A piece of paper tape belongs to the exterior decoration. The waist seal is usually made of strong paper.
Its height is generally equivalent to one-third of the height of a book, but it can be larger; The width should not only reach the front cover, spine and back cover, but also reach a neckline on each side. The waist seal can be printed with promotional words related to the book. The main function of waist seal is to decorate the cover or supplement the lack of cover performance. Generally used in hardcover books.