The relationship between the printing press and outlets

There are many factors that cause dot gain in printers, such as printing machine speed, wetting fluid, blankets, ink rollers, and so on. Printers generally believe that web printing is more extensive than web printing. The blanket is wrapped around the blanket cylinder and the image is received from the plate and transferred to the paper. There are two kinds of rubber blankets, traditional blankets and compressible blankets, and the latter produces clearer dots. Under pressure, the imprinting line of the blanket can be raised on one side or both sides. The imprinting line is the line of contact between the blanket cylinder and the impression cylinder. Traditional blankets do not have compressible properties. Under pressure, it is necessary to make every effort to restore the original shape and produce friction on the printing plate. This frictional effect not only shortens the service life of the printing plate, but it also causes such dot enlargement phenomenon called ghosting. Like a traditional leather cloth, the compressible blanket has a synthetic rubber surface layer and several layers of fiber backing.

In addition to several fiber layers, the backing also includes one or more layers such as foam, cork, or non-woven fibers, which will produce compression properties on the imprinting line. This design accommodates greater squeezing forces and improves ink transfer performance.

Due to the large lining range of the compressible blanket, the lining allows greater tolerances, which is important because improper pressure leads to excessive dot gain. Choosing the thinnest liner thickness required will control dot gain.

The effect of water and ink on dot gain can also be reflected on the offset press. The inking device not only applies ink to the printed image, but also can perform other functions such as ink distribution to improve the performance of the ink and to receive the dampening fluid. Emulsified with ink. The above factors will affect the expansion of outlets. The thicker the ink layer provided by the ink roller system, the more non-directional dots are expanded.

The wetting system applies a water-based wetting fluid to the printing plate, which functions to quickly and completely separate the image and non-image portions of the plate. The operator must maintain a balance between water supply and ink supply. Too much water may cause the viscosity of the ink to decrease, thereby increasing the dot gain.