Book blocks for home binding
These are part made books, awaiting finishing. They are normally sewn. They are sometimes trimmed. They sometimes have the backs glued and taped. Invariably they require covers, and normally end paper. Plain books are suitable as journals or notebooks. Printed bookblocks are sometimes available as diaries, address books, or guest books.
Bookblocks are often claimed to "open flat", and they usually do open more easily unencumbered by the spine. This property may be lost on finishing ~ for example if a thick layer of backing glue is applied.