The mull is a strip of cloth that is attached to the back of the sewn signatures and the tapes, and is also affixed to the cover boards with tapes. Cut a piece of cloth in a size that can conceal the top and bottom kettlestitches along with the tapes in between them; make sure that your chosen length is at least three inches wider than the back of the signatures so that it can be extended onto both sides.
Following on from the previous chapter on folding the sheets, collating is the process of inspecting and ensuring that all the parts of a book are complete and arranged in their proper order. Once this has been verified, the signatures can be sewn together. For blank books, collating plays no role. However, in all other cases, this step is very important. If you mark your signatures properly you can easily get this done. Continue reading →