Types of bindings – variant B of the program
Perfect binding • sheet next to sheet
The sheets after folding are put horizontal NEXT TO each other (SNS). There is no common back, each sheet has its own - together they form a surface that allows the cover to be glued. The pages of the document being impositioned are placed on the sheets in sequence - the first on the first, the last on the last sheet. This method of folding makes it possible to make a one-sheet composite insert (e.g. for a glued binding).
The folded sheets can be collected by machine or by hand. Optical control of the correct order of gatherings is provided by the collation signature.
Saddle stitching • sheet into sheet
Sheets after folding are put together one into the other (SIS). There is a common back. The pages of the document are arranged in such a way that on subsequent sheets pages are placed at the same distance from the beginning and from the end of the cover. This method of folding enables one-component multi-sheet inserts (e.g. for saddle stitching, most often sewn with wire staples).
In some printers, such impositioned sheets cut into individual "4-Pages", which in turn collects and sews a device called a "collator".
Sewn binding (x sheets in the gathering)
A combination of both (STS and SIS) ways of folding sheets enables multi-component multi-sheet insert (e.g. for sewn binding, i.e. consisting of gluing (or sewing) previously stitched (usually with threads) gatherings).
In the Impozycjoner program, the number of sheets in the gathering can be adjusted in the range from 1 to 8. On the first sheets in each gathering you can also draw the collation mark.
If the number of sheets is such that there is uncomplete gathering (consisting of a smaller number of whole press sheets or from whole and half press sheets or only from half press sheets), then such a gathering is the penultimate premium in the block by default. The location of an uncomplete gathering in a book block can be changed.
Perfect binding and sewn binding of one sheet gathering - comparison
The final effect of both types of bindings is similar, but the difference between them consists in folding sheets incomplete: in the glued binding they are laid side by side (SNS), and in a sewn binding: put one into the other (if there are more than one).