How to make the most efficient use of paper?
The digital layout is an important process in the printing production process. It is based on the requirements of printing and post-press processing, and the pages are arranged reasonably on the layout to achieve the most efficient use of paper.
Digital workflow version of the regular workflow
Currently, the mainstream imposition software on the market includes Heidelberg Prinect Signa Station, Kodak Preps, DynaStrip, Founder Wenhe, Fuxin Yintong and so on.
The steps of using these software are basically the same, including several steps: check→minute→build→input→out→fold.
The main difference between rotary imposition and single imposition
Since the structure of the printing machine, the printing method, the folding method, and the like of the commercial rotary printing are different from the single-sheet printing, the layout of the elements of the page on the large version is also greatly different from that of the single-sheet printing machine.
At present, most commercial rotary presses are equipped with automatic plate loading, automatic color registration, automatic cutting and correction, density online measurement and other devices to improve the degree of automation. Therefore, in order to achieve these high automation functions, it is necessary to The elements are reasonably selected and laid out.
1. Cutting size
Due to the limitation of the circumference of the cutting drum and the width of the door, the opening size of the rotary machine has certain limitations. At present, the web widths commonly used by commercial wheels are 546mm, 578mm, 610mm, etc., and the width of the web used. Less than or equal to the width of the door.
Relatively speaking, the sheet-fed printing press is much more flexible. It can choose not only the split, four open, eight open, etc. In special cases, it can also be opened and opened (that is, the full-open paper is opened one big one. Small size), and when the papers of different products are the same, you can also flexibly choose the offset printing, as long as the plate is between the maximum paper size and the minimum paper size.
2. Automatic registration mark
The automatic registration mode of the rotary printing machine is to obtain the measurement data by scanning the registration mark on the printing plate by the positioning detection system, compare the measurement data with the data of the standard proof, and perform the axial and circumferential adjustment of the corresponding roller by using the difference value; The sheet-fed press completes the positioning of the paper by the front gauge and the side gauge, then extracts the proof, then observes the registration mark under the magnifying glass, and manually adjusts the axial and circumferential directions of the drum to ensure the accuracy of the overprint. Figure 1 shows the automatic registration mark of the rotary machine and the registration mark of the sheet-fed printing press.
3. Folding order
The rotary machine has a line automatic folding function. When the scanning device of the rotary cutting drum recognizes the automatic cutting mark, the cutting knife is driven to complete the cutting, and the repetitive work of the cutting roller is to roll the paper. The sheet is cut into a single sheet of paper, and the sheet of paper is finished by the folding device, and the folding operation of the sheet is completed by the folding machine after the printing is completed.
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