The cause of the torsional deformation of the blanket

During the imprinting process, if the surface of the blanket is subjected to different directions or forces of different sizes in different axial positions, the shape of the blanket will be torsionally deformed, resulting in graphic shape, ink transfer, overprinting, and blankets. The adverse effects of the service life etc. There are two main reasons for the torsional deformation of the blanket:

1. The axis of the drum is not parallel. Because when the center distance between the rollers is adjusted carelessly or because of the long-term use of the printing machine, the pressure regulator appears to be self-propelled, so that the center distance between the two ends of the roller is unequal, and it is possible to make the blanket cylinder relative to the impression cylinder or the plate cylinder. The axis is not parallel, the end of the blanket is subjected to a large squeezing force, and it is pushed forward. The other end is subjected to a small squeezing force, and the forward speed is slower, causing the blanket to twist.

2. The method of operation when the blanket is cut or mounted on the blanket plate is not standardized. When the blanket is cut, if the two sides of the clamping plate are not parallel, the tightness at different axial positions will be uneven when tightening, and the blanket will be tight on one side and the other side will be loose. The upper tensile stress is published unevenly and causes torsional deformation. When the blanket is mounted on the platen, if the depth of the blanket is different from the platen or the individual screws are not tightened when clamping the platen, when the blanket is tightened, a small amount of the rubber that has not been screwed out will cause the rubber to escape. The tension of the cloth at different positions in the axial direction is different, resulting in local torsional deformation.

When the blanket is cut, it is worth noting that the blanket should be parallel to the platen. The woven fabric of the blanket is formed by interweaving warp and weft threads. When subjected to the same tensile force, the elongation in the warp direction is far smaller than the elongation in the weft direction. When the blanket is stretched, the more it stretches, the more severe the thinning of the adhesive layer will result in the lower elasticity of the blanket and the more uneven the pressure. Generally, the base cloth of the blanket has a mark indicating the direction of tightening, and it can also be tried by hand. The person who does not easily stretch is the longitudinal direction and should be used as the direction of tightening, especially in the pair that will be scrapped due to hard damage. Or when full-length blanket is cut and used as 4 open blankets, attention should be paid to the directionality of warp and weft.

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