![]() ![]() The other dominant style of book binding built into copiers is perfect binding. Saddle stitching is a binding process that folds the media after it is imaged on both sides, stacks the printed folded sheets one inside the other, and applies staples to the spine of the book. Imposing page files for binding styles usually follows two types of machine capabilities: saddle stitching and perfect binding. This process is driven by imposing the single-page files in the correct order as they are processed in the RIP, so they image in the proper spot on the media to fold, and bind together in the correct order. More and more copiers have capabilities to fold and bind the finished product ‘inline’ in one continuous process. Using a ‘step and repeat’ or ‘duplexing’ imposition of single-page file is the simplest example of imposing files for electrophotographic workflows. Those efficiencies are the primary purpose of implementing imposition software. Making that management decision requires a knowledge of workflow options for efficiency. Management can determine how well the imaging engine run time is utilized and when it is efficient to have the same operator cut printed sheets in half. This introduces another process - cutting the sheets in half before final delivery. If run lengths of more than 100 copies were imposed two up on a tabloid sheet, it would halve the run time and open up more imaging time on the machine. For example, letter-size documents are the most often imaged on this type of equipment. There are simple rules of automation that can be programmed in a RIP to automatically impose if a run length is over 100 copies. Yet, as a manufacturing process, electrophotography is the slowest technology for image reproduction, and the most in need of saving time. Fewer will take the time to utilize the machine and media capabilities to step and repeat an image two up on a larger sheet to half the run time. Most small printers will turn on duplexing, rather than image the fronts, turn the printed paper over the right way, and image the back of the sheet. The duplexing style can be specified in the print driver, in the PDF file, or in the RIP. Duplexing is the simplest type of imposition, but there are four choices for how to orient the back of a single page on the front. ![]() Electrophotographic, or Xerox-type copiers are usually used for short-run lengths with demands for instant turnaround. The first technology we will look at is electrophotography, where imposition is perhaps the most underutilized. We will also look at ways of imposing in graphic creation software and in specialized imposition software. There are a few ways to impose the files either pre-RIP or post-RIP. There is also a range of equipment capabilities for each technology that affects how documents are imposed. We will discuss both priorities for each primary imaging technology we are examining in this book. The second is to add what has historically been referred to as ‘furniture’ to the manufactured sheet to control processes. The first, and perhaps most important purpose, is to utilize media and manufacturing equipment with the most economic efficiencies. Imposition of individual graphics page files serves two primary purposes. ![]()
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