The commercial rotary machine adopts the soft and soft design of the blanket cylinders as the impression cylinders. The paper transfers the ink under the rolling of the blanket cylinders. The expansion of the dots (mainly the expansion of the mechanical dots) is more important than the sheet-fed offset printing presses. Larger, in the process of multiple printing, for different papers, taking into account the mechanical and optical dot enlargement, using the X-Rite528 spectrodensitometer to measure the Heidelberg M-600's boot printing is normal, the print dot expansion Generally at 13% to 19%. When printing the plates used in commercial rotary machines, increase the exposure and expose small dots of 3% or less.
Mechanical dot gain is affected by many factors, such as ink, dampening solution, blanket, and paper surface properties. The main reason for the increase in optical dot size is that the refracted light increases the apparent area of ​​the dots. Because the enlargement of the dot area will have a certain impact on the gray scale of the printed matter and the balance of each color, the version of the commercial commercial rotary press can be lighter than the printing plate of the lithographic printing machine, and the exposure time is increased. In the case of 175 lines/inch, the FOGRAl 982 test strip has a continuous density of 13 steps and the third stage is emptied, and the yin and yang micron concentric coil segments 811m are aligned. If it is not 175 lines / inch, it should be adjusted according to the actual situation of each printing plant.
Article source address: http://
Honey Spoon,Honey Spoons For Tea,Jam Spoon,Stainless Steel Honey Dipper Stick
Jiangmen Xinhui Zhancha Metal Products Co,. Ltd. , https://www.zchardware.com