Limp Vellum Binding medieval style books
Limp binding is a bookbinding method in which the book has flexible cloth, leather, vellum, or (rarely) paper sides. When the sides of the book are made of vellum, the bookbinding method is also known as limp vellum. The cover is made with a single piece of vellum or alternative material, folded around the textblock, the front and back covers being folded double. The quires are sewn onto sewing supports such as cords or alum-tawed thongs and the tips of the sewing supports would be laced into the cover. The thongs could also be used at the fore edge of the covers to create a closure or tie. In limp binding the covering material is not stiffened by thick boards, although paste-downs, if used, provide some stiffness; some limp bindings are only adhered to the back of the book. Some limp vellum bindings had yapp edges that flop over to protect the textblock.