JP2001260562A - Cloth for printing blanket, and printing blanket using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a market with a printing blanket prevented from slipping in relation to a blanket roller under the pressure applied in printing, in view of the problem that the blanket formed of the cloth using threads twisted in a specified direction slips in the specified direction under the pressure. SOLUTION: Threads 10 and 11 constituting warp and weft of woven fabric are twisted alternately in reverse directions Z and S respectively, and the cloth for the printing blanket is woven in plain fabric from the threads arranged in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blanket fabric which is used by being wound around a blanket roller of a printing machine, mainly an offset printing machine, and a blanket manufactured using the blanket fabric.

[0002]

2. Description of the Related Art Conventionally, a spun yarn is generally twisted in a specific direction, and the twisting direction is called an S direction and a Z direction, respectively. Thus, any one of the spinning companies is employed and sold.

[0003] Conventional blanket fabrics are woven with one of the above-mentioned yarns, either S-twisted or Z-twisted, and use fine-count yarn from thick-count yarn. A blanket is formed by laminating up to a woven fabric using rubber or an elastic synthetic resin material as a binder, laminating a woven fabric made of fine count yarn on the surface, and polishing and smoothing the surface rubberized surface.

Further, this type of printing has a large number of printing copies, usually 50,000 copies or 100,000 copies, and if the number of times of compression received during printing is repeatedly received, the intermediate portion in the circumferential direction of the blanket will become the axial direction of the blanket roller. The printing surface of the plate cylinder and the sheet feeding position are shifted from each other in a width direction by 0.5 to 2 cm in severe cases, resulting in poor printing. In addition, in multicolor printing, the blanket of each blanket roll in one time has a deviation size in the axial direction which is not constant,
There is a disadvantage that a slight printing shift occurs.

Conventionally, this type of blanket is deformed or displaced as an inevitable part of the blanket itself. When the blanket is mounted on the blanket roller, the blanket is constantly tensioned to minimize the amount of deformation or movement. I was trying to do it. However, paying attention to the blanket fabric itself, the investigation of the cause that the deformation direction due to the pressure is accompanied by the twist direction of the yarn has not been looked at at all, and the above-mentioned mounting method or structure or the smoothness of the surface has not been looked at at all. Attention was paid only to the improvement and the improvement of the elastic layer.

The present inventors have found that the above-described displacement of the blanket with respect to the blanket roller is caused by the twist direction of the twisted yarn constituting the woven fabric.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention
Even if pressure is applied to one woven fabric in the surface direction, the twisting of the individual yarns is offset by each other, and a blanket fabric that does not move in a specific direction as a single woven fabric and a fabric used for these materials. The purpose is to provide the manufactured blanket to the market.

[0008]

In order to achieve the above-mentioned object, the present invention relates to a woven fabric, in which at least every other warp yarn among the weft yarns is arranged in a twisted direction. A printing blanket fabric characterized by being woven.

In order to achieve the above-mentioned object, the printing blanket fabric is characterized in that every other weft yarn of the woven fabric is arranged and woven so that the twist direction is reversed. It is preferable that

According to another aspect of the present invention, a blanket fabric according to any one of claims 1 and 2 is a fabric made of a thick yarn on the blanket roller side, and the front surface is With a fabric made of fine yarn,
The intermediate layer is a fabric of a middle count between the front and back layers, and as the fabric gradually becomes finer from the blanket roller side to the surface side, these are formed by laminating rubber, a kind of elastic material of elastic synthetic resin as a binder, A printing blanket with a smooth surface.

According to the first and third aspects of the present invention, yarns in the warp (warp) direction have different twisting directions every other yarn. That is, yarns in the Z direction and the S direction are arranged and woven. Fabric. Using a blanket manufactured by appropriately stacking blanket fabrics made of such a fabric, winding it around a blanket roller of an offset printing machine, and fixing the blanket, the respective yarns are pressed by a printing plate roller or a backup roller. Attempts to roll around the longitudinal axis of each yarn, with the twisting direction completely opposite. However, since the rolling is performed in the opposite direction every other line, the movements thereof are canceled each other, and the fabric as a whole does not move in any width direction.

In the circumferential direction of the blanket, when all the weft (weft) yarns are in the same direction, the blanket is slightly shifted in the circumferential direction due to the above-mentioned contact pressure. Is discontinuously mounted at a part of the roller, the mating roller separates each time it passes through the discontinuous portion, and the circumferential displacement of the blanket releases the pressing force every rotation. State, and the blanket returns in the circumferential direction once every time, and the above-mentioned shift is not accumulated.

In the second and third aspects of the present invention, since the blanket fabric is configured as described above, the blanket fabric is not affected by the pressure caused by the printing plate roller and the backup roller both in the width direction and the circumferential direction of the blanket. The blanket does not shift.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an embodiment of the present invention.
In the figure, 10 is a warp, and every other thread is 2 to 6
This is a plain weave fabric A in which main twisted Z twisted yarns 10a and S twisted yarns 10b are arranged. Numeral 11 denotes a weft, which is made of the same S-twisted or Z-twisted yarn. In the fabric A used for the blanket roller 15 side, the total count of each yarn is:
Number of shots between counts 10 to 25 and 24.5 mm is 55
A total number of 30 to 40, and a number of implants of 100 to 120 between 24.5 mm are used for the surface, and an intermediate layer having an intermediate number and number of implants is used as the intermediate layer. As each yarn, a cotton yarn such as an Egyptian comb yarn or an American comb yarn, a chemical fiber such as rayon, nylon, or polyester, or a blend yarn of these and cotton is generally used. Further, a long fiber may be used, or a twisted yarn combining this with a short fiber may be used. These materials are merely examples, and even if the yarn used in the present invention is applied to a yarn made of all fibers conventionally used as a bracket, it is included in the embodiment of the present invention.

Second Embodiment FIG. 2 shows the second embodiment of the present invention. The difference from the first embodiment is that the weft 11 also
Other than the Z twisted yarn 11a and the S twisted yarn 11b every other wire, there is no difference from the first embodiment.

Third Embodiment A blanket B using the fabric A of the second embodiment,
This is an embodiment of the invention described in claim 3. As the blanket B, the side in contact with the blanket roller 15 is a plain woven base layer fabric A1 composed of strong thick-count weft yarns 10 and 11, one or two of which are laminated, and a rubber, an elastic synthetic resin material (for example, silicone rubber and Using a mixture of NBR) as a binder, the fabric of the intermediate layer fabric A2 of the fine weft is gradually layered, and the surface fabric A3 of the fine count is laminated, and the surface is further thinly made of the rubber or elastic synthetic resin. Is formed and the surface is smoothed. Surface layer 1
2 is to select a material excellent in the transferability of printing ink, oil resistance and the like. If necessary, a fine satin state may be formed on the surface. An intermediate elastic layer 13 formed of the binder is formed between the respective layers. The thickness of the bracket B as a whole is from 1.65 to 2.
It is 5 mm.

[0017]

According to the first aspect of the present invention, the blanket according to the third aspect can be manufactured, and the blanket does not shift in the width direction (axial direction) of the blanket roller even by pressure during printing. Can be manufactured. In the invention according to claim 2, the blanket according to claim 3 can be similarly manufactured, and a blanket in which the blanket width and the rotation direction do not shift even by pressure during printing can be manufactured. .

According to the third aspect of the invention using the cloth A according to the first aspect, when the cloth A is used by being wound around a blanket roller, it does not shift in the width direction even by the pressure applied during printing. In the case of a blanket wrapped around several blanket rollers, there is almost no displacement in the circumferential direction, and the displacement in the width direction is almost equal, and the displacement in the circumferential direction is almost fixed by the tension when the blanket is wound. In multicolor printing using blanket,
There is no mutual displacement between the blankets of the different blanket rollers and no printing displacement occurs. Further, in the blanket of the invention according to the third aspect using the cloth according to the second aspect, there is no displacement in the width direction and the circumferential direction of the blanket due to the pressure at the time of printing. No color shift occurs, especially in multicolor color photographs, and clearer printing can be achieved. In particular, even if the blanket according to claim 3 is wound around a blanket roller and operated continuously for a long time, there is no shift in the width direction, no shift between the plate cylinder and the feeding position, and the conventional blanket is used. There is no need to frequently rewind the blanket or use special adhesives.

[Brief description of the drawings]

FIG. 1 is an enlarged horizontal plan view of a first embodiment.

FIG. 2 is an enlarged horizontal plan view of a second embodiment.

FIG. 3 is a partially broken enlarged perspective view of a third embodiment.

FIG. 4 is a schematic side view showing a state where a blanket is attached to a blanket roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Warp 10a Z twist warp 10b S twist warp 11 weft 11a Z twist weft 11b S twist weft A Cloth A1 Base cloth A2 Intermediate cloth A3 Surface cloth 12 Surface layer 13 Intermediate elastic layer 15 Blanket roller B Blanket

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takahiro Yamamoto 6-22-1-701 Higashihongo, Midori-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 2H114 CA03 CA04 CA10 EA08 4F100 AJ02 AK42 AK46 BA03 BA07 BA10A BA10C BA25 DG01 DG11A DG11B DG11C DG18 GB51 JK07G JK15A 4L048 AB12 DA35 DA38

Claims (3)

[Claims] 1. A printing blanket fabric, wherein at least every other warp yarn among the weft yarns is arranged and woven by arranging yarns having opposite twisting directions. 2. A printing blanket fabric characterized by arranging and weaving alternately twisted yarns in every other weft yarn of the woven fabric. 3. The blanket fabric according to claim 1, wherein the blanket roller side surface is a fabric made of a thick yarn, and the surface side is a fabric made of a fine yarn. , A fabric with a middle count between the front and back layers, and gradually becoming finer fabric from the blanket roller side to the surface side, these are laminated with rubber, one kind of elastic material of elastic synthetic resin as a binder, and the surface is smoothed. Printing blanket.