There are many factors that cause the dot expansion of the printing press, such as printing machine speed, dampening fluid, blanket, ink roller and so on. Printers generally believe that the dot expansion of web printing is greater than that of sheet printing. The blanket is wrapped around the blanket cylinder, receives the image from the printing plate, and then transfers it to the paper. There are two types of blankets, traditional blankets and compressible blankets, the latter produces clear dots. Under pressure, the impression line of the blanket will bulge on one or both sides. The impression line is the line of contact between the blanket cylinder and the impression cylinder. Traditional blankets are not compressible. Under pressure, we must try our best to restore the original shape and produce friction on the printing plate. This friction will not only shorten the service life of the printing plate, but also cause the phenomenon of network expansion called ghosting. Like the 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 compressive properties on the impression line. This design adapts to greater squeezing force and improves ink transfer performance.
Due to the large lining range of the compressible rubber cloth, the lining allows a large tolerance. In fact, this is very important, because improper pressure will cause too many dots to expand. Choosing the thinnest lining thickness required will control the expansion of the network.
The effect of water and ink volume on dot expansion can also be reflected on the offset printing machine. The inking device not only applies ink to the printed image, but can also perform other functions, such as ink leveling, to improve the performance of the activity and receive the dampening fluid. Emulsified with ink. The above factors will affect the network expansion. The thicker the ink layer provided by the ink roller system, the more non-directional dots expand.
The wetting system applies a water-based wetting fluid to the printing plate. Its function is to quickly and completely separate the image and non-image parts on the printing plate. The operator must maintain a balance between water supply and ink supply. Too much water supply may cause the viscosity of the ink to decrease, thereby increasing the degree of network expansion.
Desk controller basic software is a PC/MAC software reminding the user to use the office desk. Allows user to control height adjustment and pre-set individual optimal sit-stand table height. Pick your personal challenge for standing at your desk and improve your health and work habits over time.
Hand controller also has many functions, such as two memory controller, metric and inch switch, overheat / overload protection, anti colony feature, soft start / stop feature, child lock and so on. There are also many types of hand controllers to choose from to meet the different requirements of customers.
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