The printing principle of web offset presses and the basic offset presses are basically the same. However, due to the very high printing speed of the rotary press, printing on the front and back, and the automatic folding device, the volume of an 8-color commercial rotary press is very large. Of course, its printing efficiency is also very high. Roughly, the output of a rotary machine is equivalent to seven or eight flat-sheet four-color offset presses.
Here are a few features of the rotary machine:
l. Commercial web presses use roll paper, which is suitable for thin paper with a paper thickness of 105 g or less.
2. The printing speed of the rotary machine is very high, with an average speed of 50,000 sheets per hour, while the general flat-sheet offset press has a printing speed of 10,000 or less. In addition, the web printing machine prints both sides of the web at the same time, and the flat-sheet machine prints one side, and after the ink is substantially dried, the printing is reversed.
3, the wonderful thing about the rotary machine is that the printed sheets are quickly dried and disconnected after printing, and the pages are folded directly according to different binding methods.
4. Rotary machines are suitable for prints with large numbers of prints and short delivery times, such as magazines, supermarket discount books, etc.
Rotary printers vary in structure depending on the substrate, and their prices are quite different. There are specialized printed newspapers, special printed stickers, printed documents, etc., and our company's rotary machines belong to high-end commercial rotary machines (model is Heidelberg M600-C24), and are printing four colors at the same time. Specially printed high-end journals can also print color inserts of color textbooks and newspapers.
Printing knowledge:
How to overcome the printing pressure and increase the mechanical dot gain
In the printing process, the transfer of the ink and the transfer of the print require proper printing pressure, and the deformation of the web and the deformation of the blanket are bound to cause deformation and increase of the dots. Therefore, in the process of drying the PS plate, it is necessary to combine different models (different printing presses have different dot gain values) to select an appropriate exposure time so that the dots on the PS plate are slightly smaller than the sample drafts, and the printed matter can be kept consistent with the proofs. .
Here are a few features of the rotary machine:
l. Commercial web presses use roll paper, which is suitable for thin paper with a paper thickness of 105 g or less.
2. The printing speed of the rotary machine is very high, with an average speed of 50,000 sheets per hour, while the general flat-sheet offset press has a printing speed of 10,000 or less. In addition, the web printing machine prints both sides of the web at the same time, and the flat-sheet machine prints one side, and after the ink is substantially dried, the printing is reversed.
3, the wonderful thing about the rotary machine is that the printed sheets are quickly dried and disconnected after printing, and the pages are folded directly according to different binding methods.
4. Rotary machines are suitable for prints with large numbers of prints and short delivery times, such as magazines, supermarket discount books, etc.
Rotary printers vary in structure depending on the substrate, and their prices are quite different. There are specialized printed newspapers, special printed stickers, printed documents, etc., and our company's rotary machines belong to high-end commercial rotary machines (model is Heidelberg M600-C24), and are printing four colors at the same time. Specially printed high-end journals can also print color inserts of color textbooks and newspapers.
Printing knowledge:
How to overcome the printing pressure and increase the mechanical dot gain
In the printing process, the transfer of the ink and the transfer of the print require proper printing pressure, and the deformation of the web and the deformation of the blanket are bound to cause deformation and increase of the dots. Therefore, in the process of drying the PS plate, it is necessary to combine different models (different printing presses have different dot gain values) to select an appropriate exposure time so that the dots on the PS plate are slightly smaller than the sample drafts, and the printed matter can be kept consistent with the proofs. .
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