Glue is applied to the spine of the book – one edge of the book block – often roughened to improve grip. Glue can either be hot-melt or cold. If the book block is ground/scored this can result in the book block losing 1-3mm of its size along one edge. Polyurethane Reactive adhesive (PUR) binding is a popular method of binding paperback books. In addition to PUR, books can be bound by using lower cost EVA (hot-melt) glue. PUR adhesive is more flexible meaning the book can be opened flatter.
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