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???Paperback notebook appears in the Qing Dynasty, the first is like the "Bible", "Code" and other books into China from the West.
????????The greatest feature of the notebook features paperback paperback cover of the notebook is sturdy, can be well protected inside pages. Generally the core wire needle lock, then strips of cloth attached to the core point together, strengthening the connection between the inner core and the envelope. Paperback notebook spine, generally divided into flat ridges and circular ridges. one. Flat back: for the shape of a flat cardboard liner II. Round ridge: suitable for leather lining etc. toughness is better.
