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according to the notebook ridge form points, a square notebook ridge and circular notebook ridge two.
A: square notebook ridge: its thickness than notebook core is thick some. As laptop core folding and locking wire reasons, notebook ridge height than notebook core, the more obvious the printed sheet. Therefore, square notebook ridge hardcover notebook shoulds not be too thick, generally applied in twenty mm less than notebook ridge.
B: circular notebook ridge: because the status of before and after the notebook for a slightly different, laptop for a folding place a semicircle, distribution in a cambered surface, its thickness are in equilibrium. Notebook core and flanging place and notebook ridge convex circle to adapt, concave round. So thicker diagram laptop using circular notebook ridge is better. Round ridge notebook is a paw round after processing back into circular arc, general with notebook core thickness for rotary and circular arc to show 130 degrees is advisable. Round ridge and can be divided into round back without ridge and round back have two ridge.