Sewing on Tapes Signatures can be hand sewn through the fold onto cloth tapes. The tapes link the signatures, one to another, across the spine. The shoulder is formed when a text block is backed. During this process the outermost leaves on each side of the text block are bent outward at a 45 degree angle along the binding edge, to accommodate the boards and to allow them to hinge freely. The ridge that is thus formed on either side of the spine is the shoulder.
Signatures are commonly eight, sixteen or thirty-two pages.as a group.
One issue of The New Library Scene is a signature. It is the part of a bound text block between the two cover boards on which the lettering appears. A stamplettering pattern refers to the arrangement of letters, numbers, and punctuation on the spine of a case. The color of stamping foil is also part of the stamplettering pattern. Squares The edges of the case that extend beyond the text block at the head, tail, and fore edge, and protect it.