 3.5 to 6.5% after being stretched.

10. The printing rubber blanket according to claim 7, wherein the woven fabric of the fabric layer subjected to the stretching process employs a yarn of No. 9 count or less but No. 7 count or more used for warps, and a yarn of No. 30 count or less but No. 25 count or more used for wefts.

11. The printing rubber blanket according to claim 7, wherein either one of or both of warp and weft comprises one of cotton fiber, polynosic fiber, nylon fiber, polyester fiber, polyvinylalcohol fiber, polyolefin fiber, acryl fiber, rayon fiber and cotton cloth fiber, or a blended yarn of these fibers.

12. The printing rubber blanket according to claim 2, wherein the number of warps of the woven fabric of the fabric layer subjected to the stretching process per 1 inch of textile stuff is 55 to 75 and the number of warps per 1 inch is 1.1 times or more than that of wefts.

13. The printing rubber blanket according to claim 2, wherein the woven fabric of the fabric layer subjected to the stretching process has a residual ductility of 3.5 to 6.5% after being stretched.

14. The printing rubber blanket according to claim 13, wherein the woven fabric of the fabric layer subjected to the stretching process employs a yarn of No. 9 count or less but No. 7 count or more used for warps, and a yarn of No. 30 count or less but No. 25 count or more used for wefts.

15. The printing rubber blanket according to claim 13, wherein either one of or both of warp and weft comprises one of cotton fiber, polynosic fiber, nylon fiber, polyester fiber, polyvinylalcohol fiber, polyolefin fiber, acryl fiber, rayon fiber and cotton cloth fiber, or a blended yarn of these fibers.